diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-08 11:31:16 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-08 11:31:16 -0700 |
| commit | 3f17ea6dea8ba5668873afa54628a91aaa3fb1c0 (patch) | |
| tree | afbeb2accd4c2199ddd705ae943995b143a0af02 /kernel | |
| parent | 1860e379875dfe7271c649058aeddffe5afd9d0d (diff) | |
| parent | 1a5700bc2d10cd379a795fd2bb377a190af5acd4 (diff) | |
Merge branch 'next' (accumulated 3.16 merge window patches) into master
Now that 3.15 is released, this merges the 'next' branch into 'master',
bringing us to the normal situation where my 'master' branch is the
merge window.
* accumulated work in next: (6809 commits)
ufs: sb mutex merge + mutex_destroy
powerpc: update comments for generic idle conversion
cris: update comments for generic idle conversion
idle: remove cpu_idle() forward declarations
nbd: zero from and len fields in NBD_CMD_DISCONNECT.
mm: convert some level-less printks to pr_*
MAINTAINERS: adi-buildroot-devel is moderated
MAINTAINERS: add linux-api for review of API/ABI changes
mm/kmemleak-test.c: use pr_fmt for logging
fs/dlm/debug_fs.c: replace seq_printf by seq_puts
fs/dlm/lockspace.c: convert simple_str to kstr
fs/dlm/config.c: convert simple_str to kstr
mm: mark remap_file_pages() syscall as deprecated
mm: memcontrol: remove unnecessary memcg argument from soft limit functions
mm: memcontrol: clean up memcg zoneinfo lookup
mm/memblock.c: call kmemleak directly from memblock_(alloc|free)
mm/mempool.c: update the kmemleak stack trace for mempool allocations
lib/radix-tree.c: update the kmemleak stack trace for radix tree allocations
mm: introduce kmemleak_update_trace()
mm/kmemleak.c: use %u to print ->checksum
...
Diffstat (limited to 'kernel')
79 files changed, 2130 insertions, 1274 deletions
diff --git a/kernel/acct.c b/kernel/acct.c index 8d6e145138bb..808a86ff229d 100644 --- a/kernel/acct.c +++ b/kernel/acct.c @@ -55,7 +55,7 @@ #include <linux/times.h> #include <linux/syscalls.h> #include <linux/mount.h> -#include <asm/uaccess.h> +#include <linux/uaccess.h> #include <asm/div64.h> #include <linux/blkdev.h> /* sector_div */ #include <linux/pid_namespace.h> @@ -134,7 +134,7 @@ static int check_free_space(struct bsd_acct_struct *acct, struct file *file) spin_lock(&acct_lock); if (file != acct->file) { if (act) - res = act>0; + res = act > 0; goto out; } @@ -262,7 +262,7 @@ SYSCALL_DEFINE1(acct, const char __user *, name) if (name) { struct filename *tmp = getname(name); if (IS_ERR(tmp)) - return (PTR_ERR(tmp)); + return PTR_ERR(tmp); error = acct_on(tmp); putname(tmp); } else { diff --git a/kernel/audit.c b/kernel/audit.c index 47845c57eb19..f30106459a32 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -44,7 +44,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/init.h> -#include <asm/types.h> +#include <linux/types.h> #include <linux/atomic.h> #include <linux/mm.h> #include <linux/export.h> diff --git a/kernel/backtracetest.c b/kernel/backtracetest.c index a5e026bc45c4..1323360d90e3 100644 --- a/kernel/backtracetest.c +++ b/kernel/backtracetest.c @@ -19,8 +19,8 @@ static void backtrace_test_normal(void) { - printk("Testing a backtrace from process context.\n"); - printk("The following trace is a kernel self test and not a bug!\n"); + pr_info("Testing a backtrace from process context.\n"); + pr_info("The following trace is a kernel self test and not a bug!\n"); dump_stack(); } @@ -37,8 +37,8 @@ static DECLARE_TASKLET(backtrace_tasklet, &backtrace_test_irq_callback, 0); static void backtrace_test_irq(void) { - printk("Testing a backtrace from irq context.\n"); - printk("The following trace is a kernel self test and not a bug!\n"); + pr_info("Testing a backtrace from irq context.\n"); + pr_info("The following trace is a kernel self test and not a bug!\n"); init_completion(&backtrace_work); tasklet_schedule(&backtrace_tasklet); @@ -51,8 +51,8 @@ static void backtrace_test_saved(void) struct stack_trace trace; unsigned long entries[8]; - printk("Testing a saved backtrace.\n"); - printk("The following trace is a kernel self test and not a bug!\n"); + pr_info("Testing a saved backtrace.\n"); + pr_info("The following trace is a kernel self test and not a bug!\n"); trace.nr_entries = 0; trace.max_entries = ARRAY_SIZE(entries); @@ -65,19 +65,19 @@ static void backtrace_test_saved(void) #else static void backtrace_test_saved(void) { - printk("Saved backtrace test skipped.\n"); + pr_info("Saved backtrace test skipped.\n"); } #endif static int backtrace_regression_test(void) { - printk("====[ backtrace testing ]===========\n"); + pr_info("====[ backtrace testing ]===========\n"); backtrace_test_normal(); backtrace_test_irq(); backtrace_test_saved(); - printk("====[ end of backtrace testing ]====\n"); + pr_info("====[ end of backtrace testing ]====\n"); return 0; } diff --git a/kernel/capability.c b/kernel/capability.c index a8d63df0c322..84b2bbf443e7 100644 --- a/kernel/capability.c +++ b/kernel/capability.c @@ -24,7 +24,6 @@ */ const kernel_cap_t __cap_empty_set = CAP_EMPTY_SET; - EXPORT_SYMBOL(__cap_empty_set); int file_caps_enabled = 1; @@ -189,7 +188,7 @@ SYSCALL_DEFINE2(capget, cap_user_header_t, header, cap_user_data_t, dataptr) * * An alternative would be to return an error here * (-ERANGE), but that causes legacy applications to - * unexpectidly fail; the capget/modify/capset aborts + * unexpectedly fail; the capget/modify/capset aborts * before modification is attempted and the application * fails. */ @@ -395,7 +394,8 @@ EXPORT_SYMBOL(ns_capable); * This does not set PF_SUPERPRIV because the caller may not * actually be privileged. */ -bool file_ns_capable(const struct file *file, struct user_namespace *ns, int cap) +bool file_ns_capable(const struct file *file, struct user_namespace *ns, + int cap) { if (WARN_ON_ONCE(!cap_valid(cap))) return false; diff --git a/kernel/compat.c b/kernel/compat.c index e40b0430b562..633394f442f8 100644 --- a/kernel/compat.c +++ b/kernel/compat.c @@ -157,7 +157,7 @@ static int __compat_put_timespec(const struct timespec *ts, struct compat_timesp int compat_get_timeval(struct timeval *tv, const void __user *utv) { if (COMPAT_USE_64BIT_TIME) - return copy_from_user(tv, utv, sizeof *tv) ? -EFAULT : 0; + return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0; else return __compat_get_timeval(tv, utv); } @@ -166,7 +166,7 @@ EXPORT_SYMBOL_GPL(compat_get_timeval); int compat_put_timeval(const struct timeval *tv, void __user *utv) { if (COMPAT_USE_64BIT_TIME) - return copy_to_user(utv, tv, sizeof *tv) ? -EFAULT : 0; + return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0; else return __compat_put_timeval(tv, utv); } @@ -175,7 +175,7 @@ EXPORT_SYMBOL_GPL(compat_put_timeval); int compat_get_timespec(struct timespec *ts, const void __user *uts) { if (COMPAT_USE_64BIT_TIME) - return copy_from_user(ts, uts, sizeof *ts) ? -EFAULT : 0; + return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0; else return __compat_get_timespec(ts, uts); } @@ -184,7 +184,7 @@ EXPORT_SYMBOL_GPL(compat_get_timespec); int compat_put_timespec(const struct timespec *ts, void __user *uts) { if (COMPAT_USE_64BIT_TIME) - return copy_to_user(uts, ts, sizeof *ts) ? -EFAULT : 0; + return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0; else return __compat_put_timespec(ts, uts); } diff --git a/kernel/cpu.c b/kernel/cpu.c index 247979a1b815..acf791c55b71 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -283,8 +283,7 @@ static inline void check_for_tasks(int cpu) task_cputime(p, &utime, &stime); if (task_cpu(p) == cpu && p->state == TASK_RUNNING && (utime || stime)) - printk(KERN_WARNING "Task %s (pid = %d) is on cpu %d " - "(state = %ld, flags = %x)\n", + pr_warn("Task %s (pid = %d) is on cpu %d (state = %ld, flags = %x)\n", p->comm, task_pid_nr(p), cpu, p->state, p->flags); } @@ -336,8 +335,8 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) if (err) { nr_calls--; __cpu_notify(CPU_DOWN_FAILED | mod, hcpu, nr_calls, NULL); - printk("%s: attempt to take down CPU %u failed\n", - __func__, cpu); + pr_warn("%s: attempt to take down CPU %u failed\n", + __func__, cpu); goto out_release; } @@ -444,8 +443,8 @@ static int _cpu_up(unsigned int cpu, int tasks_frozen) ret = __cpu_notify(CPU_UP_PREPARE | mod, hcpu, -1, &nr_calls); if (ret) { nr_calls--; - printk(KERN_WARNING "%s: attempt to bring up CPU %u failed\n", - __func__, cpu); + pr_warn("%s: attempt to bring up CPU %u failed\n", + __func__, cpu); goto out_notify; } @@ -475,11 +474,10 @@ int cpu_up(unsigned int cpu) int err = 0; if (!cpu_possible(cpu)) { - printk(KERN_ERR "can't online cpu %d because it is not " - "configured as may-hotadd at boot time\n", cpu); + pr_err("can't online cpu %d because it is not configured as may-hotadd at boot time\n", + cpu); #if defined(CONFIG_IA64) - printk(KERN_ERR "please check additional_cpus= boot " - "parameter\n"); + pr_err("please check additional_cpus= boot parameter\n"); #endif return -EINVAL; } @@ -518,7 +516,7 @@ int disable_nonboot_cpus(void) */ cpumask_clear(frozen_cpus); - printk("Disabling non-boot CPUs ...\n"); + pr_info("Disabling non-boot CPUs ...\n"); for_each_online_cpu(cpu) { if (cpu == first_cpu) continue; @@ -526,8 +524,7 @@ int disable_nonboot_cpus(void) if (!error) cpumask_set_cpu(cpu, frozen_cpus); else { - printk(KERN_ERR "Error taking CPU%d down: %d\n", - cpu, error); + pr_err("Error taking CPU%d down: %d\n", cpu, error); break; } } @@ -537,7 +534,7 @@ int disable_nonboot_cpus(void) /* Make sure the CPUs won't be enabled by someone else */ cpu_hotplug_disabled = 1; } else { - printk(KERN_ERR "Non-boot CPUs are not disabled\n"); + pr_err("Non-boot CPUs are not disabled\n"); } cpu_maps_update_done(); return error; @@ -561,17 +558,17 @@ void __ref enable_nonboot_cpus(void) if (cpumask_empty(frozen_cpus)) goto out; - printk(KERN_INFO "Enabling non-boot CPUs ...\n"); + pr_info("Enabling non-boot CPUs ...\n"); arch_enable_nonboot_cpus_begin(); for_each_cpu(cpu, frozen_cpus) { error = _cpu_up(cpu, 1); if (!error) { - printk(KERN_INFO "CPU%d is up\n", cpu); + pr_info("CPU%d is up\n", cpu); continue; } - printk(KERN_WARNING "Error taking CPU%d up: %d\n", cpu, error); + pr_warn("Error taking CPU%d up: %d\n", cpu, error); } arch_enable_nonboot_cpus_end(); diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 3d54c418bd06..130017843899 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -61,12 +61,7 @@ #include <linux/cgroup.h> #include <linux/wait.h> -/* - * Tracks how many cpusets are currently defined in system. - * When there is only one cpuset (the root cpuset) we can - * short circuit some hooks. - */ -int number_of_cpusets __read_mostly; +struct static_key cpusets_enabled_key __read_mostly = STATIC_KEY_INIT_FALSE; /* See "Frequency meter" comments, below. */ @@ -611,7 +606,7 @@ static int generate_sched_domains(cpumask_var_t **domains, goto done; } - csa = kmalloc(number_of_cpusets * sizeof(cp), GFP_KERNEL); + csa = kmalloc(nr_cpusets() * sizeof(cp), GFP_KERNEL); if (!csa) goto done; csn = 0; @@ -1888,7 +1883,7 @@ static int cpuset_css_online(struct cgroup_subsys_state *css) if (is_spread_slab(parent)) set_bit(CS_SPREAD_SLAB, &cs->flags); - number_of_cpusets++; + cpuset_inc(); if (!test_bit(CGRP_CPUSET_CLONE_CHILDREN, &css->cgroup->flags)) goto out_unlock; @@ -1939,7 +1934,7 @@ static void cpuset_css_offline(struct cgroup_subsys_state *css) if (is_sched_load_balance(cs)) update_flag(CS_SCHED_LOAD_BALANCE, cs, 0); - number_of_cpusets--; + cpuset_dec(); clear_bit(CS_ONLINE, &cs->flags); mutex_unlock(&cpuset_mutex); @@ -1992,7 +1987,6 @@ int __init cpuset_init(void) if (!alloc_cpumask_var(&cpus_attach, GFP_KERNEL)) BUG(); - number_of_cpusets = 1; return 0; } diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c index 2956c8da1605..1adf62b39b96 100644 --- a/kernel/debug/debug_core.c +++ b/kernel/debug/debug_core.c @@ -534,7 +534,7 @@ return_normal: kgdb_info[cpu].exception_state &= ~(DCPU_WANT_MASTER | DCPU_IS_SLAVE); kgdb_info[cpu].enter_kgdb--; - smp_mb__before_atomic_dec(); + smp_mb__before_atomic(); atomic_dec(&slaves_in_kgdb); dbg_touch_watchdogs(); local_irq_restore(flags); @@ -662,7 +662,7 @@ kgdb_restore: kgdb_info[cpu].exception_state &= ~(DCPU_WANT_MASTER | DCPU_IS_SLAVE); kgdb_info[cpu].enter_kgdb--; - smp_mb__before_atomic_dec(); + smp_mb__before_atomic(); atomic_dec(&masters_in_kgdb); /* Free kgdb_active */ atomic_set(&kgdb_active, -1); diff --git a/kernel/debug/kdb/kdb_bt.c b/kernel/debug/kdb/kdb_bt.c index b03e0e814e43..fe15fff5df53 100644 --- a/kernel/debug/kdb/kdb_bt.c +++ b/kernel/debug/kdb/kdb_bt.c @@ -21,7 +21,7 @@ static void kdb_show_stack(struct task_struct *p, void *addr) { int old_lvl = console_loglevel; - console_loglevel = 15; + console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH; kdb_trap_printk++; kdb_set_current_task(p); if (addr) { diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c index 14ff4849262c..7c70812caea5 100644 --- a/kernel/debug/kdb/kdb_io.c +++ b/kernel/debug/kdb/kdb_io.c @@ -710,7 +710,7 @@ kdb_printit: } if (logging) { saved_loglevel = console_loglevel; - console_loglevel = 0; + console_loglevel = CONSOLE_LOGLEVEL_SILENT; printk(KERN_INFO "%s", kdb_buffer); } diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c index 0b097c8a1e50..2f7c760305ca 100644 --- a/kernel/debug/kdb/kdb_main.c +++ b/kernel/debug/kdb/kdb_main.c @@ -1091,7 +1091,7 @@ static int kdb_reboot(int argc, const char **argv) static void kdb_dumpregs(struct pt_regs *regs) { int old_lvl = console_loglevel; - console_loglevel = 15; + console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH; kdb_trap_printk++; show_regs(regs); kdb_trap_printk--; diff --git a/kernel/events/core.c b/kernel/events/core.c index 440eefc67397..689237a0c5e8 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -39,6 +39,7 @@ #include <linux/hw_breakpoint.h> #include <linux/mm_types.h> #include <linux/cgroup.h> +#include <linux/module.h> #include "internal.h" @@ -1677,6 +1678,8 @@ event_sched_in(struct perf_event *event, u64 tstamp = perf_event_time(event); int ret = 0; + lockdep_assert_held(&ctx->lock); + if (event->state <= PERF_EVENT_STATE_OFF) return 0; @@ -3244,9 +3247,13 @@ static void __free_event(struct perf_event *event) if (event->ctx) put_ctx(event->ctx); + if (event->pmu) + module_put(event->pmu->module); + call_rcu(&event->rcu_head, free_event_rcu); } -static void free_event(struct perf_event *event) + +static void _free_event(struct perf_event *event) { irq_work_sync(&event->pending); @@ -3267,42 +3274,31 @@ static void free_event(struct perf_event *event) if (is_cgroup_event(event)) perf_detach_cgroup(event); - __free_event(event); } -int perf_event_release_kernel(struct perf_event *event) +/* + * Used to free events which have a known refcount of 1, such as in error paths + * where the event isn't exposed yet and inherited events. + */ +static void free_event(struct perf_event *event) { - struct perf_event_context *ctx = event->ctx; - - WARN_ON_ONCE(ctx->parent_ctx); - /* - * There are two ways this annotation is useful: - * - * 1) there is a lock recursion from perf_event_exit_task - * see the comment there. - * - * 2) there is a lock-inversion with mmap_sem through - * perf_event_read_group(), which takes faults while - * holding ctx->mutex, however this is called after - * the last filedesc died, so there is no possibility - * to trigger the AB-BA case. - */ - mutex_lock_nested(&ctx->mutex, SINGLE_DEPTH_NESTING); - perf_remove_from_context(event, true); - mutex_unlock(&ctx->mutex); - - free_event(event); + if (WARN(atomic_long_cmpxchg(&event->refcount, 1, 0) != 1, + "unexpected event refcount: %ld; ptr=%p\n", + atomic_long_read(&event->refcount), event)) { + /* leak to avoid use-after-free */ + return; + } - return 0; + _free_event(event); } -EXPORT_SYMBOL_GPL(perf_event_release_kernel); /* * Called when the last reference to the file is gone. */ static void put_event(struct perf_event *event) { + struct perf_event_context *ctx = event->ctx; struct task_struct *owner; if (!atomic_long_dec_and_test(&event->refcount)) @@ -3341,9 +3337,33 @@ static void put_event(struct perf_event *event) put_task_struct(owner); } - perf_event_release_kernel(event); + WARN_ON_ONCE(ctx->parent_ctx); + /* + * There are two ways this annotation is useful: + * + * 1) there is a lock recursion from perf_event_exit_task + * see the comment there. + * + * 2) there is a lock-inversion with mmap_sem through + * perf_event_read_group(), which takes faults while + * holding ctx->mutex, however this is called after + * the last filedesc died, so there is no possibility + * to trigger the AB-BA case. + */ + mutex_lock_nested(&ctx->mutex, SINGLE_DEPTH_NESTING); + perf_remove_from_context(event, true); + mutex_unlock(&ctx->mutex); + + _free_event(event); } +int perf_event_release_kernel(struct perf_event *event) +{ + put_event(event); + return 0; +} +EXPORT_SYMBOL_GPL(perf_event_release_kernel); + static int perf_release(struct inode *inode, struct file *file) { put_event(file->private_data); @@ -6578,6 +6598,7 @@ free_pdc: free_percpu(pmu->pmu_disable_count); goto unlock; } +EXPORT_SYMBOL_GPL(perf_pmu_register); void perf_pmu_unregister(struct pmu *pmu) { @@ -6599,6 +6620,7 @@ void perf_pmu_unregister(struct pmu *pmu) put_device(pmu->dev); free_pmu_context(pmu); } +EXPORT_SYMBOL_GPL(perf_pmu_unregister); struct pmu *perf_init_event(struct perf_event *event) { @@ -6612,6 +6634,10 @@ struct pmu *perf_init_event(struct perf_event *event) pmu = idr_find(&pmu_idr, event->attr.type); rcu_read_unlock(); if (pmu) { + if (!try_module_get(pmu->module)) { + pmu = ERR_PTR(-ENODEV); + goto unlock; + } event->pmu = pmu; ret = pmu->event_init(event); if (ret) @@ -6620,6 +6646,10 @@ struct pmu *perf_init_event(struct perf_event *event) } list_for_each_entry_rcu(pmu, &pmus, entry) { + if (!try_module_get(pmu->module)) { + pmu = ERR_PTR(-ENODEV); + goto unlock; + } event->pmu = pmu; ret = pmu->event_init(event); if (!ret) @@ -6798,6 +6828,7 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu, err_pmu: if (event->destroy) event->destroy(event); + module_put(pmu->module); err_ns: if (event->ns) put_pid_ns(event->ns); @@ -7067,20 +7098,26 @@ SYSCALL_DEFINE5(perf_event_open, } } + if (task && group_leader && + group_leader->attr.inherit != attr.inherit) { + err = -EINVAL; + goto err_task; + } + get_online_cpus(); event = perf_event_alloc(&attr, cpu, task, group_leader, NULL, NULL, NULL); if (IS_ERR(event)) { err = PTR_ERR(event); - goto err_task; + goto err_cpus; } if (flags & PERF_FLAG_PID_CGROUP) { err = perf_cgroup_connect(pid, event, &attr, group_leader); if (err) { __free_event(event); - goto err_task; + goto err_cpus; } } @@ -7242,8 +7279,9 @@ err_context: put_ctx(ctx); err_alloc: free_event(event); -err_task: +err_cpus: put_online_cpus(); +err_task: if (task) put_task_struct(task); err_group_fd: @@ -7379,7 +7417,7 @@ __perf_event_exit_task(struct perf_event *child_event, struct perf_event_context *child_ctx, struct task_struct *child) { - perf_remove_from_context(child_event, !!child_event->parent); + perf_remove_from_context(child_event, true); /* * It can happen that the parent exits first, and has events @@ -7394,7 +7432,7 @@ __perf_event_exit_task(struct perf_event *child_event, static void perf_event_exit_task_context(struct task_struct *child, int ctxn) { - struct perf_event *child_event, *tmp; + struct perf_event *child_event; struct perf_event_context *child_ctx; unsigned long flags; @@ -7448,24 +7486,9 @@ static void perf_event_exit_task_context(struct task_struct *child, int ctxn) */ mutex_lock(&child_ctx->mutex); -again: - list_for_each_entry_safe(child_event, tmp, &child_ctx->pinned_groups, - group_entry) - __perf_event_exit_task(child_event, child_ctx, child); - - list_for_each_entry_safe(child_event, tmp, &child_ctx->flexible_groups, - group_entry) + list_for_each_entry_rcu(child_event, &child_ctx->event_list, event_entry) __perf_event_exit_task(child_event, child_ctx, child); - /* - * If the last event was a group event, it will have appended all - * its siblings to the list, but we obtained 'tmp' before that which - * will still point to the list head terminating the iteration. - */ - if (!list_empty(&child_ctx->pinned_groups) || - !list_empty(&child_ctx->flexible_groups)) - goto again; - mutex_unlock(&child_ctx->mutex); put_ctx(child_ctx); diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 04709b66369d..adcd76a96839 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -60,8 +60,6 @@ static struct percpu_rw_semaphore dup_mmap_sem; /* Have a copy of original instruction */ #define UPROBE_COPY_INSN 0 -/* Can skip singlestep */ -#define UPROBE_SKIP_SSTEP 1 struct uprobe { struct rb_node rb_node; /* node in the rb tree */ @@ -491,12 +489,9 @@ static struct uprobe *alloc_uprobe(struct inode *inode, loff_t offset) uprobe->offset = offset; init_rwsem(&uprobe->register_rwsem); init_rwsem(&uprobe->consumer_rwsem); - /* For now assume that the instruction need not be single-stepped */ - __set_bit(UPROBE_SKIP_SSTEP, &uprobe->flags); /* add to uprobes_tree, sorted on inode:offset */ cur_uprobe = insert_uprobe(uprobe); - /* a uprobe exists for this inode:offset combination */ if (cur_uprobe) { kfree(uprobe); @@ -1296,14 +1291,8 @@ static unsigned long xol_get_insn_slot(struct uprobe *uprobe) if (unlikely(!xol_vaddr)) return 0; - /* Initialize the slot */ - copy_to_page(area->page, xol_vaddr, - &uprobe->arch.ixol, sizeof(uprobe->arch.ixol)); - /* - * We probably need flush_icache_user_range() but it needs vma. - * This should work on supported architectures too. - */ - flush_dcache_page(area->page); + arch_uprobe_copy_ixol(area->page, xol_vaddr, + &uprobe->arch.ixol, sizeof(uprobe->arch.ixol)); return xol_vaddr; } @@ -1346,6 +1335,21 @@ static void xol_free_insn_slot(struct task_struct *tsk) } } +void __weak arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr, + void *src, unsigned long len) +{ + /* Initialize the slot */ + copy_to_page(page, vaddr, src, len); + + /* + * We probably need flush_icache_user_range() but it needs vma. + * This should work on most of architectures by default. If + * architecture needs to do something different it can define + * its own version of the function. + */ + flush_dcache_page(page); +} + /** * uprobe_get_swbp_addr - compute address of swbp given post-swbp regs * @regs: Reflects the saved state of the task after it has hit a breakpoint @@ -1628,20 +1632,6 @@ bool uprobe_deny_signal(void) return true; } -/* - * Avoid singlestepping the original instruction if the original instruction - * is a NOP or can be emulated. - */ -static bool can_skip_sstep(struct uprobe *uprobe, struct pt_regs *regs) -{ - if (test_bit(UPROBE_SKIP_SSTEP, &uprobe->flags)) { - if (arch_uprobe_skip_sstep(&uprobe->arch, regs)) - return true; - clear_bit(UPROBE_SKIP_SSTEP, &uprobe->flags); - } - return false; -} - static void mmf_recalc_uprobes(struct mm_struct *mm) { struct vm_area_struct *vma; @@ -1868,13 +1858,13 @@ static void handle_swbp(struct pt_regs *regs) handler_chain(uprobe, regs); - if (can_skip_sstep(uprobe, regs)) + if (arch_uprobe_skip_sstep(&uprobe->arch, regs)) goto out; if (!pre_ssout(uprobe, regs, bp_vaddr)) return; - /* can_skip_sstep() succeeded, or restart if can't singlestep */ + /* arch_uprobe_skip_sstep() succeeded, or restart if can't singlestep */ out: put_uprobe(uprobe); } @@ -1886,10 +1876,11 @@ out: static void handle_singlestep(struct uprobe_task *utask, struct pt_regs *regs) { struct uprobe *uprobe; + int err = 0; uprobe = utask->active_uprobe; if (utask->state == UTASK_SSTEP_ACK) - arch_uprobe_post_xol(&uprobe->arch, regs); + err = arch_uprobe_post_xol(&uprobe->arch, regs); else if (utask->state == UTASK_SSTEP_TRAPPED) arch_uprobe_abort_xol(&uprobe->arch, regs); else @@ -1903,6 +1894,11 @@ static void handle_singlestep(struct uprobe_task *utask, struct pt_regs *regs) spin_lock_irq(¤t->sighand->siglock); recalc_sigpending(); /* see uprobe_deny_signal() */ spin_unlock_irq(¤t->sighand->siglock); + + if (unlikely(err)) { + uprobe_warn(current, "execute the probed insn, sending SIGILL."); + force_sig_info(SIGILL, SEND_SIG_FORCED, current); + } } /* diff --git a/kernel/exec_domain.c b/kernel/exec_domain.c index 0dbeae374225..83d4382f5699 100644 --- a/kernel/exec_domain.c +++ b/kernel/exec_domain.c @@ -37,7 +37,7 @@ static unsigned long ident_map[32] = { struct exec_domain default_exec_domain = { .name = "Linux", /* name */ .handler = default_handler, /* lcall7 causes a seg fault. */ - .pers_low = 0, /* PER_LINUX personality. */ + .pers_low = 0, /* PER_LINUX personality. */ .pers_high = 0, /* PER_LINUX personality. */ .signal_map = ident_map, /* Identity map signals. */ .signal_invmap = ident_map, /* - both ways. */ @@ -83,7 +83,7 @@ lookup_exec_domain(unsigned int personality) ep = &default_exec_domain; out: read_unlock(&exec_domains_lock); - return (ep); + return ep; } int @@ -110,8 +110,9 @@ register_exec_domain(struct exec_domain *ep) out: write_unlock(&exec_domains_lock); - return (err); + return err; } +EXPORT_SYMBOL(register_exec_domain); int unregister_exec_domain(struct exec_domain *ep) @@ -133,6 +134,7 @@ unregister: write_unlock(&exec_domains_lock); return 0; } +EXPORT_SYMBOL(unregister_exec_domain); int __set_personality(unsigned int personality) { @@ -144,6 +146,7 @@ int __set_personality(unsigned int personality) return 0; } +EXPORT_SYMBOL(__set_personality); #ifdef CONFIG_PROC_FS static int execdomains_proc_show(struct seq_file *m, void *v) @@ -188,8 +191,3 @@ SYSCALL_DEFINE1(personality, unsigned int, personality) return old; } - - -EXPORT_SYMBOL(register_exec_domain); -EXPORT_SYMBOL(unregister_exec_domain); -EXPORT_SYMBOL(__set_personality); diff --git a/kernel/exit.c b/kernel/exit.c index 6ed6a1d552b5..e5c4668f1799 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -313,46 +313,7 @@ kill_orphaned_pgrp(struct task_struct *tsk, struct task_struct *parent) } } -/* - * Let kernel threads use this to say that they allow a certain signal. - * Must not be used if kthread was cloned with CLONE_SIGHAND. - */ -int allow_signal(int sig) -{ - if (!valid_signal(sig) || sig < 1) - return -EINVAL; - - spin_lock_irq(¤t->sighand->siglock); - /* This is only needed for daemonize()'ed kthreads */ - sigdelset(¤t->blocked, sig); - /* - * Kernel threads handle their own signals. Let the signal code - * know it'll be handled, so that they don't get converted to - * SIGKILL or just silently dropped. - */ - current->sighand->action[(sig)-1].sa.sa_handler = (void __user *)2; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - return 0; -} - -EXPORT_SYMBOL(allow_signal); - -int disallow_signal(int sig) -{ - if (!valid_signal(sig) || sig < 1) - return -EINVAL; - - spin_lock_irq(¤t->sighand->siglock); - current->sighand->action[(sig)-1].sa.sa_handler = SIG_IGN; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - return 0; -} - -EXPORT_SYMBOL(disallow_signal); - -#ifdef CONFIG_MM_OWNER +#ifdef CONFIG_MEMCG /* * A task is exiting. If it owned this mm, find a new owner for the mm. */ @@ -395,14 +356,18 @@ retry: } /* - * Search through everything else. We should not get - * here often + * Search through everything else, we should not get here often. */ - do_each_thread(g, c) { - if (c->mm == mm) - goto assign_new_owner; - } while_each_thread(g, c); - + for_each_process(g) { + if (g->flags & PF_KTHREAD) + continue; + for_each_thread(g, c) { + if (c->mm == mm) + goto assign_new_owner; + if (c->mm) + break; + } + } read_unlock(&tasklist_lock); /* * We found no owner yet mm_users > 1: this implies that we are @@ -434,7 +399,7 @@ assign_new_owner: task_unlock(c); put_task_struct(c); } -#endif /* CONFIG_MM_OWNER */ +#endif /* CONFIG_MEMCG */ /* * Turn us into a lazy TLB process if we diff --git a/kernel/fork.c b/kernel/fork.c index 54a8d26f612f..d2799d1fc952 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -150,15 +150,15 @@ void __weak arch_release_thread_info(struct thread_info *ti) static struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node) { - struct page *page = alloc_pages_node(node, THREADINFO_GFP_ACCOUNTED, - THREAD_SIZE_ORDER); + struct page *page = alloc_kmem_pages_node(node, THREADINFO_GFP, + THREAD_SIZE_ORDER); return page ? page_address(page) : NULL; } static inline void free_thread_info(struct thread_info *ti) { - free_memcg_kmem_pages((unsigned long)ti, THREAD_SIZE_ORDER); + free_kmem_pages((unsigned long)ti, THREAD_SIZE_ORDER); } # else static struct kmem_cache *thread_info_cache; @@ -1099,12 +1099,12 @@ static void rt_mutex_init_task(struct task_struct *p) #endif } -#ifdef CONFIG_MM_OWNER +#ifdef CONFIG_MEMCG void mm_init_owner(struct mm_struct *mm, struct task_struct *p) { mm->owner = p; } -#endif /* CONFIG_MM_OWNER */ +#endif /* CONFIG_MEMCG */ /* * Initialize POSIX timer handling for a single task. @@ -1606,10 +1606,12 @@ long do_fork(unsigned long clone_flags, */ if (!IS_ERR(p)) { struct completion vfork; + struct pid *pid; trace_sched_process_fork(current, p); - nr = task_pid_vnr(p); + pid = get_task_pid(p, PIDTYPE_PID); + nr = pid_vnr(pid); if (clone_flags & CLONE_PARENT_SETTID) put_user(nr, parent_tidptr); @@ -1624,12 +1626,14 @@ long do_fork(unsigned long clone_flags, /* forking complete and child started to run, tell ptracer */ if (unlikely(trace)) - ptrace_event(trace, nr); + ptrace_event_pid(trace, pid); if (clone_flags & CLONE_VFORK) { if (!wait_for_vfork_done(p, &vfork)) - ptrace_event(PTRACE_EVENT_VFORK_DONE, nr); + ptrace_event_pid(PTRACE_EVENT_VFORK_DONE, pid); } + + put_pid(pid); } else { nr = PTR_ERR(p); } diff --git a/kernel/futex.c b/kernel/futex.c index de938d20df19..b632b5f3f094 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -267,7 +267,7 @@ static inline void futex_get_mm(union futex_key *key) * get_futex_key() implies a full barrier. This is relied upon * as full barrier (B), see the ordering comment above. */ - smp_mb__after_atomic_inc(); + smp_mb__after_atomic(); } /* @@ -280,7 +280,7 @@ static inline void hb_waiters_inc(struct futex_hash_bucket *hb) /* * Full barrier (A), see the ordering comment above. */ - smp_mb__after_atomic_inc(); + smp_mb__after_atomic(); #endif } diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c index e0501fe7140d..3ab28993f6e0 100644 --- a/kernel/hrtimer.c +++ b/kernel/hrtimer.c @@ -1039,6 +1039,7 @@ int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, return ret; } +EXPORT_SYMBOL_GPL(__hrtimer_start_range_ns); /** * hrtimer_start_range_ns - (re)start an hrtimer on the current CPU diff --git a/kernel/hung_task.c b/kernel/hung_task.c index 06bb1417b063..06db12434d72 100644 --- a/kernel/hung_task.c +++ b/kernel/hung_task.c @@ -52,8 +52,10 @@ unsigned int __read_mostly sysctl_hung_task_panic = static int __init hung_task_panic_setup(char *str) { - sysctl_hung_task_panic = simple_strtoul(str, NULL, 0); + int rc = kstrtouint(str, 0, &sysctl_hung_task_panic); + if (rc) + return rc; return 1; } __setup("hung_task_panic=", hung_task_panic_setup); diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig index 07cbdfea9ae2..d269cecdfbf0 100644 --- a/kernel/irq/Kconfig +++ b/kernel/irq/Kconfig @@ -5,6 +5,10 @@ menu "IRQ subsystem" config MAY_HAVE_SPARSE_IRQ bool +# Legacy support, required for itanic +config GENERIC_IRQ_LEGACY + bool + # Enable the generic irq autoprobe mechanism config GENERIC_IRQ_PROBE bool @@ -17,6 +21,11 @@ config GENERIC_IRQ_SHOW config GENERIC_IRQ_SHOW_LEVEL bool +# Facility to allocate a hardware interrupt. This is legacy support +# and should not be used in new code. Use irq domains instead. +config GENERIC_IRQ_LEGACY_ALLOC_HWIRQ + bool + # Support for delayed migration from interrupt context config GENERIC_PENDING_IRQ bool diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 6397df2d6945..a2b28a2fd7b1 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -40,10 +40,9 @@ int irq_set_chip(unsigned int irq, struct irq_chip *chip) irq_put_desc_unlock(desc, flags); /* * For !CONFIG_SPARSE_IRQ make the irq show up in - * allocated_irqs. For the CONFIG_SPARSE_IRQ case, it is - * already marked, and this call is harmless. + * allocated_irqs. */ - irq_reserve_irq(irq); + irq_mark_irq(irq); return 0; } EXPORT_SYMBOL(irq_set_chip); diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h index ddf1ffeb79f1..099ea2e0eb88 100644 --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -33,7 +33,7 @@ enum { }; /* - * Bit masks for desc->state + * Bit masks for desc->core_internal_state__do_not_mess_with_it * * IRQS_AUTODETECT - autodetection in progress * IRQS_SPURIOUS_DISABLED - was disabled due to spurious interrupt @@ -76,6 +76,12 @@ extern void mask_irq(struct irq_desc *desc); extern void unmask_irq(struct irq_desc *desc); extern void unmask_threaded_irq(struct irq_desc *desc); +#ifdef CONFIG_SPARSE_IRQ +static inline void irq_mark_irq(unsigned int irq) { } +#else +extern void irq_mark_irq(unsigned int irq); +#endif + extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr); irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action); diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index bb07f2928f4b..7339e42a85ab 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -278,7 +278,12 @@ EXPORT_SYMBOL(irq_to_desc); static void free_desc(unsigned int irq) { - dynamic_irq_cleanup(irq); + struct irq_desc *desc = irq_to_desc(irq); + unsigned long flags; + + raw_spin_lock_irqsave(&desc->lock, flags); + desc_set_defaults(irq, desc, desc_node(desc), NULL); + raw_spin_unlock_irqrestore(&desc->lock, flags); } static inline int alloc_descs(unsigned int start, unsigned int cnt, int node, @@ -299,6 +304,20 @@ static int irq_expand_nr_irqs(unsigned int nr) return -ENOMEM; } +void irq_mark_irq(unsigned int irq) +{ + mutex_lock(&sparse_irq_lock); + bitmap_set(allocated_irqs, irq, 1); + mutex_unlock(&sparse_irq_lock); +} + +#ifdef CONFIG_GENERIC_IRQ_LEGACY +void irq_init_desc(unsigned int irq) +{ + free_desc(irq); +} +#endif + #endif /* !CONFIG_SPARSE_IRQ */ /** @@ -396,30 +415,56 @@ err: } EXPORT_SYMBOL_GPL(__irq_alloc_descs); +#ifdef CONFIG_GENERIC_IRQ_LEGACY_ALLOC_HWIRQ /** - * irq_reserve_irqs - mark irqs allocated - * @from: mark from irq number - * @cnt: number of irqs to mark + * irq_alloc_hwirqs - Allocate an irq descriptor and initialize the hardware + * @cnt: number of interrupts to allocate + * @node: node on which to allocate * - * Returns 0 on success or an appropriate error code + * Returns an interrupt number > 0 or 0, if the allocation fails. */ -int irq_reserve_irqs(unsigned int from, unsigned int cnt) +unsigned int irq_alloc_hwirqs(int cnt, int node) { - unsigned int start; - int ret = 0; + int i, irq = __irq_alloc_descs(-1, 0, cnt, node, NULL); - if (!cnt || (from + cnt) > nr_irqs) - return -EINVAL; + if (irq < 0) + return 0; - mutex_lock(&sparse_irq_lock); - start = bitmap_find_next_zero_area(allocated_irqs, nr_irqs, from, cnt, 0); - if (start == from) - bitmap_set(allocated_irqs, start, cnt); - else - ret = -EEXIST; - mutex_unlock(&sparse_irq_lock); - return ret; + for (i = irq; cnt > 0; i++, cnt--) { + if (arch_setup_hwirq(i, node)) + goto err; + irq_clear_status_flags(i, _IRQ_NOREQUEST); + } + return irq; + +err: + for (i--; i >= irq; i--) { + irq_set_status_flags(i, _IRQ_NOREQUEST | _IRQ_NOPROBE); + arch_teardown_hwirq(i); + } + irq_free_descs(irq, cnt); + return 0; +} +EXPORT_SYMBOL_GPL(irq_alloc_hwirqs); + +/** + * irq_free_hwirqs - Free irq descriptor and cleanup the hardware + * @from: Free from irq number + * @cnt: number of interrupts to free + * + */ +void irq_free_hwirqs(unsigned int from, int cnt) +{ + int i; + + for (i = from; cnt > 0; i++, cnt--) { + irq_set_status_flags(i, _IRQ_NOREQUEST | _IRQ_NOPROBE); + arch_teardown_hwirq(i); + } + irq_free_descs(from, cnt); } +EXPORT_SYMBOL_GPL(irq_free_hwirqs); +#endif /** * irq_get_next_irq - get next allocated irq number @@ -482,20 +527,6 @@ int irq_set_percpu_devid(unsigned int irq) return 0; } -/** - * dynamic_irq_cleanup - cleanup a dynamically allocated irq - * @irq: irq number to initialize - */ -void dynamic_irq_cleanup(unsigned int irq) -{ - struct irq_desc *desc = irq_to_desc(irq); - unsigned long flags; - - raw_spin_lock_irqsave(&desc->lock, flags); - desc_set_defaults(irq, desc, desc_node(desc), NULL); - raw_spin_unlock_irqrestore(&desc->lock, flags); -} - void kstat_incr_irq_this_cpu(unsigned int irq) { kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq)); diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index f14033700c25..eb5e10e32e05 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -27,14 +27,14 @@ static struct irq_domain *irq_default_domain; * __irq_domain_add() - Allocate a new irq_domain data structure * @of_node: optional device-tree node of the interrupt controller * @size: Size of linear map; 0 for radix mapping only + * @hwirq_max: Maximum number of interrupts supported by controller * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no * direct mapping * @ops: map/unmap domain callbacks * @host_data: Controller private data pointer * - * Allocates and initialize and irq_domain structure. Caller is expected to - * register allocated irq_domain with irq_domain_register(). Returns pointer - * to IRQ domain, or NULL on failure. + * Allocates and initialize and irq_domain structure. + * Returns pointer to IRQ domain, or NULL on failure. */ struct irq_domain *__irq_domain_add(struct device_node *of_node, int size, irq_hw_number_t hwirq_max, int direct_max, diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index d34131ca372b..3dc6a61bf06a 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -886,8 +886,8 @@ static int irq_thread(void *data) irq_thread_check_affinity(desc, action); action_ret = handler_fn(desc, action); - if (!noirqdebug) - note_interrupt(action->irq, desc, action_ret); + if (action_ret == IRQ_HANDLED) + atomic_inc(&desc->threads_handled); wake_threads_waitq(desc); } diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c index a1d8cc63b56e..e2514b0e439e 100644 --- a/kernel/irq/spurious.c +++ b/kernel/irq/spurious.c @@ -270,6 +270,8 @@ try_misrouted_irq(unsigned int irq, struct irq_desc *desc, return action && (action->flags & IRQF_IRQPOLL); } +#define SPURIOUS_DEFERRED 0x80000000 + void note_interrupt(unsigned int irq, struct irq_desc *desc, irqreturn_t action_ret) { @@ -277,15 +279,111 @@ void note_interrupt(unsigned int irq, struct irq_desc *desc, irq_settings_is_polled(desc)) return; - /* we get here again via the threaded handler */ - if (action_ret == IRQ_WAKE_THREAD) - return; - if (bad_action_ret(action_ret)) { report_bad_irq(irq, desc, action_ret); return; } + /* + * We cannot call note_interrupt from the threaded handler + * because we need to look at the compound of all handlers + * (primary and threaded). Aside of that in the threaded + * shared case we have no serialization against an incoming + * hardware interrupt while we are dealing with a threaded + * result. + * + * So in case a thread is woken, we just note the fact and + * defer the analysis to the next hardware interrupt. + * + * The threaded handlers store whether they sucessfully + * handled an interrupt and we check whether that number + * changed versus the last invocation. + * + * We could handle all interrupts with the delayed by one + * mechanism, but for the non forced threaded case we'd just + * add pointless overhead to the straight hardirq interrupts + * for the sake of a few lines less code. + */ + if (action_ret & IRQ_WAKE_THREAD) { + /* + * There is a thread woken. Check whether one of the + * shared primary handlers returned IRQ_HANDLED. If + * not we defer the spurious detection to the next + * interrupt. + */ + if (action_ret == IRQ_WAKE_THREAD) { + int handled; + /* + * We use bit 31 of thread_handled_last to + * denote the deferred spurious detection + * active. No locking necessary as + * thread_handled_last is only accessed here + * and we have the guarantee that hard + * interrupts are not reentrant. + */ + if (!(desc->threads_handled_last & SPURIOUS_DEFERRED)) { + desc->threads_handled_last |= SPURIOUS_DEFERRED; + return; + } + /* + * Check whether one of the threaded handlers + * returned IRQ_HANDLED since the last + * interrupt happened. + * + * For simplicity we just set bit 31, as it is + * set in threads_handled_last as well. So we + * avoid extra masking. And we really do not + * care about the high bits of the handled + * count. We just care about the count being + * different than the one we saw before. + */ + handled = atomic_read(&desc->threads_handled); + handled |= SPURIOUS_DEFERRED; + if (handled != desc->threads_handled_last) { + action_ret = IRQ_HANDLED; + /* + * Note: We keep the SPURIOUS_DEFERRED + * bit set. We are handling the + * previous invocation right now. + * Keep it for the current one, so the + * next hardware interrupt will + * account for it. + */ + desc->threads_handled_last = handled; + } else { + /* + * None of the threaded handlers felt + * responsible for the last interrupt + * + * We keep the SPURIOUS_DEFERRED bit + * set in threads_handled_last as we + * need to account for the current + * interrupt as well. + */ + action_ret = IRQ_NONE; + } + } else { + /* + * One of the primary handlers returned + * IRQ_HANDLED. So we don't care about the + * threaded handlers on the same line. Clear + * the deferred detection bit. + * + * In theory we could/should check whether the + * deferred bit is set and take the result of + * the previous run into account here as + * well. But it's really not worth the + * trouble. If every other interrupt is + * handled we never trigger the spurious + * detector. And if this is just the one out + * of 100k unhandled ones which is handled + * then we merily delay the spurious detection + * by one hard interrupt. Not a real problem. + */ + desc->threads_handled_last &= ~SPURIOUS_DEFERRED; + } + } + if (unlikely(action_ret == IRQ_NONE)) { /* * If we are seeing only the odd spurious IRQ caused by diff --git a/kernel/kexec.c b/kernel/kexec.c index 28c57069ef68..6748688813d0 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -125,8 +125,8 @@ static struct page *kimage_alloc_page(struct kimage *image, unsigned long dest); static int do_kimage_alloc(struct kimage **rimage, unsigned long entry, - unsigned long nr_segments, - struct kexec_segment __user *segments) + unsigned long nr_segments, + struct kexec_segment __user *segments) { size_t segment_bytes; struct kimage *image; @@ -257,13 +257,13 @@ static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry, image->control_code_page = kimage_alloc_control_pages(image, get_order(KEXEC_CONTROL_PAGE_SIZE)); if (!image->control_code_page) { - printk(KERN_ERR "Could not allocate control_code_buffer\n"); + pr_err("Could not allocate control_code_buffer\n"); goto out_free; } image->swap_page = kimage_alloc_control_pages(image, 0); if (!image->swap_page) { - printk(KERN_ERR "Could not allocate swap buffer\n"); + pr_err("Could not allocate swap buffer\n"); goto out_free; } @@ -332,7 +332,7 @@ static int kimage_crash_alloc(struct kimage **rimage, unsigned long entry, image->control_code_page = kimage_alloc_control_pages(image, get_order(KEXEC_CONTROL_PAGE_SIZE)); if (!image->control_code_page) { - printk(KERN_ERR "Could not allocate control_code_buffer\n"); + pr_err("Could not allocate control_code_buffer\n"); goto out_free; } @@ -621,8 +621,8 @@ static void kimage_terminate(struct kimage *image) #define for_each_kimage_entry(image, ptr, entry) \ for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE); \ - ptr = (entry & IND_INDIRECTION)? \ - phys_to_virt((entry & PAGE_MASK)): ptr +1) + ptr = (entry & IND_INDIRECTION) ? \ + phys_to_virt((entry & PAGE_MASK)) : ptr + 1) static void kimage_free_entry(kimage_entry_t entry) { @@ -650,8 +650,7 @@ static void kimage_free(struct kimage *image) * done with it. */ ind = entry; - } - else if (entry & IND_SOURCE) + } else if (entry & IND_SOURCE) kimage_free_entry(entry); } /* Free the final indirection page */ @@ -774,8 +773,7 @@ static struct page *kimage_alloc_page(struct kimage *image, addr = old_addr; page = old_page; break; - } - else { + } else { /* Place the page on the destination list I * will use it later. */ @@ -1059,7 +1057,7 @@ COMPAT_SYSCALL_DEFINE4(kexec_load, compat_ulong_t, entry, return -EINVAL; ksegments = compat_alloc_user_space(nr_segments * sizeof(out)); - for (i=0; i < nr_segments; i++) { + for (i = 0; i < nr_segments; i++) { result = copy_from_user(&in, &segments[i], sizeof(in)); if (result) return -EFAULT; @@ -1214,14 +1212,14 @@ void crash_save_cpu(struct pt_regs *regs, int cpu) * squirrelled away. ELF notes happen to provide * all of that, so there is no need to invent something new. */ - buf = (u32*)per_cpu_ptr(crash_notes, cpu); + buf = (u32 *)per_cpu_ptr(crash_notes, cpu); if (!buf) return; memset(&prstatus, 0, sizeof(prstatus)); prstatus.pr_pid = current->pid; elf_core_copy_kernel_regs(&prstatus.pr_reg, regs); buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS, - &prstatus, sizeof(prstatus)); + &prstatus, sizeof(prstatus)); final_note(buf); } @@ -1230,8 +1228,7 @@ static int __init crash_notes_memory_init(void) /* Allocate memory for saving cpu registers. */ crash_notes = alloc_percpu(note_buf_t); if (!crash_notes) { - printk("Kexec: Memory allocation for saving cpu register" - " states failed\n"); + pr_warn("Kexec: Memory allocation for saving cpu register states failed\n"); return -ENOMEM; } return 0; @@ -1253,10 +1250,10 @@ subsys_initcall(crash_notes_memory_init); * * The function returns 0 on success and -EINVAL on failure. */ -static int __init parse_crashkernel_mem(char *cmdline, - unsigned long long system_ram, - unsigned long long *crash_size, - unsigned long long *crash_base) +static int __init parse_crashkernel_mem(char *cmdline, + unsigned long long system_ram, + unsigned long long *crash_size, + unsigned long long *crash_base) { char *cur = cmdline, *tmp; @@ -1267,12 +1264,12 @@ static int __init parse_crashkernel_mem(char *cmdline, /* get the start of the range */ start = memparse(cur, &tmp); if (cur == tmp) { - pr_warning("crashkernel: Memory value expected\n"); + pr_warn("crashkernel: Memory value expected\n"); return -EINVAL; } cur = tmp; if (*cur != '-') { - pr_warning("crashkernel: '-' expected\n"); + pr_warn("crashkernel: '-' expected\n"); return -EINVAL; } cur++; @@ -1281,31 +1278,30 @@ static int __init parse_crashkernel_mem(char *cmdline, if (*cur != ':') { end = memparse(cur, &tmp); if (cur == tmp) { - pr_warning("crashkernel: Memory " - "value expected\n"); + pr_warn("crashkernel: Memory value expected\n"); return -EINVAL; } cur = tmp; if (end <= start) { - pr_warning("crashkernel: end <= start\n"); + pr_warn("crashkernel: end <= start\n"); return -EINVAL; } } if (*cur != ':') { - pr_warning("crashkernel: ':' expected\n"); + pr_warn("crashkernel: ':' expected\n"); return -EINVAL; } cur++; size = memparse(cur, &tmp); if (cur == tmp) { - pr_warning("Memory value expected\n"); + pr_warn("Memory value expected\n"); return -EINVAL; } cur = tmp; if (size >= system_ram) { - pr_warning("crashkernel: invalid size\n"); + pr_warn("crashkernel: invalid size\n"); return -EINVAL; } @@ -1323,8 +1319,7 @@ static int __init parse_crashkernel_mem(char *cmdline, cur++; *crash_base = memparse(cur, &tmp); if (cur == tmp) { - pr_warning("Memory value expected " - "after '@'\n"); + pr_warn("Memory value expected after '@'\n"); return -EINVAL; } } @@ -1336,26 +1331,26 @@ static int __init parse_crashkernel_mem(char *cmdline, /* * That function parses "simple" (old) crashkernel command lines like * - * crashkernel=size[@offset] + * crashkernel=size[@offset] * * It returns 0 on success and -EINVAL on failure. */ -static int __init parse_crashkernel_simple(char *cmdline, - unsigned long long *crash_size, - unsigned long long *crash_base) +static int __init parse_crashkernel_simple(char *cmdline, + unsigned long long *crash_size, + unsigned long long *crash_base) { char *cur = cmdline; *crash_size = memparse(cmdline, &cur); if (cmdline == cur) { - pr_warning("crashkernel: memory value expected\n"); + pr_warn("crashkernel: memory value expected\n"); return -EINVAL; } if (*cur == '@') *crash_base = memparse(cur+1, &cur); else if (*cur != ' ' && *cur != '\0') { - pr_warning("crashkernel: unrecognized char\n"); + pr_warn("crashkernel: unrecognized char\n"); return -EINVAL; } @@ -1691,7 +1686,7 @@ int kernel_kexec(void) * CPU hotplug again; so re-enable it here. */ cpu_hotplug_enable(); - printk(KERN_EMERG "Starting new kernel\n"); + pr_emerg("Starting new kernel\n"); machine_shutdown(); } diff --git a/kernel/kmod.c b/kernel/kmod.c index 6b375af4958d..8637e041a247 100644 --- a/kernel/kmod.c +++ b/kernel/kmod.c @@ -285,10 +285,7 @@ static int wait_for_helper(void *data) pid_t pid; /* If SIGCLD is ignored sys_wait4 won't populate the status. */ - spin_lock_irq(¤t->sighand->siglock); - current->sighand->action[SIGCHLD-1].sa.sa_handler = SIG_DFL; - spin_unlock_irq(¤t->sighand->siglock); - + kernel_sigaction(SIGCHLD, SIG_DFL); pid = kernel_thread(____call_usermodehelper, sub_info, SIGCHLD); if (pid < 0) { sub_info->retval = pid; @@ -498,7 +495,7 @@ int __usermodehelper_disable(enum umh_disable_depth depth) static void helper_lock(void) { atomic_inc(&running_helpers); - smp_mb__after_atomic_inc(); + smp_mb__after_atomic(); } static void helper_unlock(void) diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c index 2495a9b14ac8..6683ccef9fff 100644 --- a/kernel/ksysfs.c +++ b/kernel/ksysfs.c @@ -37,6 +37,7 @@ static ssize_t uevent_seqnum_show(struct kobject *kobj, } KERNEL_ATTR_RO(uevent_seqnum); +#ifdef CONFIG_UEVENT_HELPER /* uevent helper program, used during early boot */ static ssize_t uevent_helper_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) @@ -56,7 +57,7 @@ static ssize_t uevent_helper_store(struct kobject *kobj, return count; } KERNEL_ATTR_RW(uevent_helper); - +#endif #ifdef CONFIG_PROFILING static ssize_t profiling_show(struct kobject *kobj, @@ -189,7 +190,9 @@ EXPORT_SYMBOL_GPL(kernel_kobj); static struct attribute * kernel_attrs[] = { &fscaps_attr.attr, &uevent_seqnum_attr.attr, +#ifdef CONFIG_UEVENT_HELPER &uevent_helper_attr.attr, +#endif #ifdef CONFIG_PROFILING &profiling_attr.attr, #endif diff --git a/kernel/kthread.c b/kernel/kthread.c index 9a130ec06f7a..c2390f41307b 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -262,7 +262,7 @@ static void create_kthread(struct kthread_create_info *create) * kthread_stop() has been called). The return value should be zero * or a negative error number; it will be passed to kthread_stop(). * - * Returns a task_struct or ERR_PTR(-ENOMEM). + * Returns a task_struct or ERR_PTR(-ENOMEM) or ERR_PTR(-EINTR). */ struct task_struct *kthread_create_on_node(int (*threadfn)(void *data), void *data, int node, @@ -298,7 +298,7 @@ struct task_struct *kthread_create_on_node(int (*threadfn)(void *data), * that thread. */ if (xchg(&create->done, NULL)) - return ERR_PTR(-ENOMEM); + return ERR_PTR(-EINTR); /* * kthreadd (or new kernel thread) will call complete() * shortly. diff --git a/kernel/latencytop.c b/kernel/latencytop.c index a462b317f9a0..a02812743a7e 100644 --- a/kernel/latencytop.c +++ b/kernel/latencytop.c @@ -88,7 +88,8 @@ static void clear_global_latency_tracing(void) } static void __sched -account_global_scheduler_latency(struct task_struct *tsk, struct latency_record *lat) +account_global_scheduler_latency(struct task_struct *tsk, + struct latency_record *lat) { int firstnonnull = MAXLR + 1; int i; @@ -255,7 +256,7 @@ static int lstats_show(struct seq_file *m, void *v) break; seq_printf(m, " %ps", (void *)bt); } - seq_printf(m, "\n"); + seq_puts(m, "\n"); } } return 0; diff --git a/kernel/locking/lockdep_internals.h b/kernel/locking/lockdep_internals.h index 4f560cfedc8f..51c4b24b6328 100644 --- a/kernel/locking/lockdep_internals.h +++ b/kernel/locking/lockdep_internals.h @@ -54,9 +54,9 @@ enum { * table (if it's not there yet), and we check it for lock order * conflicts and deadlocks. */ -#define MAX_LOCKDEP_ENTRIES 16384UL +#define MAX_LOCKDEP_ENTRIES 32768UL -#define MAX_LOCKDEP_CHAINS_BITS 15 +#define MAX_LOCKDEP_CHAINS_BITS 16 #define MAX_LOCKDEP_CHAINS (1UL << MAX_LOCKDEP_CHAINS_BITS) #define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5) @@ -65,7 +65,7 @@ enum { * Stack-trace: tightly packed array of stack backtrace * addresses. Protected by the hash_lock. */ -#define MAX_STACK_TRACE_ENTRIES 262144UL +#define MAX_STACK_TRACE_ENTRIES 524288UL extern struct list_head all_lock_classes; extern struct lock_chain lock_chains[]; diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c index f26b1a18e34e..0955b885d0dc 100644 --- a/kernel/locking/locktorture.c +++ b/kernel/locking/locktorture.c @@ -82,14 +82,14 @@ struct lock_writer_stress_stats { }; static struct lock_writer_stress_stats *lwsa; -#if defined(MODULE) || defined(CONFIG_LOCK_TORTURE_TEST_RUNNABLE) +#if defined(MODULE) #define LOCKTORTURE_RUNNABLE_INIT 1 #else #define LOCKTORTURE_RUNNABLE_INIT 0 #endif int locktorture_runnable = LOCKTORTURE_RUNNABLE_INIT; module_param(locktorture_runnable, int, 0444); -MODULE_PARM_DESC(locktorture_runnable, "Start locktorture at boot"); +MODULE_PARM_DESC(locktorture_runnable, "Start locktorture at module init"); /* Forward reference. */ static void lock_torture_cleanup(void); @@ -216,10 +216,11 @@ static int lock_torture_writer(void *arg) static DEFINE_TORTURE_RANDOM(rand); VERBOSE_TOROUT_STRING("lock_torture_writer task started"); - set_user_nice(current, 19); + set_user_nice(current, MAX_NICE); do { - schedule_timeout_uninterruptible(1); + if ((torture_random(&rand) & 0xfffff) == 0) + schedule_timeout_uninterruptible(1); cur_ops->writelock(); if (WARN_ON_ONCE(lock_is_write_held)) lwsp->n_write_lock_fail++; @@ -354,7 +355,8 @@ static int __init lock_torture_init(void) &lock_busted_ops, &spin_lock_ops, &spin_lock_irq_ops, }; - torture_init_begin(torture_type, verbose, &locktorture_runnable); + if (!torture_init_begin(torture_type, verbose, &locktorture_runnable)) + return -EBUSY; /* Process args and tell the world that the torturer is on the job. */ for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { diff --git a/kernel/locking/rwsem-xadd.c b/kernel/locking/rwsem-xadd.c index 1d66e08e897d..b4219ff87b8c 100644 --- a/kernel/locking/rwsem-xadd.c +++ b/kernel/locking/rwsem-xadd.c @@ -12,6 +12,55 @@ #include <linux/export.h> /* + * Guide to the rw_semaphore's count field for common values. + * (32-bit case illustrated, similar for 64-bit) + * + * 0x0000000X (1) X readers active or attempting lock, no writer waiting + * X = #active_readers + #readers attempting to lock + * (X*ACTIVE_BIAS) + * + * 0x00000000 rwsem is unlocked, and no one is waiting for the lock or + * attempting to read lock or write lock. + * + * 0xffff000X (1) X readers active or attempting lock, with waiters for lock + * X = #active readers + # readers attempting lock + * (X*ACTIVE_BIAS + WAITING_BIAS) + * (2) 1 writer attempting lock, no waiters for lock + * X-1 = #active readers + #readers attempting lock + * ((X-1)*ACTIVE_BIAS + ACTIVE_WRITE_BIAS) + * (3) 1 writer active, no waiters for lock + * X-1 = #active readers + #readers attempting lock + * ((X-1)*ACTIVE_BIAS + ACTIVE_WRITE_BIAS) + * + * 0xffff0001 (1) 1 reader active or attempting lock, waiters for lock + * (WAITING_BIAS + ACTIVE_BIAS) + * (2) 1 writer active or attempting lock, no waiters for lock + * (ACTIVE_WRITE_BIAS) + * + * 0xffff0000 (1) There are writers or readers queued but none active + * or in the process of attempting lock. + * (WAITING_BIAS) + * Note: writer can attempt to steal lock for this count by adding + * ACTIVE_WRITE_BIAS in cmpxchg and checking the old count + * + * 0xfffe0001 (1) 1 writer active, or attempting lock. Waiters on queue. + * (ACTIVE_WRITE_BIAS + WAITING_BIAS) + * + * Note: Readers attempt to lock by adding ACTIVE_BIAS in down_read and checking + * the count becomes more than 0 for successful lock acquisition, + * i.e. the case where there are only readers or nobody has lock. + * (1st and 2nd case above). + * + * Writers attempt to lock by adding ACTIVE_WRITE_BIAS in down_write and + * checking the count becomes ACTIVE_WRITE_BIAS for successful lock + * acquisition (i.e. nobody else has lock or attempts lock). If + * unsuccessful, in rwsem_down_write_failed, we'll check to see if there + * are only waiters but none active (5th case above), and attempt to + * steal the lock. + * + */ + +/* * Initialize an rwsem: */ void __init_rwsem(struct rw_semaphore *sem, const char *name, diff --git a/kernel/panic.c b/kernel/panic.c index d02fa9fef46a..62e16cef9cc2 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -32,6 +32,7 @@ static unsigned long tainted_mask; static int pause_on_oops; static int pause_on_oops_flag; static DEFINE_SPINLOCK(pause_on_oops_lock); +static bool crash_kexec_post_notifiers; int panic_timeout = CONFIG_PANIC_TIMEOUT; EXPORT_SYMBOL_GPL(panic_timeout); @@ -112,9 +113,11 @@ void panic(const char *fmt, ...) /* * If we have crashed and we have a crash kernel loaded let it handle * everything else. - * Do we want to call this before we try to display a message? + * If we want to run this after calling panic_notifiers, pass + * the "crash_kexec_post_notifiers" option to the kernel. */ - crash_kexec(NULL); + if (!crash_kexec_post_notifiers) + crash_kexec(NULL); /* * Note smp_send_stop is the usual smp shutdown function, which @@ -131,6 +134,15 @@ void panic(const char *fmt, ...) kmsg_dump(KMSG_DUMP_PANIC); + /* + * If you doubt kdump always works fine in any situation, + * "crash_kexec_post_notifiers" offers you a chance to run + * panic_notifiers and dumping kmsg before kdump. + * Note: since some panic_notifiers can make crashed kernel + * more unstable, it can increase risks of the kdump failure too. + */ + crash_kexec(NULL); + bust_spinlocks(0); if (!panic_blink) @@ -472,6 +484,13 @@ EXPORT_SYMBOL(__stack_chk_fail); core_param(panic, panic_timeout, int, 0644); core_param(pause_on_oops, pause_on_oops, int, 0644); +static int __init setup_crash_kexec_post_notifiers(char *s) +{ + crash_kexec_post_notifiers = true; + return 0; +} +early_param("crash_kexec_post_notifiers", setup_crash_kexec_post_notifiers); + static int __init oops_setup(char *s) { if (!s) diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig index 2fac9cc79b3d..9a83d780facd 100644 --- a/kernel/power/Kconfig +++ b/kernel/power/Kconfig @@ -257,8 +257,7 @@ config ARCH_HAS_OPP bool config PM_OPP - bool "Operating Performance Point (OPP) Layer library" - depends on ARCH_HAS_OPP + bool ---help--- SOCs have a standard set of tuples consisting of frequency and voltage pairs that the device will support per voltage domain. This diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index f4f2073711d3..df88d55dc436 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -35,7 +35,7 @@ static int nocompress; static int noresume; static int resume_wait; -static int resume_delay; +static unsigned int resume_delay; static char resume_file[256] = CONFIG_PM_STD_PARTITION; dev_t swsusp_resume_device; sector_t swsusp_resume_block; @@ -228,19 +228,23 @@ static void platform_recover(int platform_mode) void swsusp_show_speed(struct timeval *start, struct timeval *stop, unsigned nr_pages, char *msg) { - s64 elapsed_centisecs64; - int centisecs; - int k; - int kps; + u64 elapsed_centisecs64; + unsigned int centisecs; + unsigned int k; + unsigned int kps; elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start); + /* + * If "(s64)elapsed_centisecs64 < 0", it will print long elapsed time, + * it is obvious enough for what went wrong. + */ do_div(elapsed_centisecs64, NSEC_PER_SEC / 100); centisecs = elapsed_centisecs64; if (centisecs == 0) centisecs = 1; /* avoid div-by-zero */ k = nr_pages * (PAGE_SIZE / 1024); kps = (k * 100) / centisecs; - printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", + printk(KERN_INFO "PM: %s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n", msg, k, centisecs / 100, centisecs % 100, kps / 1000, (kps % 1000) / 10); @@ -595,7 +599,8 @@ static void power_down(void) case HIBERNATION_PLATFORM: hibernation_platform_enter(); case HIBERNATION_SHUTDOWN: - kernel_power_off(); + if (pm_power_off) + kernel_power_off(); break; #ifdef CONFIG_SUSPEND case HIBERNATION_SUSPEND: @@ -623,7 +628,8 @@ static void power_down(void) * corruption after resume. */ printk(KERN_CRIT "PM: Please power down manually\n"); - while(1); + while (1) + cpu_relax(); } /** @@ -1109,7 +1115,10 @@ static int __init resumewait_setup(char *str) static int __init resumedelay_setup(char *str) { - resume_delay = simple_strtoul(str, NULL, 0); + int rc = kstrtouint(str, 0, &resume_delay); + + if (rc) + return rc; return 1; } diff --git a/kernel/power/main.c b/kernel/power/main.c index 6271bc4073ef..573410d6647e 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -279,26 +279,26 @@ static inline void pm_print_times_init(void) {} struct kobject *power_kobj; /** - * state - control system power state. + * state - control system sleep states. * - * show() returns what states are supported, which is hard-coded to - * 'freeze' (Low-Power Idle), 'standby' (Power-On Suspend), - * 'mem' (Suspend-to-RAM), and 'disk' (Suspend-to-Disk). + * show() returns available sleep state labels, which may be "mem", "standby", + * "freeze" and "disk" (hibernation). See Documentation/power/states.txt for a + * description of what they mean. * - * store() accepts one of those strings, translates it into the - * proper enumerated value, and initiates a suspend transition. + * store() accepts one of those strings, translates it into the proper + * enumerated value, and initiates a suspend transition. */ static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { char *s = buf; #ifdef CONFIG_SUSPEND - int i; + suspend_state_t i; + + for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) + if (pm_states[i].state) + s += sprintf(s,"%s ", pm_states[i].label); - for (i = 0; i < PM_SUSPEND_MAX; i++) { - if (pm_states[i] && valid_state(i)) - s += sprintf(s,"%s ", pm_states[i]); - } #endif #ifdef CONFIG_HIBERNATION s += sprintf(s, "%s\n", "disk"); @@ -314,7 +314,7 @@ static suspend_state_t decode_state(const char *buf, size_t n) { #ifdef CONFIG_SUSPEND suspend_state_t state = PM_SUSPEND_MIN; - const char * const *s; + struct pm_sleep_state *s; #endif char *p; int len; @@ -328,8 +328,9 @@ static suspend_state_t decode_state(const char *buf, size_t n) #ifdef CONFIG_SUSPEND for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) - if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) - return state; + if (s->state && len == strlen(s->label) + && !strncmp(buf, s->label, len)) + return s->state; #endif return PM_SUSPEND_ON; @@ -447,8 +448,8 @@ static ssize_t autosleep_show(struct kobject *kobj, #ifdef CONFIG_SUSPEND if (state < PM_SUSPEND_MAX) - return sprintf(buf, "%s\n", valid_state(state) ? - pm_states[state] : "error"); + return sprintf(buf, "%s\n", pm_states[state].state ? + pm_states[state].label : "error"); #endif #ifdef CONFIG_HIBERNATION return sprintf(buf, "disk\n"); diff --git a/kernel/power/power.h b/kernel/power/power.h index 15f37ea08719..c60f13b5270a 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -178,17 +178,20 @@ extern void swsusp_show_speed(struct timeval *, struct timeval *, unsigned int, char *); #ifdef CONFIG_SUSPEND +struct pm_sleep_state { + const char *label; + suspend_state_t state; +}; + /* kernel/power/suspend.c */ -extern const char *const pm_states[]; +extern struct pm_sleep_state pm_states[]; -extern bool valid_state(suspend_state_t state); extern int suspend_devices_and_enter(suspend_state_t state); #else /* !CONFIG_SUSPEND */ static inline int suspend_devices_and_enter(suspend_state_t state) { return -ENOSYS; } -static inline bool valid_state(suspend_state_t state) { return false; } #endif /* !CONFIG_SUSPEND */ #ifdef CONFIG_PM_TEST_SUSPEND diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 8233cd4047d7..963e6d0f050b 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -31,13 +31,14 @@ #include "power.h" -const char *const pm_states[PM_SUSPEND_MAX] = { - [PM_SUSPEND_FREEZE] = "freeze", - [PM_SUSPEND_STANDBY] = "standby", - [PM_SUSPEND_MEM] = "mem", +struct pm_sleep_state pm_states[PM_SUSPEND_MAX] = { + [PM_SUSPEND_FREEZE] = { .label = "freeze", .state = PM_SUSPEND_FREEZE }, + [PM_SUSPEND_STANDBY] = { .label = "standby", }, + [PM_SUSPEND_MEM] = { .label = "mem", }, }; static const struct platform_suspend_ops *suspend_ops; +static const struct platform_freeze_ops *freeze_ops; static bool need_suspend_ops(suspend_state_t state) { @@ -47,6 +48,13 @@ static bool need_suspend_ops(suspend_state_t state) static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head); static bool suspend_freeze_wake; +void freeze_set_ops(const struct platform_freeze_ops *ops) +{ + lock_system_sleep(); + freeze_ops = ops; + unlock_system_sleep(); +} + static void freeze_begin(void) { suspend_freeze_wake = false; @@ -54,9 +62,11 @@ static void freeze_begin(void) static void freeze_enter(void) { + cpuidle_use_deepest_state(true); cpuidle_resume(); wait_event(suspend_freeze_wait_head, suspend_freeze_wake); cpuidle_pause(); + cpuidle_use_deepest_state(false); } void freeze_wake(void) @@ -66,42 +76,62 @@ void freeze_wake(void) } EXPORT_SYMBOL_GPL(freeze_wake); +static bool valid_state(suspend_state_t state) +{ + /* + * PM_SUSPEND_STANDBY and PM_SUSPEND_MEM states need low level + * support and need to be valid to the low level + * implementation, no valid callback implies that none are valid. + */ + return suspend_ops && suspend_ops->valid && suspend_ops->valid(state); +} + +/* + * If this is set, the "mem" label always corresponds to the deepest sleep state + * available, the "standby" label corresponds to the second deepest sleep state + * available (if any), and the "freeze" label corresponds to the remaining + * available sleep state (if there is one). + */ +static bool relative_states; + +static int __init sleep_states_setup(char *str) +{ + relative_states = !strncmp(str, "1", 1); + if (relative_states) { + pm_states[PM_SUSPEND_MEM].state = PM_SUSPEND_FREEZE; + pm_states[PM_SUSPEND_FREEZE].state = 0; + } + return 1; +} + +__setup("relative_sleep_states=", sleep_states_setup); + /** * suspend_set_ops - Set the global suspend method table. * @ops: Suspend operations to use. */ void suspend_set_ops(const struct platform_suspend_ops *ops) { + suspend_state_t i; + int j = PM_SUSPEND_MAX - 1; + lock_system_sleep(); + suspend_ops = ops; + for (i = PM_SUSPEND_MEM; i >= PM_SUSPEND_STANDBY; i--) + if (valid_state(i)) + pm_states[j--].state = i; + else if (!relative_states) + pm_states[j--].state = 0; + + pm_states[j--].state = PM_SUSPEND_FREEZE; + while (j >= PM_SUSPEND_MIN) + pm_states[j--].state = 0; + unlock_system_sleep(); } EXPORT_SYMBOL_GPL(suspend_set_ops); -bool valid_state(suspend_state_t state) -{ - if (state == PM_SUSPEND_FREEZE) { -#ifdef CONFIG_PM_DEBUG - if (pm_test_level != TEST_NONE && - pm_test_level != TEST_FREEZER && - pm_test_level != TEST_DEVICES && - pm_test_level != TEST_PLATFORM) { - printk(KERN_WARNING "Unsupported pm_test mode for " - "freeze state, please choose " - "none/freezer/devices/platform.\n"); - return false; - } -#endif - return true; - } - /* - * PM_SUSPEND_STANDBY and PM_SUSPEND_MEMORY states need lowlevel - * support and need to be valid to the lowlevel - * implementation, no valid callback implies that none are valid. - */ - return suspend_ops && suspend_ops->valid && suspend_ops->valid(state); -} - /** * suspend_valid_only_mem - Generic memory-only valid callback. * @@ -269,6 +299,10 @@ int suspend_devices_and_enter(suspend_state_t state) error = suspend_ops->begin(state); if (error) goto Close; + } else if (state == PM_SUSPEND_FREEZE && freeze_ops->begin) { + error = freeze_ops->begin(); + if (error) + goto Close; } suspend_console(); suspend_test_start(); @@ -294,6 +328,9 @@ int suspend_devices_and_enter(suspend_state_t state) Close: if (need_suspend_ops(state) && suspend_ops->end) suspend_ops->end(); + else if (state == PM_SUSPEND_FREEZE && freeze_ops->end) + freeze_ops->end(); + trace_machine_suspend(PWR_EVENT_EXIT); return error; @@ -328,9 +365,17 @@ static int enter_state(suspend_state_t state) { int error; - if (!valid_state(state)) - return -ENODEV; - + if (state == PM_SUSPEND_FREEZE) { +#ifdef CONFIG_PM_DEBUG + if (pm_test_level != TEST_NONE && pm_test_level <= TEST_CPUS) { + pr_warning("PM: Unsupported test mode for freeze state," + "please choose none/freezer/devices/platform.\n"); + return -EAGAIN; + } +#endif + } else if (!valid_state(state)) { + return -EINVAL; + } if (!mutex_trylock(&pm_mutex)) return -EBUSY; @@ -341,7 +386,7 @@ static int enter_state(suspend_state_t state) sys_sync(); printk("done.\n"); - pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]); + pr_debug("PM: Preparing system for %s sleep\n", pm_states[state].label); error = suspend_prepare(state); if (error) goto Unlock; @@ -349,7 +394,7 @@ static int enter_state(suspend_state_t state) if (suspend_test(TEST_FREEZER)) goto Finish; - pr_debug("PM: Entering %s sleep\n", pm_states[state]); + pr_debug("PM: Entering %s sleep\n", pm_states[state].label); pm_restrict_gfp_mask(); error = suspend_devices_and_enter(state); pm_restore_gfp_mask(); diff --git a/kernel/power/suspend_test.c b/kernel/power/suspend_test.c index 9b2a1d58558d..269b097e78ea 100644 --- a/kernel/power/suspend_test.c +++ b/kernel/power/suspend_test.c @@ -92,13 +92,13 @@ static void __init test_wakealarm(struct rtc_device *rtc, suspend_state_t state) } if (state == PM_SUSPEND_MEM) { - printk(info_test, pm_states[state]); + printk(info_test, pm_states[state].label); status = pm_suspend(state); if (status == -ENODEV) state = PM_SUSPEND_STANDBY; } if (state == PM_SUSPEND_STANDBY) { - printk(info_test, pm_states[state]); + printk(info_test, pm_states[state].label); status = pm_suspend(state); } if (status < 0) @@ -136,18 +136,16 @@ static char warn_bad_state[] __initdata = static int __init setup_test_suspend(char *value) { - unsigned i; + suspend_state_t i; /* "=mem" ==> "mem" */ value++; - for (i = 0; i < PM_SUSPEND_MAX; i++) { - if (!pm_states[i]) - continue; - if (strcmp(pm_states[i], value) != 0) - continue; - test_state = (__force suspend_state_t) i; - return 0; - } + for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) + if (!strcmp(pm_states[i].label, value)) { + test_state = pm_states[i].state; + return 0; + } + printk(warn_bad_state, value); return 0; } @@ -164,8 +162,8 @@ static int __init test_suspend(void) /* PM is initialized by now; is that state testable? */ if (test_state == PM_SUSPEND_ON) goto done; - if (!valid_state(test_state)) { - printk(warn_bad_state, pm_states[test_state]); + if (!pm_states[test_state].state) { + printk(warn_bad_state, pm_states[test_state].label); goto done; } diff --git a/kernel/power/swap.c b/kernel/power/swap.c index 8c9a4819f798..aaa3261dea5d 100644 --- a/kernel/power/swap.c +++ b/kernel/power/swap.c @@ -567,7 +567,7 @@ static int lzo_compress_threadfn(void *data) /** * save_image_lzo - Save the suspend image data compressed with LZO. - * @handle: Swap mam handle to use for saving the image. + * @handle: Swap map handle to use for saving the image. * @snapshot: Image to read data from. * @nr_to_write: Number of pages to save. */ diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 7228258b85ec..ea2d5f6962ed 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -54,20 +54,16 @@ #include "console_cmdline.h" #include "braille.h" -/* printk's without a loglevel use this.. */ -#define DEFAULT_MESSAGE_LOGLEVEL CONFIG_DEFAULT_MESSAGE_LOGLEVEL - -/* We show everything that is MORE important than this.. */ -#define MINIMUM_CONSOLE_LOGLEVEL 1 /* Minimum loglevel we let people use */ -#define DEFAULT_CONSOLE_LOGLEVEL 7 /* anything MORE serious than KERN_DEBUG */ - int console_printk[4] = { - DEFAULT_CONSOLE_LOGLEVEL, /* console_loglevel */ + CONSOLE_LOGLEVEL_DEFAULT, /* console_loglevel */ DEFAULT_MESSAGE_LOGLEVEL, /* default_message_loglevel */ - MINIMUM_CONSOLE_LOGLEVEL, /* minimum_console_loglevel */ - DEFAULT_CONSOLE_LOGLEVEL, /* default_console_loglevel */ + CONSOLE_LOGLEVEL_MIN, /* minimum_console_loglevel */ + CONSOLE_LOGLEVEL_DEFAULT, /* default_console_loglevel */ }; +/* Deferred messaged from sched code are marked by this special level */ +#define SCHED_MESSAGE_LOGLEVEL -2 + /* * Low level drivers may need that to know if they can schedule in * their unblank() callback or not. So let's export it. @@ -91,6 +87,29 @@ static struct lockdep_map console_lock_dep_map = { #endif /* + * Helper macros to handle lockdep when locking/unlocking console_sem. We use + * macros instead of functions so that _RET_IP_ contains useful information. + */ +#define down_console_sem() do { \ + down(&console_sem);\ + mutex_acquire(&console_lock_dep_map, 0, 0, _RET_IP_);\ +} while (0) + +static int __down_trylock_console_sem(unsigned long ip) +{ + if (down_trylock(&console_sem)) + return 1; + mutex_acquire(&console_lock_dep_map, 0, 1, ip); + return 0; +} +#define down_trylock_console_sem() __down_trylock_console_sem(_RET_IP_) + +#define up_console_sem() do { \ + mutex_release(&console_lock_dep_map, 1, _RET_IP_);\ + up(&console_sem);\ +} while (0) + +/* * This is used for debugging the mess that is the VT code by * keeping track if we have the console semaphore held. It's * definitely not the perfect debug tool (we don't know if _WE_ @@ -206,8 +225,9 @@ struct printk_log { }; /* - * The logbuf_lock protects kmsg buffer, indices, counters. It is also - * used in interesting ways to provide interlocking in console_unlock(); + * The logbuf_lock protects kmsg buffer, indices, counters. This can be taken + * within the scheduler's rq lock. It must be released before calling + * console_unlock() or anything else that might wake up a process. */ static DEFINE_RAW_SPINLOCK(logbuf_lock); @@ -250,9 +270,6 @@ static char __log_buf[__LOG_BUF_LEN] __aligned(LOG_ALIGN); static char *log_buf = __log_buf; static u32 log_buf_len = __LOG_BUF_LEN; -/* cpu currently holding logbuf_lock */ -static volatile unsigned int logbuf_cpu = UINT_MAX; - /* human readable text of the record */ static char *log_text(const struct printk_log *msg) { @@ -297,34 +314,106 @@ static u32 log_next(u32 idx) return idx + msg->len; } -/* insert record into the buffer, discard old ones, update heads */ -static void log_store(int facility, int level, - enum log_flags flags, u64 ts_nsec, - const char *dict, u16 dict_len, - const char *text, u16 text_len) +/* + * Check whether there is enough free space for the given message. + * + * The same values of first_idx and next_idx mean that the buffer + * is either empty or full. + * + * If the buffer is empty, we must respect the position of the indexes. + * They cannot be reset to the beginning of the buffer. + */ +static int logbuf_has_space(u32 msg_size, bool empty) { - struct printk_log *msg; - u32 size, pad_len; + u32 free; - /* number of '\0' padding bytes to next message */ - size = sizeof(struct printk_log) + text_len + dict_len; - pad_len = (-size) & (LOG_ALIGN - 1); - size += pad_len; + if (log_next_idx > log_first_idx || empty) + free = max(log_buf_len - log_next_idx, log_first_idx); + else + free = log_first_idx - log_next_idx; + + /* + * We need space also for an empty header that signalizes wrapping + * of the buffer. + */ + return free >= msg_size + sizeof(struct printk_log); +} +static int log_make_free_space(u32 msg_size) +{ while (log_first_seq < log_next_seq) { - u32 free; + if (logbuf_has_space(msg_size, false)) + return 0; + /* drop old messages until we have enough continuous space */ + log_first_idx = log_next(log_first_idx); + log_first_seq++; + } - if (log_next_idx > log_first_idx) - free = max(log_buf_len - log_next_idx, log_first_idx); - else - free = log_first_idx - log_next_idx; + /* sequence numbers are equal, so the log buffer is empty */ + if (logbuf_has_space(msg_size, true)) + return 0; - if (free >= size + sizeof(struct printk_log)) - break; + return -ENOMEM; +} - /* drop old messages until we have enough contiuous space */ - log_first_idx = log_next(log_first_idx); - log_first_seq++; +/* compute the message size including the padding bytes */ +static u32 msg_used_size(u16 text_len, u16 dict_len, u32 *pad_len) +{ + u32 size; + + size = sizeof(struct printk_log) + text_len + dict_len; + *pad_len = (-size) & (LOG_ALIGN - 1); + size += *pad_len; + + return size; +} + +/* + * Define how much of the log buffer we could take at maximum. The value + * must be greater than two. Note that only half of the buffer is available + * when the index points to the middle. + */ +#define MAX_LOG_TAKE_PART 4 +static const char trunc_msg[] = "<truncated>"; + +static u32 truncate_msg(u16 *text_len, u16 *trunc_msg_len, + u16 *dict_len, u32 *pad_len) +{ + /* + * The message should not take the whole buffer. Otherwise, it might + * get removed too soon. + */ + u32 max_text_len = log_buf_len / MAX_LOG_TAKE_PART; + if (*text_len > max_text_len) + *text_len = max_text_len; + /* enable the warning message */ + *trunc_msg_len = strlen(trunc_msg); + /* disable the "dict" completely */ + *dict_len = 0; + /* compute the size again, count also the warning message */ + return msg_used_size(*text_len + *trunc_msg_len, 0, pad_len); +} + +/* insert record into the buffer, discard old ones, update heads */ +static int log_store(int facility, int level, + enum log_flags flags, u64 ts_nsec, + const char *dict, u16 dict_len, + const char *text, u16 text_len) +{ + struct printk_log *msg; + u32 size, pad_len; + u16 trunc_msg_len = 0; + + /* number of '\0' padding bytes to next message */ + size = msg_used_size(text_len, dict_len, &pad_len); + + if (log_make_free_space(size)) { + /* truncate the message if it is too long for empty buffer */ + size = truncate_msg(&text_len, &trunc_msg_len, + &dict_len, &pad_len); + /* survive when the log buffer is too small for trunc_msg */ + if (log_make_free_space(size)) + return 0; } if (log_next_idx + size + sizeof(struct printk_log) > log_buf_len) { @@ -341,6 +430,10 @@ static void log_store(int facility, int level, msg = (struct printk_log *)(log_buf + log_next_idx); memcpy(log_text(msg), text, text_len); msg->text_len = text_len; + if (trunc_msg_len) { + memcpy(log_text(msg) + text_len, trunc_msg, trunc_msg_len); + msg->text_len += trunc_msg_len; + } memcpy(log_dict(msg), dict, dict_len); msg->dict_len = dict_len; msg->facility = facility; @@ -356,6 +449,8 @@ static void log_store(int facility, int level, /* insert message */ log_next_idx += msg->len; log_next_seq++; + + return msg->text_len; } #ifdef CONFIG_SECURITY_DMESG_RESTRICT @@ -1303,7 +1398,10 @@ static void zap_locks(void) sema_init(&console_sem, 1); } -/* Check if we have any console registered that can be called early in boot. */ +/* + * Check if we have any console that is capable of printing while cpu is + * booting or shutting down. Requires console_sem. + */ static int have_callable_console(void) { struct console *con; @@ -1318,10 +1416,9 @@ static int have_callable_console(void) /* * Can we actually use the console at this time on this cpu? * - * Console drivers may assume that per-cpu resources have - * been allocated. So unless they're explicitly marked as - * being able to cope (CON_ANYTIME) don't call them until - * this CPU is officially up. + * Console drivers may assume that per-cpu resources have been allocated. So + * unless they're explicitly marked as being able to cope (CON_ANYTIME) don't + * call them until this CPU is officially up. */ static inline int can_use_console(unsigned int cpu) { @@ -1333,36 +1430,24 @@ static inline int can_use_console(unsigned int cpu) * messages from a 'printk'. Return true (and with the * console_lock held, and 'console_locked' set) if it * is successful, false otherwise. - * - * This gets called with the 'logbuf_lock' spinlock held and - * interrupts disabled. It should return with 'lockbuf_lock' - * released but interrupts still disabled. */ -static int console_trylock_for_printk(unsigned int cpu) - __releases(&logbuf_lock) +static int console_trylock_for_printk(void) { - int retval = 0, wake = 0; + unsigned int cpu = smp_processor_id(); - if (console_trylock()) { - retval = 1; - - /* - * If we can't use the console, we need to release - * the console semaphore by hand to avoid flushing - * the buffer. We need to hold the console semaphore - * in order to do this test safely. - */ - if (!can_use_console(cpu)) { - console_locked = 0; - wake = 1; - retval = 0; - } + if (!console_trylock()) + return 0; + /* + * If we can't use the console, we need to release the console + * semaphore by hand to avoid flushing the buffer. We need to hold the + * console semaphore in order to do this test safely. + */ + if (!can_use_console(cpu)) { + console_locked = 0; + up_console_sem(); + return 0; } - logbuf_cpu = UINT_MAX; - raw_spin_unlock(&logbuf_lock); - if (wake) - up(&console_sem); - return retval; + return 1; } int printk_delay_msec __read_mostly; @@ -1490,11 +1575,19 @@ asmlinkage int vprintk_emit(int facility, int level, static int recursion_bug; static char textbuf[LOG_LINE_MAX]; char *text = textbuf; - size_t text_len; + size_t text_len = 0; enum log_flags lflags = 0; unsigned long flags; int this_cpu; int printed_len = 0; + bool in_sched = false; + /* cpu currently holding logbuf_lock in this function */ + static volatile unsigned int logbuf_cpu = UINT_MAX; + + if (level == SCHED_MESSAGE_LOGLEVEL) { + level = -1; + in_sched = true; + } boot_delay_msec(level); printk_delay(); @@ -1516,7 +1609,8 @@ asmlinkage int vprintk_emit(int facility, int level, */ if (!oops_in_progress && !lockdep_recursing(current)) { recursion_bug = 1; - goto out_restore_irqs; + local_irq_restore(flags); + return 0; } zap_locks(); } @@ -1530,17 +1624,22 @@ asmlinkage int vprintk_emit(int facility, int level, "BUG: recent printk recursion!"; recursion_bug = 0; - printed_len += strlen(recursion_msg); + text_len = strlen(recursion_msg); /* emit KERN_CRIT message */ - log_store(0, 2, LOG_PREFIX|LOG_NEWLINE, 0, - NULL, 0, recursion_msg, printed_len); + printed_len += log_store(0, 2, LOG_PREFIX|LOG_NEWLINE, 0, + NULL, 0, recursion_msg, text_len); } /* * The printf needs to come first; we need the syslog * prefix which might be passed-in as a parameter. */ - text_len = vscnprintf(text, sizeof(textbuf), fmt, args); + if (in_sched) + text_len = scnprintf(text, sizeof(textbuf), + KERN_WARNING "[sched_delayed] "); + + text_len += vscnprintf(text + text_len, + sizeof(textbuf) - text_len, fmt, args); /* mark and strip a trailing newline */ if (text_len && text[text_len-1] == '\n') { @@ -1586,9 +1685,12 @@ asmlinkage int vprintk_emit(int facility, int level, cont_flush(LOG_NEWLINE); /* buffer line if possible, otherwise store it right away */ - if (!cont_add(facility, level, text, text_len)) - log_store(facility, level, lflags | LOG_CONT, 0, - dict, dictlen, text, text_len); + if (cont_add(facility, level, text, text_len)) + printed_len += text_len; + else + printed_len += log_store(facility, level, + lflags | LOG_CONT, 0, + dict, dictlen, text, text_len); } else { bool stored = false; @@ -1607,26 +1709,35 @@ asmlinkage int vprintk_emit(int facility, int level, cont_flush(LOG_NEWLINE); } - if (!stored) - log_store(facility, level, lflags, 0, - dict, dictlen, text, text_len); + if (stored) + printed_len += text_len; + else + printed_len += log_store(facility, level, lflags, 0, + dict, dictlen, text, text_len); } - printed_len += text_len; + + logbuf_cpu = UINT_MAX; + raw_spin_unlock(&logbuf_lock); + lockdep_on(); + local_irq_restore(flags); + + /* If called from the scheduler, we can not call up(). */ + if (in_sched) + return printed_len; /* + * Disable preemption to avoid being preempted while holding + * console_sem which would prevent anyone from printing to console + */ + preempt_disable(); + /* * Try to acquire and then immediately release the console semaphore. * The release will print out buffers and wake up /dev/kmsg and syslog() * users. - * - * The console_trylock_for_printk() function will release 'logbuf_lock' - * regardless of whether it actually gets the console semaphore or not. */ - if (console_trylock_for_printk(this_cpu)) + if (console_trylock_for_printk()) console_unlock(); - - lockdep_on(); -out_restore_irqs: - local_irq_restore(flags); + preempt_enable(); return printed_len; } @@ -1882,16 +1993,14 @@ void suspend_console(void) printk("Suspending console(s) (use no_console_suspend to debug)\n"); console_lock(); console_suspended = 1; - up(&console_sem); - mutex_release(&console_lock_dep_map, 1, _RET_IP_); + up_console_sem(); } void resume_console(void) { if (!console_suspend_enabled) return; - down(&console_sem); - mutex_acquire(&console_lock_dep_map, 0, 0, _RET_IP_); + down_console_sem(); console_suspended = 0; console_unlock(); } @@ -1933,12 +2042,11 @@ void console_lock(void) { might_sleep(); - down(&console_sem); + down_console_sem(); if (console_suspended) return; console_locked = 1; console_may_schedule = 1; - mutex_acquire(&console_lock_dep_map, 0, 0, _RET_IP_); } EXPORT_SYMBOL(console_lock); @@ -1952,15 +2060,14 @@ EXPORT_SYMBOL(console_lock); */ int console_trylock(void) { - if (down_trylock(&console_sem)) + if (down_trylock_console_sem()) return 0; if (console_suspended) { - up(&console_sem); + up_console_sem(); return 0; } console_locked = 1; console_may_schedule = 0; - mutex_acquire(&console_lock_dep_map, 0, 1, _RET_IP_); return 1; } EXPORT_SYMBOL(console_trylock); @@ -2022,7 +2129,7 @@ void console_unlock(void) bool retry; if (console_suspended) { - up(&console_sem); + up_console_sem(); return; } @@ -2043,10 +2150,15 @@ again: } if (console_seq < log_first_seq) { + len = sprintf(text, "** %u printk messages dropped ** ", + (unsigned)(log_first_seq - console_seq)); + /* messages are gone, move to first one */ console_seq = log_first_seq; console_idx = log_first_idx; console_prev = 0; + } else { + len = 0; } skip: if (console_seq == log_next_seq) @@ -2071,8 +2183,8 @@ skip: } level = msg->level; - len = msg_print_text(msg, console_prev, false, - text, sizeof(text)); + len += msg_print_text(msg, console_prev, false, + text + len, sizeof(text) - len); console_idx = log_next(console_idx); console_seq++; console_prev = msg->flags; @@ -2084,7 +2196,6 @@ skip: local_irq_restore(flags); } console_locked = 0; - mutex_release(&console_lock_dep_map, 1, _RET_IP_); /* Release the exclusive_console once it is used */ if (unlikely(exclusive_console)) @@ -2092,7 +2203,7 @@ skip: raw_spin_unlock(&logbuf_lock); - up(&console_sem); + up_console_sem(); /* * Someone could have filled up the buffer again, so re-check if there's @@ -2137,7 +2248,7 @@ void console_unblank(void) * oops_in_progress is set to 1.. */ if (oops_in_progress) { - if (down_trylock(&console_sem) != 0) + if (down_trylock_console_sem() != 0) return; } else console_lock(); @@ -2413,6 +2524,7 @@ int unregister_console(struct console *console) if (console_drivers != NULL && console->flags & CON_CONSDEV) console_drivers->flags |= CON_CONSDEV; + console->flags &= ~CON_ENABLED; console_unlock(); console_sysfs_notify(); return res; @@ -2437,21 +2549,19 @@ late_initcall(printk_late_init); /* * Delayed printk version, for scheduler-internal messages: */ -#define PRINTK_BUF_SIZE 512 - #define PRINTK_PENDING_WAKEUP 0x01 -#define PRINTK_PENDING_SCHED 0x02 +#define PRINTK_PENDING_OUTPUT 0x02 static DEFINE_PER_CPU(int, printk_pending); -static DEFINE_PER_CPU(char [PRINTK_BUF_SIZE], printk_sched_buf); static void wake_up_klogd_work_func(struct irq_work *irq_work) { int pending = __this_cpu_xchg(printk_pending, 0); - if (pending & PRINTK_PENDING_SCHED) { - char *buf = __get_cpu_var(printk_sched_buf); - pr_warn("[sched_delayed] %s", buf); + if (pending & PRINTK_PENDING_OUTPUT) { + /* If trylock fails, someone else is doing the printing */ + if (console_trylock()) + console_unlock(); } if (pending & PRINTK_PENDING_WAKEUP) @@ -2473,23 +2583,19 @@ void wake_up_klogd(void) preempt_enable(); } -int printk_sched(const char *fmt, ...) +int printk_deferred(const char *fmt, ...) { - unsigned long flags; va_list args; - char *buf; int r; - local_irq_save(flags); - buf = __get_cpu_var(printk_sched_buf); - + preempt_disable(); va_start(args, fmt); - r = vsnprintf(buf, PRINTK_BUF_SIZE, fmt, args); + r = vprintk_emit(0, SCHED_MESSAGE_LOGLEVEL, NULL, 0, fmt, args); va_end(args); - __this_cpu_or(printk_pending, PRINTK_PENDING_SCHED); + __this_cpu_or(printk_pending, PRINTK_PENDING_OUTPUT); irq_work_queue(&__get_cpu_var(wake_up_klogd_work)); - local_irq_restore(flags); + preempt_enable(); return r; } diff --git a/kernel/profile.c b/kernel/profile.c index cb980f0c731b..54bf5ba26420 100644 --- a/kernel/profile.c +++ b/kernel/profile.c @@ -52,9 +52,9 @@ static DEFINE_MUTEX(profile_flip_mutex); int profile_setup(char *str) { - static char schedstr[] = "schedule"; - static char sleepstr[] = "sleep"; - static char kvmstr[] = "kvm"; + static const char schedstr[] = "schedule"; + static const char sleepstr[] = "sleep"; + static const char kvmstr[] = "kvm"; int par; if (!strncmp(str, sleepstr, strlen(sleepstr))) { @@ -64,12 +64,10 @@ int profile_setup(char *str) str += strlen(sleepstr) + 1; if (get_option(&str, &par)) prof_shift = par; - printk(KERN_INFO - "kernel sleep profiling enabled (shift: %ld)\n", + pr_info("kernel sleep profiling enabled (shift: %ld)\n", prof_shift); #else - printk(KERN_WARNING - "kernel sleep profiling requires CONFIG_SCHEDSTATS\n"); + pr_warn("kernel sleep profiling requires CONFIG_SCHEDSTATS\n"); #endif /* CONFIG_SCHEDSTATS */ } else if (!strncmp(str, schedstr, strlen(schedstr))) { prof_on = SCHED_PROFILING; @@ -77,8 +75,7 @@ int profile_setup(char *str) str += strlen(schedstr) + 1; if (get_option(&str, &par)) prof_shift = par; - printk(KERN_INFO - "kernel schedule profiling enabled (shift: %ld)\n", + pr_info("kernel schedule profiling enabled (shift: %ld)\n", prof_shift); } else if (!strncmp(str, kvmstr, strlen(kvmstr))) { prof_on = KVM_PROFILING; @@ -86,13 +83,12 @@ int profile_setup(char *str) str += strlen(kvmstr) + 1; if (get_option(&str, &par)) prof_shift = par; - printk(KERN_INFO - "kernel KVM profiling enabled (shift: %ld)\n", + pr_info("kernel KVM profiling enabled (shift: %ld)\n", prof_shift); } else if (get_option(&str, &par)) { prof_shift = par; prof_on = CPU_PROFILING; - printk(KERN_INFO "kernel profiling enabled (shift: %ld)\n", + pr_info("kernel profiling enabled (shift: %ld)\n", prof_shift); } return 1; diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index bd30bc61bc05..7fa34f86e5ba 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -58,9 +58,11 @@ torture_param(int, fqs_duration, 0, "Duration of fqs bursts (us), 0 to disable"); torture_param(int, fqs_holdoff, 0, "Holdoff time within fqs bursts (us)"); torture_param(int, fqs_stutter, 3, "Wait time between fqs bursts (s)"); +torture_param(bool, gp_cond, false, "Use conditional/async GP wait primitives"); torture_param(bool, gp_exp, false, "Use expedited GP wait primitives"); torture_param(bool, gp_normal, false, "Use normal (non-expedited) GP wait primitives"); +torture_param(bool, gp_sync, false, "Use synchronous GP wait primitives"); torture_param(int, irqreader, 1, "Allow RCU readers from irq handlers"); torture_param(int, n_barrier_cbs, 0, "# of callbacks/kthreads for barrier testing"); @@ -138,6 +140,18 @@ static long n_barrier_attempts; static long n_barrier_successes; static struct list_head rcu_torture_removed; +static int rcu_torture_writer_state; +#define RTWS_FIXED_DELAY 0 +#define RTWS_DELAY 1 +#define RTWS_REPLACE 2 +#define RTWS_DEF_FREE 3 +#define RTWS_EXP_SYNC 4 +#define RTWS_COND_GET 5 +#define RTWS_COND_SYNC 6 +#define RTWS_SYNC 7 +#define RTWS_STUTTER 8 +#define RTWS_STOPPING 9 + #if defined(MODULE) || defined(CONFIG_RCU_TORTURE_TEST_RUNNABLE) #define RCUTORTURE_RUNNABLE_INIT 1 #else @@ -214,6 +228,7 @@ rcu_torture_free(struct rcu_torture *p) */ struct rcu_torture_ops { + int ttype; void (*init)(void); int (*readlock)(void); void (*read_delay)(struct torture_random_state *rrsp); @@ -222,6 +237,8 @@ struct rcu_torture_ops { void (*deferred_free)(struct rcu_torture *p); void (*sync)(void); void (*exp_sync)(void); + unsigned long (*get_state)(void); + void (*cond_sync)(unsigned long oldstate); void (*call)(struct rcu_head *head, void (*func)(struct rcu_head *rcu)); void (*cb_barrier)(void); void (*fqs)(void); @@ -273,10 +290,48 @@ static int rcu_torture_completed(void) return rcu_batches_completed(); } +/* + * Update callback in the pipe. This should be invoked after a grace period. + */ +static bool +rcu_torture_pipe_update_one(struct rcu_torture *rp) +{ + int i; + + i = rp->rtort_pipe_count; + if (i > RCU_TORTURE_PIPE_LEN) + i = RCU_TORTURE_PIPE_LEN; + atomic_inc(&rcu_torture_wcount[i]); + if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { + rp->rtort_mbtest = 0; + return true; + } + return false; +} + +/* + * Update all callbacks in the pipe. Suitable for synchronous grace-period + * primitives. + */ +static void +rcu_torture_pipe_update(struct rcu_torture *old_rp) +{ + struct rcu_torture *rp; + struct rcu_torture *rp1; + + if (old_rp) + list_add(&old_rp->rtort_free, &rcu_torture_removed); + list_for_each_entry_safe(rp, rp1, &rcu_torture_removed, rtort_free) { + if (rcu_torture_pipe_update_one(rp)) { + list_del(&rp->rtort_free); + rcu_torture_free(rp); + } + } +} + static void rcu_torture_cb(struct rcu_head *p) { - int i; struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); if (torture_must_stop_irq()) { @@ -284,16 +339,10 @@ rcu_torture_cb(struct rcu_head *p) /* The next initialization will pick up the pieces. */ return; } - i = rp->rtort_pipe_count; - if (i > RCU_TORTURE_PIPE_LEN) - i = RCU_TORTURE_PIPE_LEN; - atomic_inc(&rcu_torture_wcount[i]); - if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { - rp->rtort_mbtest = 0; + if (rcu_torture_pipe_update_one(rp)) rcu_torture_free(rp); - } else { + else cur_ops->deferred_free(rp); - } } static int rcu_no_completed(void) @@ -312,6 +361,7 @@ static void rcu_sync_torture_init(void) } static struct rcu_torture_ops rcu_ops = { + .ttype = RCU_FLAVOR, .init = rcu_sync_torture_init, .readlock = rcu_torture_read_lock, .read_delay = rcu_read_delay, @@ -320,6 +370,8 @@ static struct rcu_torture_ops rcu_ops = { .deferred_free = rcu_torture_deferred_free, .sync = synchronize_rcu, .exp_sync = synchronize_rcu_expedited, + .get_state = get_state_synchronize_rcu, + .cond_sync = cond_synchronize_rcu, .call = call_rcu, .cb_barrier = rcu_barrier, .fqs = rcu_force_quiescent_state, @@ -355,6 +407,7 @@ static void rcu_bh_torture_deferred_free(struct rcu_torture *p) } static struct rcu_torture_ops rcu_bh_ops = { + .ttype = RCU_BH_FLAVOR, .init = rcu_sync_torture_init, .readlock = rcu_bh_torture_read_lock, .read_delay = rcu_read_delay, /* just reuse rcu's version. */ @@ -397,6 +450,7 @@ call_rcu_busted(struct rcu_head *head, void (*func)(struct rcu_head *rcu)) } static struct rcu_torture_ops rcu_busted_ops = { + .ttype = INVALID_RCU_FLAVOR, .init = rcu_sync_torture_init, .readlock = rcu_torture_read_lock, .read_delay = rcu_read_delay, /* just reuse rcu's version. */ @@ -479,9 +533,11 @@ static void srcu_torture_stats(char *page) page += sprintf(page, "%s%s per-CPU(idx=%d):", torture_type, TORTURE_FLAG, idx); for_each_possible_cpu(cpu) { - page += sprintf(page, " %d(%lu,%lu)", cpu, - per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[!idx], - per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[idx]); + long c0, c1; + + c0 = (long)per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[!idx]; + c1 = (long)per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[idx]; + page += sprintf(page, " %d(%ld,%ld)", cpu, c0, c1); } sprintf(page, "\n"); } @@ -492,6 +548,7 @@ static void srcu_torture_synchronize_expedited(void) } static struct rcu_torture_ops srcu_ops = { + .ttype = SRCU_FLAVOR, .init = rcu_sync_torture_init, .readlock = srcu_torture_read_lock, .read_delay = srcu_read_delay, @@ -527,6 +584,7 @@ static void rcu_sched_torture_deferred_free(struct rcu_torture *p) } static struct rcu_torture_ops sched_ops = { + .ttype = RCU_SCHED_FLAVOR, .init = rcu_sync_torture_init, .readlock = sched_torture_read_lock, .read_delay = rcu_read_delay, /* just reuse rcu's version. */ @@ -688,23 +746,59 @@ rcu_torture_fqs(void *arg) static int rcu_torture_writer(void *arg) { - bool exp; + unsigned long gp_snap; + bool gp_cond1 = gp_cond, gp_exp1 = gp_exp, gp_normal1 = gp_normal; + bool gp_sync1 = gp_sync; int i; struct rcu_torture *rp; - struct rcu_torture *rp1; struct rcu_torture *old_rp; static DEFINE_TORTURE_RANDOM(rand); + int synctype[] = { RTWS_DEF_FREE, RTWS_EXP_SYNC, + RTWS_COND_GET, RTWS_SYNC }; + int nsynctypes = 0; VERBOSE_TOROUT_STRING("rcu_torture_writer task started"); - set_user_nice(current, MAX_NICE); + + /* Initialize synctype[] array. If none set, take default. */ + if (!gp_cond1 && !gp_exp1 && !gp_normal1 && !gp_sync) + gp_cond1 = gp_exp1 = gp_normal1 = gp_sync1 = true; + if (gp_cond1 && cur_ops->get_state && cur_ops->cond_sync) + synctype[nsynctypes++] = RTWS_COND_GET; + else if (gp_cond && (!cur_ops->get_state || !cur_ops->cond_sync)) + pr_alert("rcu_torture_writer: gp_cond without primitives.\n"); + if (gp_exp1 && cur_ops->exp_sync) + synctype[nsynctypes++] = RTWS_EXP_SYNC; + else if (gp_exp && !cur_ops->exp_sync) + pr_alert("rcu_torture_writer: gp_exp without primitives.\n"); + if (gp_normal1 && cur_ops->deferred_free) + synctype[nsynctypes++] = RTWS_DEF_FREE; + else if (gp_normal && !cur_ops->deferred_free) + pr_alert("rcu_torture_writer: gp_normal without primitives.\n"); + if (gp_sync1 && cur_ops->sync) + synctype[nsynctypes++] = RTWS_SYNC; + else if (gp_sync && !cur_ops->sync) + pr_alert("rcu_torture_writer: gp_sync without primitives.\n"); + if (WARN_ONCE(nsynctypes == 0, + "rcu_torture_writer: No update-side primitives.\n")) { + /* + * No updates primitives, so don't try updating. + * The resulting test won't be testing much, hence the + * above WARN_ONCE(). + */ + rcu_torture_writer_state = RTWS_STOPPING; + torture_kthread_stopping("rcu_torture_writer"); + } do { + rcu_torture_writer_state = RTWS_FIXED_DELAY; schedule_timeout_uninterruptible(1); rp = rcu_torture_alloc(); if (rp == NULL) continue; rp->rtort_pipe_count = 0; + rcu_torture_writer_state = RTWS_DELAY; udelay(torture_random(&rand) & 0x3ff); + rcu_torture_writer_state = RTWS_REPLACE; old_rp = rcu_dereference_check(rcu_torture_current, current == writer_task); rp->rtort_mbtest = 1; @@ -716,35 +810,42 @@ rcu_torture_writer(void *arg) i = RCU_TORTURE_PIPE_LEN; atomic_inc(&rcu_torture_wcount[i]); old_rp->rtort_pipe_count++; - if (gp_normal == gp_exp) - exp = !!(torture_random(&rand) & 0x80); - else - exp = gp_exp; - if (!exp) { + switch (synctype[torture_random(&rand) % nsynctypes]) { + case RTWS_DEF_FREE: + rcu_torture_writer_state = RTWS_DEF_FREE; cur_ops->deferred_free(old_rp); - } else { + break; + case RTWS_EXP_SYNC: + rcu_torture_writer_state = RTWS_EXP_SYNC; cur_ops->exp_sync(); - list_add(&old_rp->rtort_free, - &rcu_torture_removed); - list_for_each_entry_safe(rp, rp1, - &rcu_torture_removed, - rtort_free) { - i = rp->rtort_pipe_count; - if (i > RCU_TORTURE_PIPE_LEN) - i = RCU_TORTURE_PIPE_LEN; - atomic_inc(&rcu_torture_wcount[i]); - if (++rp->rtort_pipe_count >= - RCU_TORTURE_PIPE_LEN) { - rp->rtort_mbtest = 0; - list_del(&rp->rtort_free); - rcu_torture_free(rp); - } - } + rcu_torture_pipe_update(old_rp); + break; + case RTWS_COND_GET: + rcu_torture_writer_state = RTWS_COND_GET; + gp_snap = cur_ops->get_state(); + i = torture_random(&rand) % 16; + if (i != 0) + schedule_timeout_interruptible(i); + udelay(torture_random(&rand) % 1000); + rcu_torture_writer_state = RTWS_COND_SYNC; + cur_ops->cond_sync(gp_snap); + rcu_torture_pipe_update(old_rp); + break; + case RTWS_SYNC: + rcu_torture_writer_state = RTWS_SYNC; + cur_ops->sync(); + rcu_torture_pipe_update(old_rp); + break; + default: + WARN_ON_ONCE(1); + break; } } rcutorture_record_progress(++rcu_torture_current_version); + rcu_torture_writer_state = RTWS_STUTTER; stutter_wait("rcu_torture_writer"); } while (!torture_must_stop()); + rcu_torture_writer_state = RTWS_STOPPING; torture_kthread_stopping("rcu_torture_writer"); return 0; } @@ -784,7 +885,7 @@ rcu_torture_fakewriter(void *arg) return 0; } -void rcutorture_trace_dump(void) +static void rcutorture_trace_dump(void) { static atomic_t beenhere = ATOMIC_INIT(0); @@ -918,11 +1019,13 @@ rcu_torture_reader(void *arg) __this_cpu_inc(rcu_torture_batch[completed]); preempt_enable(); cur_ops->readunlock(idx); - schedule(); + cond_resched(); stutter_wait("rcu_torture_reader"); } while (!torture_must_stop()); - if (irqreader && cur_ops->irq_capable) + if (irqreader && cur_ops->irq_capable) { del_timer_sync(&t); + destroy_timer_on_stack(&t); + } torture_kthread_stopping("rcu_torture_reader"); return 0; } @@ -937,6 +1040,7 @@ rcu_torture_printk(char *page) int i; long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; + static unsigned long rtcv_snap = ULONG_MAX; for_each_possible_cpu(cpu) { for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { @@ -997,6 +1101,22 @@ rcu_torture_printk(char *page) page += sprintf(page, "\n"); if (cur_ops->stats) cur_ops->stats(page); + if (rtcv_snap == rcu_torture_current_version && + rcu_torture_current != NULL) { + int __maybe_unused flags; + unsigned long __maybe_unused gpnum; + unsigned long __maybe_unused completed; + + rcutorture_get_gp_data(cur_ops->ttype, + &flags, &gpnum, &completed); + page += sprintf(page, + "??? Writer stall state %d g%lu c%lu f%#x\n", + rcu_torture_writer_state, + gpnum, completed, flags); + show_rcu_gp_kthreads(); + rcutorture_trace_dump(); + } + rtcv_snap = rcu_torture_current_version; } /* @@ -1146,7 +1266,7 @@ static int __init rcu_torture_stall_init(void) } /* Callback function for RCU barrier testing. */ -void rcu_torture_barrier_cbf(struct rcu_head *rcu) +static void rcu_torture_barrier_cbf(struct rcu_head *rcu) { atomic_inc(&barrier_cbs_invoked); } @@ -1416,7 +1536,8 @@ rcu_torture_init(void) &rcu_ops, &rcu_bh_ops, &rcu_busted_ops, &srcu_ops, &sched_ops, }; - torture_init_begin(torture_type, verbose, &rcutorture_runnable); + if (!torture_init_begin(torture_type, verbose, &rcutorture_runnable)) + return -EBUSY; /* Process args and tell the world that the torturer is on the job. */ for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { @@ -1441,10 +1562,13 @@ rcu_torture_init(void) if (cur_ops->init) cur_ops->init(); /* no "goto unwind" prior to this point!!! */ - if (nreaders >= 0) + if (nreaders >= 0) { nrealreaders = nreaders; - else - nrealreaders = 2 * num_online_cpus(); + } else { + nrealreaders = num_online_cpus() - 1; + if (nrealreaders <= 0) + nrealreaders = 1; + } rcu_torture_print_module_parms(cur_ops, "Start of test"); /* Set up the freelist. */ @@ -1533,7 +1657,8 @@ rcu_torture_init(void) fqs_duration = 0; if (fqs_duration) { /* Create the fqs thread */ - torture_create_kthread(rcu_torture_fqs, NULL, fqs_task); + firsterr = torture_create_kthread(rcu_torture_fqs, NULL, + fqs_task); if (firsterr) goto unwind; } diff --git a/kernel/rcu/tiny_plugin.h b/kernel/rcu/tiny_plugin.h index 431528520562..858c56569127 100644 --- a/kernel/rcu/tiny_plugin.h +++ b/kernel/rcu/tiny_plugin.h @@ -144,7 +144,7 @@ static void check_cpu_stall(struct rcu_ctrlblk *rcp) return; rcp->ticks_this_gp++; j = jiffies; - js = rcp->jiffies_stall; + js = ACCESS_ONCE(rcp->jiffies_stall); if (*rcp->curtail && ULONG_CMP_GE(j, js)) { pr_err("INFO: %s stall on CPU (%lu ticks this GP) idle=%llx (t=%lu jiffies q=%ld)\n", rcp->name, rcp->ticks_this_gp, rcu_dynticks_nesting, @@ -152,17 +152,17 @@ static void check_cpu_stall(struct rcu_ctrlblk *rcp) dump_stack(); } if (*rcp->curtail && ULONG_CMP_GE(j, js)) - rcp->jiffies_stall = jiffies + + ACCESS_ONCE(rcp->jiffies_stall) = jiffies + 3 * rcu_jiffies_till_stall_check() + 3; else if (ULONG_CMP_GE(j, js)) - rcp->jiffies_stall = jiffies + rcu_jiffies_till_stall_check(); + ACCESS_ONCE(rcp->jiffies_stall) = jiffies + rcu_jiffies_till_stall_check(); } static void reset_cpu_stall_ticks(struct rcu_ctrlblk *rcp) { rcp->ticks_this_gp = 0; rcp->gp_start = jiffies; - rcp->jiffies_stall = jiffies + rcu_jiffies_till_stall_check(); + ACCESS_ONCE(rcp->jiffies_stall) = jiffies + rcu_jiffies_till_stall_check(); } static void check_cpu_stalls(void) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 0c47e300210a..f1ba77363fbb 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -101,7 +101,7 @@ DEFINE_PER_CPU(struct rcu_data, sname##_data) RCU_STATE_INITIALIZER(rcu_sched, 's', call_rcu_sched); RCU_STATE_INITIALIZER(rcu_bh, 'b', call_rcu_bh); -static struct rcu_state *rcu_state; +static struct rcu_state *rcu_state_p; LIST_HEAD(rcu_struct_flavors); /* Increase (but not decrease) the CONFIG_RCU_FANOUT_LEAF at boot time. */ @@ -243,7 +243,7 @@ static ulong jiffies_till_next_fqs = ULONG_MAX; module_param(jiffies_till_first_fqs, ulong, 0644); module_param(jiffies_till_next_fqs, ulong, 0644); -static void rcu_start_gp_advanced(struct rcu_state *rsp, struct rcu_node *rnp, +static bool rcu_start_gp_advanced(struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_data *rdp); static void force_qs_rnp(struct rcu_state *rsp, int (*f)(struct rcu_data *rsp, bool *isidle, @@ -271,6 +271,15 @@ long rcu_batches_completed_bh(void) EXPORT_SYMBOL_GPL(rcu_batches_completed_bh); /* + * Force a quiescent state. + */ +void rcu_force_quiescent_state(void) +{ + force_quiescent_state(rcu_state_p); +} +EXPORT_SYMBOL_GPL(rcu_force_quiescent_state); + +/* * Force a quiescent state for RCU BH. */ void rcu_bh_force_quiescent_state(void) @@ -280,6 +289,21 @@ void rcu_bh_force_quiescent_state(void) EXPORT_SYMBOL_GPL(rcu_bh_force_quiescent_state); /* + * Show the state of the grace-period kthreads. + */ +void show_rcu_gp_kthreads(void) +{ + struct rcu_state *rsp; + + for_each_rcu_flavor(rsp) { + pr_info("%s: wait state: %d ->state: %#lx\n", + rsp->name, rsp->gp_state, rsp->gp_kthread->state); + /* sched_show_task(rsp->gp_kthread); */ + } +} +EXPORT_SYMBOL_GPL(show_rcu_gp_kthreads); + +/* * Record the number of times rcutorture tests have been initiated and * terminated. This information allows the debugfs tracing stats to be * correlated to the rcutorture messages, even when the rcutorture module @@ -294,6 +318,39 @@ void rcutorture_record_test_transition(void) EXPORT_SYMBOL_GPL(rcutorture_record_test_transition); /* + * Send along grace-period-related data for rcutorture diagnostics. + */ +void rcutorture_get_gp_data(enum rcutorture_type test_type, int *flags, + unsigned long *gpnum, unsigned long *completed) +{ + struct rcu_state *rsp = NULL; + + switch (test_type) { + case RCU_FLAVOR: + rsp = rcu_state_p; + break; + case RCU_BH_FLAVOR: + rsp = &rcu_bh_state; + break; + case RCU_SCHED_FLAVOR: + rsp = &rcu_sched_state; + break; + default: + break; + } + if (rsp != NULL) { + *flags = ACCESS_ONCE(rsp->gp_flags); + *gpnum = ACCESS_ONCE(rsp->gpnum); + *completed = ACCESS_ONCE(rsp->completed); + return; + } + *flags = 0; + *gpnum = 0; + *completed = 0; +} +EXPORT_SYMBOL_GPL(rcutorture_get_gp_data); + +/* * Record the number of writer passes through the current rcutorture test. * This is also used to correlate debugfs tracing stats with the rcutorture * messages. @@ -324,6 +381,28 @@ cpu_has_callbacks_ready_to_invoke(struct rcu_data *rdp) } /* + * Return the root node of the specified rcu_state structure. + */ +static struct rcu_node *rcu_get_root(struct rcu_state *rsp) +{ + return &rsp->node[0]; +} + +/* + * Is there any need for future grace periods? + * Interrupts must be disabled. If the caller does not hold the root + * rnp_node structure's ->lock, the results are advisory only. + */ +static int rcu_future_needs_gp(struct rcu_state *rsp) +{ + struct rcu_node *rnp = rcu_get_root(rsp); + int idx = (ACCESS_ONCE(rnp->completed) + 1) & 0x1; + int *fp = &rnp->need_future_gp[idx]; + + return ACCESS_ONCE(*fp); +} + +/* * Does the current CPU require a not-yet-started grace period? * The caller must have disabled interrupts to prevent races with * normal callback registry. @@ -335,7 +414,7 @@ cpu_needs_another_gp(struct rcu_state *rsp, struct rcu_data *rdp) if (rcu_gp_in_progress(rsp)) return 0; /* No, a grace period is already in progress. */ - if (rcu_nocb_needs_gp(rsp)) + if (rcu_future_needs_gp(rsp)) return 1; /* Yes, a no-CBs CPU needs one. */ if (!rdp->nxttail[RCU_NEXT_TAIL]) return 0; /* No, this is a no-CBs (or offline) CPU. */ @@ -350,14 +429,6 @@ cpu_needs_another_gp(struct rcu_state *rsp, struct rcu_data *rdp) } /* - * Return the root node of the specified rcu_state structure. - */ -static struct rcu_node *rcu_get_root(struct rcu_state *rsp) -{ - return &rsp->node[0]; -} - -/* * rcu_eqs_enter_common - current CPU is moving towards extended quiescent state * * If the new value of the ->dynticks_nesting counter now is zero, @@ -387,9 +458,9 @@ static void rcu_eqs_enter_common(struct rcu_dynticks *rdtp, long long oldval, } rcu_prepare_for_idle(smp_processor_id()); /* CPUs seeing atomic_inc() must see prior RCU read-side crit sects */ - smp_mb__before_atomic_inc(); /* See above. */ + smp_mb__before_atomic(); /* See above. */ atomic_inc(&rdtp->dynticks); - smp_mb__after_atomic_inc(); /* Force ordering with next sojourn. */ + smp_mb__after_atomic(); /* Force ordering with next sojourn. */ WARN_ON_ONCE(atomic_read(&rdtp->dynticks) & 0x1); /* @@ -507,10 +578,10 @@ void rcu_irq_exit(void) static void rcu_eqs_exit_common(struct rcu_dynticks *rdtp, long long oldval, int user) { - smp_mb__before_atomic_inc(); /* Force ordering w/previous sojourn. */ + smp_mb__before_atomic(); /* Force ordering w/previous sojourn. */ atomic_inc(&rdtp->dynticks); /* CPUs seeing atomic_inc() must see later RCU read-side crit sects */ - smp_mb__after_atomic_inc(); /* See above. */ + smp_mb__after_atomic(); /* See above. */ WARN_ON_ONCE(!(atomic_read(&rdtp->dynticks) & 0x1)); rcu_cleanup_after_idle(smp_processor_id()); trace_rcu_dyntick(TPS("End"), oldval, rdtp->dynticks_nesting); @@ -635,10 +706,10 @@ void rcu_nmi_enter(void) (atomic_read(&rdtp->dynticks) & 0x1)) return; rdtp->dynticks_nmi_nesting++; - smp_mb__before_atomic_inc(); /* Force delay from prior write. */ + smp_mb__before_atomic(); /* Force delay from prior write. */ atomic_inc(&rdtp->dynticks); /* CPUs seeing atomic_inc() must see later RCU read-side crit sects */ - smp_mb__after_atomic_inc(); /* See above. */ + smp_mb__after_atomic(); /* See above. */ WARN_ON_ONCE(!(atomic_read(&rdtp->dynticks) & 0x1)); } @@ -657,9 +728,9 @@ void rcu_nmi_exit(void) --rdtp->dynticks_nmi_nesting != 0) return; /* CPUs seeing atomic_inc() must see prior RCU read-side crit sects */ - smp_mb__before_atomic_inc(); /* See above. */ + smp_mb__before_atomic(); /* See above. */ atomic_inc(&rdtp->dynticks); - smp_mb__after_atomic_inc(); /* Force delay to next write. */ + smp_mb__after_atomic(); /* Force delay to next write. */ WARN_ON_ONCE(atomic_read(&rdtp->dynticks) & 0x1); } @@ -758,7 +829,12 @@ static int dyntick_save_progress_counter(struct rcu_data *rdp, { rdp->dynticks_snap = atomic_add_return(0, &rdp->dynticks->dynticks); rcu_sysidle_check_cpu(rdp, isidle, maxj); - return (rdp->dynticks_snap & 0x1) == 0; + if ((rdp->dynticks_snap & 0x1) == 0) { + trace_rcu_fqs(rdp->rsp->name, rdp->gpnum, rdp->cpu, TPS("dti")); + return 1; + } else { + return 0; + } } /* @@ -834,7 +910,7 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp, * we will beat on the first one until it gets unstuck, then move * to the next. Only do this for the primary flavor of RCU. */ - if (rdp->rsp == rcu_state && + if (rdp->rsp == rcu_state_p && ULONG_CMP_GE(jiffies, rdp->rsp->jiffies_resched)) { rdp->rsp->jiffies_resched += 5; resched_cpu(rdp->cpu); @@ -851,7 +927,7 @@ static void record_gp_stall_check_time(struct rcu_state *rsp) rsp->gp_start = j; smp_wmb(); /* Record start time before stall time. */ j1 = rcu_jiffies_till_stall_check(); - rsp->jiffies_stall = j + j1; + ACCESS_ONCE(rsp->jiffies_stall) = j + j1; rsp->jiffies_resched = j + j1 / 2; } @@ -890,12 +966,12 @@ static void print_other_cpu_stall(struct rcu_state *rsp) /* Only let one CPU complain about others per time interval. */ raw_spin_lock_irqsave(&rnp->lock, flags); - delta = jiffies - rsp->jiffies_stall; + delta = jiffies - ACCESS_ONCE(rsp->jiffies_stall); if (delta < RCU_STALL_RAT_DELAY || !rcu_gp_in_progress(rsp)) { raw_spin_unlock_irqrestore(&rnp->lock, flags); return; } - rsp->jiffies_stall = jiffies + 3 * rcu_jiffies_till_stall_check() + 3; + ACCESS_ONCE(rsp->jiffies_stall) = jiffies + 3 * rcu_jiffies_till_stall_check() + 3; raw_spin_unlock_irqrestore(&rnp->lock, flags); /* @@ -932,9 +1008,9 @@ static void print_other_cpu_stall(struct rcu_state *rsp) print_cpu_stall_info_end(); for_each_possible_cpu(cpu) totqlen += per_cpu_ptr(rsp->rda, cpu)->qlen; - pr_cont("(detected by %d, t=%ld jiffies, g=%lu, c=%lu, q=%lu)\n", + pr_cont("(detected by %d, t=%ld jiffies, g=%ld, c=%ld, q=%lu)\n", smp_processor_id(), (long)(jiffies - rsp->gp_start), - rsp->gpnum, rsp->completed, totqlen); + (long)rsp->gpnum, (long)rsp->completed, totqlen); if (ndetected == 0) pr_err("INFO: Stall ended before state dump start\n"); else if (!trigger_all_cpu_backtrace()) @@ -947,12 +1023,6 @@ static void print_other_cpu_stall(struct rcu_state *rsp) force_quiescent_state(rsp); /* Kick them all. */ } -/* - * This function really isn't for public consumption, but RCU is special in - * that context switches can allow the state machine to make progress. - */ -extern void resched_cpu(int cpu); - static void print_cpu_stall(struct rcu_state *rsp) { int cpu; @@ -971,14 +1041,15 @@ static void print_cpu_stall(struct rcu_state *rsp) print_cpu_stall_info_end(); for_each_possible_cpu(cpu) totqlen += per_cpu_ptr(rsp->rda, cpu)->qlen; - pr_cont(" (t=%lu jiffies g=%lu c=%lu q=%lu)\n", - jiffies - rsp->gp_start, rsp->gpnum, rsp->completed, totqlen); + pr_cont(" (t=%lu jiffies g=%ld c=%ld q=%lu)\n", + jiffies - rsp->gp_start, + (long)rsp->gpnum, (long)rsp->completed, totqlen); if (!trigger_all_cpu_backtrace()) dump_stack(); raw_spin_lock_irqsave(&rnp->lock, flags); - if (ULONG_CMP_GE(jiffies, rsp->jiffies_stall)) - rsp->jiffies_stall = jiffies + + if (ULONG_CMP_GE(jiffies, ACCESS_ONCE(rsp->jiffies_stall))) + ACCESS_ONCE(rsp->jiffies_stall) = jiffies + 3 * rcu_jiffies_till_stall_check() + 3; raw_spin_unlock_irqrestore(&rnp->lock, flags); @@ -1062,7 +1133,7 @@ void rcu_cpu_stall_reset(void) struct rcu_state *rsp; for_each_rcu_flavor(rsp) - rsp->jiffies_stall = jiffies + ULONG_MAX / 2; + ACCESS_ONCE(rsp->jiffies_stall) = jiffies + ULONG_MAX / 2; } /* @@ -1123,15 +1194,18 @@ static void trace_rcu_future_gp(struct rcu_node *rnp, struct rcu_data *rdp, /* * Start some future grace period, as needed to handle newly arrived * callbacks. The required future grace periods are recorded in each - * rcu_node structure's ->need_future_gp field. + * rcu_node structure's ->need_future_gp field. Returns true if there + * is reason to awaken the grace-period kthread. * * The caller must hold the specified rcu_node structure's ->lock. */ -static unsigned long __maybe_unused -rcu_start_future_gp(struct rcu_node *rnp, struct rcu_data *rdp) +static bool __maybe_unused +rcu_start_future_gp(struct rcu_node *rnp, struct rcu_data *rdp, + unsigned long *c_out) { unsigned long c; int i; + bool ret = false; struct rcu_node *rnp_root = rcu_get_root(rdp->rsp); /* @@ -1142,7 +1216,7 @@ rcu_start_future_gp(struct rcu_node *rnp, struct rcu_data *rdp) trace_rcu_future_gp(rnp, rdp, c, TPS("Startleaf")); if (rnp->need_future_gp[c & 0x1]) { trace_rcu_future_gp(rnp, rdp, c, TPS("Prestartleaf")); - return c; + goto out; } /* @@ -1156,7 +1230,7 @@ rcu_start_future_gp(struct rcu_node *rnp, struct rcu_data *rdp) ACCESS_ONCE(rnp->gpnum) != ACCESS_ONCE(rnp->completed)) { rnp->need_future_gp[c & 0x1]++; trace_rcu_future_gp(rnp, rdp, c, TPS("Startedleaf")); - return c; + goto out; } /* @@ -1197,12 +1271,15 @@ rcu_start_future_gp(struct rcu_node *rnp, struct rcu_data *rdp) trace_rcu_future_gp(rnp, rdp, c, TPS("Startedleafroot")); } else { trace_rcu_future_gp(rnp, rdp, c, TPS("Startedroot")); - rcu_start_gp_advanced(rdp->rsp, rnp_root, rdp); + ret = rcu_start_gp_advanced(rdp->rsp, rnp_root, rdp); } unlock_out: if (rnp != rnp_root) raw_spin_unlock(&rnp_root->lock); - return c; +out: + if (c_out != NULL) + *c_out = c; + return ret; } /* @@ -1226,25 +1303,43 @@ static int rcu_future_gp_cleanup(struct rcu_state *rsp, struct rcu_node *rnp) } /* + * Awaken the grace-period kthread for the specified flavor of RCU. + * Don't do a self-awaken, and don't bother awakening when there is + * nothing for the grace-period kthread to do (as in several CPUs + * raced to awaken, and we lost), and finally don't try to awaken + * a kthread that has not yet been created. + */ +static void rcu_gp_kthread_wake(struct rcu_state *rsp) +{ + if (current == rsp->gp_kthread || + !ACCESS_ONCE(rsp->gp_flags) || + !rsp->gp_kthread) + return; + wake_up(&rsp->gp_wq); +} + +/* * If there is room, assign a ->completed number to any callbacks on * this CPU that have not already been assigned. Also accelerate any * callbacks that were previously assigned a ->completed number that has * since proven to be too conservative, which can happen if callbacks get * assigned a ->completed number while RCU is idle, but with reference to * a non-root rcu_node structure. This function is idempotent, so it does - * not hurt to call it repeatedly. + * not hurt to call it repeatedly. Returns an flag saying that we should + * awaken the RCU grace-period kthread. * * The caller must hold rnp->lock with interrupts disabled. */ -static void rcu_accelerate_cbs(struct rcu_state *rsp, struct rcu_node *rnp, +static bool rcu_accelerate_cbs(struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_data *rdp) { unsigned long c; int i; + bool ret; /* If the CPU has no callbacks, nothing to do. */ if (!rdp->nxttail[RCU_NEXT_TAIL] || !*rdp->nxttail[RCU_DONE_TAIL]) - return; + return false; /* * Starting from the sublist containing the callbacks most @@ -1273,7 +1368,7 @@ static void rcu_accelerate_cbs(struct rcu_state *rsp, struct rcu_node *rnp, * be grouped into. */ if (++i >= RCU_NEXT_TAIL) - return; + return false; /* * Assign all subsequent callbacks' ->completed number to the next @@ -1285,13 +1380,14 @@ static void rcu_accelerate_cbs(struct rcu_state *rsp, struct rcu_node *rnp, rdp->nxtcompleted[i] = c; } /* Record any needed additional grace periods. */ - rcu_start_future_gp(rnp, rdp); + ret = rcu_start_future_gp(rnp, rdp, NULL); /* Trace depending on how much we were able to accelerate. */ if (!*rdp->nxttail[RCU_WAIT_TAIL]) trace_rcu_grace_period(rsp->name, rdp->gpnum, TPS("AccWaitCB")); else trace_rcu_grace_period(rsp->name, rdp->gpnum, TPS("AccReadyCB")); + return ret; } /* @@ -1300,17 +1396,18 @@ static void rcu_accelerate_cbs(struct rcu_state *rsp, struct rcu_node *rnp, * assign ->completed numbers to any callbacks in the RCU_NEXT_TAIL * sublist. This function is idempotent, so it does not hurt to * invoke it repeatedly. As long as it is not invoked -too- often... + * Returns true if the RCU grace-period kthread needs to be awakened. * * The caller must hold rnp->lock with interrupts disabled. */ -static void rcu_advance_cbs(struct rcu_state *rsp, struct rcu_node *rnp, +static bool rcu_advance_cbs(struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_data *rdp) { int i, j; /* If the CPU has no callbacks, nothing to do. */ if (!rdp->nxttail[RCU_NEXT_TAIL] || !*rdp->nxttail[RCU_DONE_TAIL]) - return; + return false; /* * Find all callbacks whose ->completed numbers indicate that they @@ -1334,26 +1431,30 @@ static void rcu_advance_cbs(struct rcu_state *rsp, struct rcu_node *rnp, } /* Classify any remaining callbacks. */ - rcu_accelerate_cbs(rsp, rnp, rdp); + return rcu_accelerate_cbs(rsp, rnp, rdp); } /* * Update CPU-local rcu_data state to record the beginnings and ends of * grace periods. The caller must hold the ->lock of the leaf rcu_node * structure corresponding to the current CPU, and must have irqs disabled. + * Returns true if the grace-period kthread needs to be awakened. */ -static void __note_gp_changes(struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_data *rdp) +static bool __note_gp_changes(struct rcu_state *rsp, struct rcu_node *rnp, + struct rcu_data *rdp) { + bool ret; + /* Handle the ends of any preceding grace periods first. */ if (rdp->completed == rnp->completed) { /* No grace period end, so just accelerate recent callbacks. */ - rcu_accelerate_cbs(rsp, rnp, rdp); + ret = rcu_accelerate_cbs(rsp, rnp, rdp); } else { /* Advance callbacks. */ - rcu_advance_cbs(rsp, rnp, rdp); + ret = rcu_advance_cbs(rsp, rnp, rdp); /* Remember that we saw this grace-period completion. */ rdp->completed = rnp->completed; @@ -1372,11 +1473,13 @@ static void __note_gp_changes(struct rcu_state *rsp, struct rcu_node *rnp, struc rdp->qs_pending = !!(rnp->qsmask & rdp->grpmask); zero_cpu_stall_ticks(rdp); } + return ret; } static void note_gp_changes(struct rcu_state *rsp, struct rcu_data *rdp) { unsigned long flags; + bool needwake; struct rcu_node *rnp; local_irq_save(flags); @@ -1388,8 +1491,10 @@ static void note_gp_changes(struct rcu_state *rsp, struct rcu_data *rdp) return; } smp_mb__after_unlock_lock(); - __note_gp_changes(rsp, rnp, rdp); + needwake = __note_gp_changes(rsp, rnp, rdp); raw_spin_unlock_irqrestore(&rnp->lock, flags); + if (needwake) + rcu_gp_kthread_wake(rsp); } /* @@ -1403,12 +1508,12 @@ static int rcu_gp_init(struct rcu_state *rsp) rcu_bind_gp_kthread(); raw_spin_lock_irq(&rnp->lock); smp_mb__after_unlock_lock(); - if (rsp->gp_flags == 0) { + if (!ACCESS_ONCE(rsp->gp_flags)) { /* Spurious wakeup, tell caller to go back to sleep. */ raw_spin_unlock_irq(&rnp->lock); return 0; } - rsp->gp_flags = 0; /* Clear all flags: New grace period. */ + ACCESS_ONCE(rsp->gp_flags) = 0; /* Clear all flags: New grace period. */ if (WARN_ON_ONCE(rcu_gp_in_progress(rsp))) { /* @@ -1453,7 +1558,7 @@ static int rcu_gp_init(struct rcu_state *rsp) WARN_ON_ONCE(rnp->completed != rsp->completed); ACCESS_ONCE(rnp->completed) = rsp->completed; if (rnp == rdp->mynode) - __note_gp_changes(rsp, rnp, rdp); + (void)__note_gp_changes(rsp, rnp, rdp); rcu_preempt_boost_start_gp(rnp); trace_rcu_grace_period_init(rsp->name, rnp->gpnum, rnp->level, rnp->grplo, @@ -1501,7 +1606,7 @@ static int rcu_gp_fqs(struct rcu_state *rsp, int fqs_state_in) if (ACCESS_ONCE(rsp->gp_flags) & RCU_GP_FLAG_FQS) { raw_spin_lock_irq(&rnp->lock); smp_mb__after_unlock_lock(); - rsp->gp_flags &= ~RCU_GP_FLAG_FQS; + ACCESS_ONCE(rsp->gp_flags) &= ~RCU_GP_FLAG_FQS; raw_spin_unlock_irq(&rnp->lock); } return fqs_state; @@ -1513,6 +1618,7 @@ static int rcu_gp_fqs(struct rcu_state *rsp, int fqs_state_in) static void rcu_gp_cleanup(struct rcu_state *rsp) { unsigned long gp_duration; + bool needgp = false; int nocb = 0; struct rcu_data *rdp; struct rcu_node *rnp = rcu_get_root(rsp); @@ -1548,7 +1654,7 @@ static void rcu_gp_cleanup(struct rcu_state *rsp) ACCESS_ONCE(rnp->completed) = rsp->gpnum; rdp = this_cpu_ptr(rsp->rda); if (rnp == rdp->mynode) - __note_gp_changes(rsp, rnp, rdp); + needgp = __note_gp_changes(rsp, rnp, rdp) || needgp; /* smp_mb() provided by prior unlock-lock pair. */ nocb += rcu_future_gp_cleanup(rsp, rnp); raw_spin_unlock_irq(&rnp->lock); @@ -1564,9 +1670,10 @@ static void rcu_gp_cleanup(struct rcu_state *rsp) trace_rcu_grace_period(rsp->name, rsp->completed, TPS("end")); rsp->fqs_state = RCU_GP_IDLE; rdp = this_cpu_ptr(rsp->rda); - rcu_advance_cbs(rsp, rnp, rdp); /* Reduce false positives below. */ - if (cpu_needs_another_gp(rsp, rdp)) { - rsp->gp_flags = RCU_GP_FLAG_INIT; + /* Advance CBs to reduce false positives below. */ + needgp = rcu_advance_cbs(rsp, rnp, rdp) || needgp; + if (needgp || cpu_needs_another_gp(rsp, rdp)) { + ACCESS_ONCE(rsp->gp_flags) = RCU_GP_FLAG_INIT; trace_rcu_grace_period(rsp->name, ACCESS_ONCE(rsp->gpnum), TPS("newreq")); @@ -1593,6 +1700,7 @@ static int __noreturn rcu_gp_kthread(void *arg) trace_rcu_grace_period(rsp->name, ACCESS_ONCE(rsp->gpnum), TPS("reqwait")); + rsp->gp_state = RCU_GP_WAIT_GPS; wait_event_interruptible(rsp->gp_wq, ACCESS_ONCE(rsp->gp_flags) & RCU_GP_FLAG_INIT); @@ -1620,6 +1728,7 @@ static int __noreturn rcu_gp_kthread(void *arg) trace_rcu_grace_period(rsp->name, ACCESS_ONCE(rsp->gpnum), TPS("fqswait")); + rsp->gp_state = RCU_GP_WAIT_FQS; ret = wait_event_interruptible_timeout(rsp->gp_wq, ((gf = ACCESS_ONCE(rsp->gp_flags)) & RCU_GP_FLAG_FQS) || @@ -1665,14 +1774,6 @@ static int __noreturn rcu_gp_kthread(void *arg) } } -static void rsp_wakeup(struct irq_work *work) -{ - struct rcu_state *rsp = container_of(work, struct rcu_state, wakeup_work); - - /* Wake up rcu_gp_kthread() to start the grace period. */ - wake_up(&rsp->gp_wq); -} - /* * Start a new RCU grace period if warranted, re-initializing the hierarchy * in preparation for detecting the next grace period. The caller must hold @@ -1681,8 +1782,10 @@ static void rsp_wakeup(struct irq_work *work) * Note that it is legal for a dying CPU (which is marked as offline) to * invoke this function. This can happen when the dying CPU reports its * quiescent state. + * + * Returns true if the grace-period kthread must be awakened. */ -static void +static bool rcu_start_gp_advanced(struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_data *rdp) { @@ -1693,20 +1796,18 @@ rcu_start_gp_advanced(struct rcu_state *rsp, struct rcu_node *rnp, * or a grace period is already in progress. * Either way, don't start a new grace period. */ - return; + return false; } - rsp->gp_flags = RCU_GP_FLAG_INIT; + ACCESS_ONCE(rsp->gp_flags) = RCU_GP_FLAG_INIT; trace_rcu_grace_period(rsp->name, ACCESS_ONCE(rsp->gpnum), TPS("newreq")); /* * We can't do wakeups while holding the rnp->lock, as that * could cause possible deadlocks with the rq->lock. Defer - * the wakeup to interrupt context. And don't bother waking - * up the running kthread. + * the wakeup to our caller. */ - if (current != rsp->gp_kthread) - irq_work_queue(&rsp->wakeup_work); + return true; } /* @@ -1715,12 +1816,14 @@ rcu_start_gp_advanced(struct rcu_state *rsp, struct rcu_node *rnp, * is invoked indirectly from rcu_advance_cbs(), which would result in * endless recursion -- or would do so if it wasn't for the self-deadlock * that is encountered beforehand. + * + * Returns true if the grace-period kthread needs to be awakened. */ -static void -rcu_start_gp(struct rcu_state *rsp) +static bool rcu_start_gp(struct rcu_state *rsp) { struct rcu_data *rdp = this_cpu_ptr(rsp->rda); struct rcu_node *rnp = rcu_get_root(rsp); + bool ret = false; /* * If there is no grace period in progress right now, any @@ -1730,8 +1833,9 @@ rcu_start_gp(struct rcu_state *rsp) * resulting in pointless grace periods. So, advance callbacks * then start the grace period! */ - rcu_advance_cbs(rsp, rnp, rdp); - rcu_start_gp_advanced(rsp, rnp, rdp); + ret = rcu_advance_cbs(rsp, rnp, rdp) || ret; + ret = rcu_start_gp_advanced(rsp, rnp, rdp) || ret; + return ret; } /* @@ -1820,6 +1924,7 @@ rcu_report_qs_rdp(int cpu, struct rcu_state *rsp, struct rcu_data *rdp) { unsigned long flags; unsigned long mask; + bool needwake; struct rcu_node *rnp; rnp = rdp->mynode; @@ -1848,9 +1953,11 @@ rcu_report_qs_rdp(int cpu, struct rcu_state *rsp, struct rcu_data *rdp) * This GP can't end until cpu checks in, so all of our * callbacks can be processed during the next GP. */ - rcu_accelerate_cbs(rsp, rnp, rdp); + needwake = rcu_accelerate_cbs(rsp, rnp, rdp); rcu_report_qs_rnp(mask, rsp, rnp, flags); /* rlses rnp->lock */ + if (needwake) + rcu_gp_kthread_wake(rsp); } } @@ -1951,7 +2058,7 @@ rcu_send_cbs_to_orphanage(int cpu, struct rcu_state *rsp, static void rcu_adopt_orphan_cbs(struct rcu_state *rsp, unsigned long flags) { int i; - struct rcu_data *rdp = __this_cpu_ptr(rsp->rda); + struct rcu_data *rdp = raw_cpu_ptr(rsp->rda); /* No-CBs CPUs are handled specially. */ if (rcu_nocb_adopt_orphan_cbs(rsp, rdp, flags)) @@ -2320,7 +2427,7 @@ static void force_quiescent_state(struct rcu_state *rsp) raw_spin_unlock_irqrestore(&rnp_old->lock, flags); return; /* Someone beat us to it. */ } - rsp->gp_flags |= RCU_GP_FLAG_FQS; + ACCESS_ONCE(rsp->gp_flags) |= RCU_GP_FLAG_FQS; raw_spin_unlock_irqrestore(&rnp_old->lock, flags); wake_up(&rsp->gp_wq); /* Memory barrier implied by wake_up() path. */ } @@ -2334,7 +2441,8 @@ static void __rcu_process_callbacks(struct rcu_state *rsp) { unsigned long flags; - struct rcu_data *rdp = __this_cpu_ptr(rsp->rda); + bool needwake; + struct rcu_data *rdp = raw_cpu_ptr(rsp->rda); WARN_ON_ONCE(rdp->beenonline == 0); @@ -2345,8 +2453,10 @@ __rcu_process_callbacks(struct rcu_state *rsp) local_irq_save(flags); if (cpu_needs_another_gp(rsp, rdp)) { raw_spin_lock(&rcu_get_root(rsp)->lock); /* irqs disabled. */ - rcu_start_gp(rsp); + needwake = rcu_start_gp(rsp); raw_spin_unlock_irqrestore(&rcu_get_root(rsp)->lock, flags); + if (needwake) + rcu_gp_kthread_wake(rsp); } else { local_irq_restore(flags); } @@ -2404,6 +2514,8 @@ static void invoke_rcu_core(void) static void __call_rcu_core(struct rcu_state *rsp, struct rcu_data *rdp, struct rcu_head *head, unsigned long flags) { + bool needwake; + /* * If called from an extended quiescent state, invoke the RCU * core in order to force a re-evaluation of RCU's idleness. @@ -2433,8 +2545,10 @@ static void __call_rcu_core(struct rcu_state *rsp, struct rcu_data *rdp, raw_spin_lock(&rnp_root->lock); smp_mb__after_unlock_lock(); - rcu_start_gp(rsp); + needwake = rcu_start_gp(rsp); raw_spin_unlock(&rnp_root->lock); + if (needwake) + rcu_gp_kthread_wake(rsp); } else { /* Give the grace period a kick. */ rdp->blimit = LONG_MAX; @@ -2537,6 +2651,20 @@ void call_rcu_bh(struct rcu_head *head, void (*func)(struct rcu_head *rcu)) EXPORT_SYMBOL_GPL(call_rcu_bh); /* + * Queue an RCU callback for lazy invocation after a grace period. + * This will likely be later named something like "call_rcu_lazy()", + * but this change will require some way of tagging the lazy RCU + * callbacks in the list of pending callbacks. Until then, this + * function may only be called from __kfree_rcu(). + */ +void kfree_call_rcu(struct rcu_head *head, + void (*func)(struct rcu_head *rcu)) +{ + __call_rcu(head, func, rcu_state_p, -1, 1); +} +EXPORT_SYMBOL_GPL(kfree_call_rcu); + +/* * Because a context switch is a grace period for RCU-sched and RCU-bh, * any blocking grace-period wait automatically implies a grace period * if there is only one CPU online at any point time during execution @@ -2659,7 +2787,7 @@ unsigned long get_state_synchronize_rcu(void) * time-consuming work between get_state_synchronize_rcu() * and cond_synchronize_rcu(). */ - return smp_load_acquire(&rcu_state->gpnum); + return smp_load_acquire(&rcu_state_p->gpnum); } EXPORT_SYMBOL_GPL(get_state_synchronize_rcu); @@ -2685,7 +2813,7 @@ void cond_synchronize_rcu(unsigned long oldstate) * Ensure that this load happens before any RCU-destructive * actions the caller might carry out after we return. */ - newstate = smp_load_acquire(&rcu_state->completed); + newstate = smp_load_acquire(&rcu_state_p->completed); if (ULONG_CMP_GE(oldstate, newstate)) synchronize_rcu(); } @@ -2790,7 +2918,7 @@ void synchronize_sched_expedited(void) s = atomic_long_read(&rsp->expedited_done); if (ULONG_CMP_GE((ulong)s, (ulong)firstsnap)) { /* ensure test happens before caller kfree */ - smp_mb__before_atomic_inc(); /* ^^^ */ + smp_mb__before_atomic(); /* ^^^ */ atomic_long_inc(&rsp->expedited_workdone1); return; } @@ -2808,7 +2936,7 @@ void synchronize_sched_expedited(void) s = atomic_long_read(&rsp->expedited_done); if (ULONG_CMP_GE((ulong)s, (ulong)firstsnap)) { /* ensure test happens before caller kfree */ - smp_mb__before_atomic_inc(); /* ^^^ */ + smp_mb__before_atomic(); /* ^^^ */ atomic_long_inc(&rsp->expedited_workdone2); return; } @@ -2837,7 +2965,7 @@ void synchronize_sched_expedited(void) s = atomic_long_read(&rsp->expedited_done); if (ULONG_CMP_GE((ulong)s, (ulong)snap)) { /* ensure test happens before caller kfree */ - smp_mb__before_atomic_inc(); /* ^^^ */ + smp_mb__before_atomic(); /* ^^^ */ atomic_long_inc(&rsp->expedited_done_lost); break; } @@ -2988,7 +3116,7 @@ static void rcu_barrier_callback(struct rcu_head *rhp) static void rcu_barrier_func(void *type) { struct rcu_state *rsp = type; - struct rcu_data *rdp = __this_cpu_ptr(rsp->rda); + struct rcu_data *rdp = raw_cpu_ptr(rsp->rda); _rcu_barrier_trace(rsp, "IRQ", -1, rsp->n_barrier_done); atomic_inc(&rsp->barrier_cpu_count); @@ -3160,7 +3288,7 @@ rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp) * that this CPU cannot possibly have any RCU callbacks in flight yet. */ static void -rcu_init_percpu_data(int cpu, struct rcu_state *rsp, int preemptible) +rcu_init_percpu_data(int cpu, struct rcu_state *rsp) { unsigned long flags; unsigned long mask; @@ -3173,7 +3301,6 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp, int preemptible) /* Set up local state, ensuring consistent view of global state. */ raw_spin_lock_irqsave(&rnp->lock, flags); rdp->beenonline = 1; /* We have now been online. */ - rdp->preemptible = preemptible; rdp->qlen_last_fqs_check = 0; rdp->n_force_qs_snap = rsp->n_force_qs; rdp->blimit = blimit; @@ -3217,8 +3344,7 @@ static void rcu_prepare_cpu(int cpu) struct rcu_state *rsp; for_each_rcu_flavor(rsp) - rcu_init_percpu_data(cpu, rsp, - strcmp(rsp->name, "rcu_preempt") == 0); + rcu_init_percpu_data(cpu, rsp); } /* @@ -3228,7 +3354,7 @@ static int rcu_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu) { long cpu = (long)hcpu; - struct rcu_data *rdp = per_cpu_ptr(rcu_state->rda, cpu); + struct rcu_data *rdp = per_cpu_ptr(rcu_state_p->rda, cpu); struct rcu_node *rnp = rdp->mynode; struct rcu_state *rsp; @@ -3402,8 +3528,8 @@ static void __init rcu_init_one(struct rcu_state *rsp, rnp->qsmaskinit = 0; rnp->grplo = j * cpustride; rnp->grphi = (j + 1) * cpustride - 1; - if (rnp->grphi >= NR_CPUS) - rnp->grphi = NR_CPUS - 1; + if (rnp->grphi >= nr_cpu_ids) + rnp->grphi = nr_cpu_ids - 1; if (i == 0) { rnp->grpnum = 0; rnp->grpmask = 0; @@ -3422,7 +3548,6 @@ static void __init rcu_init_one(struct rcu_state *rsp, rsp->rda = rda; init_waitqueue_head(&rsp->gp_wq); - init_irq_work(&rsp->wakeup_work, rsp_wakeup); rnp = rsp->level[rcu_num_lvls - 1]; for_each_possible_cpu(i) { while (i > rnp->grphi) diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index 75dc3c39a02a..bf2c1e669691 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -252,7 +252,6 @@ struct rcu_data { bool passed_quiesce; /* User-mode/idle loop etc. */ bool qs_pending; /* Core waits for quiesc state. */ bool beenonline; /* CPU online at least once. */ - bool preemptible; /* Preemptible RCU? */ struct rcu_node *mynode; /* This CPU's leaf of hierarchy */ unsigned long grpmask; /* Mask to apply to leaf qsmask. */ #ifdef CONFIG_RCU_CPU_STALL_INFO @@ -406,7 +405,8 @@ struct rcu_state { unsigned long completed; /* # of last completed gp. */ struct task_struct *gp_kthread; /* Task for grace periods. */ wait_queue_head_t gp_wq; /* Where GP task waits. */ - int gp_flags; /* Commands for GP task. */ + short gp_flags; /* Commands for GP task. */ + short gp_state; /* GP kthread sleep state. */ /* End of fields guarded by root rcu_node's lock. */ @@ -462,13 +462,17 @@ struct rcu_state { const char *name; /* Name of structure. */ char abbr; /* Abbreviated name. */ struct list_head flavors; /* List of RCU flavors. */ - struct irq_work wakeup_work; /* Postponed wakeups */ }; /* Values for rcu_state structure's gp_flags field. */ #define RCU_GP_FLAG_INIT 0x1 /* Need grace-period initialization. */ #define RCU_GP_FLAG_FQS 0x2 /* Need grace-period quiescent-state forcing. */ +/* Values for rcu_state structure's gp_flags field. */ +#define RCU_GP_WAIT_INIT 0 /* Initial state. */ +#define RCU_GP_WAIT_GPS 1 /* Wait for grace-period start. */ +#define RCU_GP_WAIT_FQS 2 /* Wait for force-quiescent-state time. */ + extern struct list_head rcu_struct_flavors; /* Sequence through rcu_state structures for each RCU flavor. */ @@ -547,7 +551,6 @@ static void print_cpu_stall_info(struct rcu_state *rsp, int cpu); static void print_cpu_stall_info_end(void); static void zero_cpu_stall_ticks(struct rcu_data *rdp); static void increment_cpu_stall_ticks(void); -static int rcu_nocb_needs_gp(struct rcu_state *rsp); static void rcu_nocb_gp_set(struct rcu_node *rnp, int nrq); static void rcu_nocb_gp_cleanup(struct rcu_state *rsp, struct rcu_node *rnp); static void rcu_init_one_nocb(struct rcu_node *rnp); diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 962d1d589929..cbc2c45265e2 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -116,7 +116,7 @@ static void __init rcu_bootup_announce_oddness(void) #ifdef CONFIG_TREE_PREEMPT_RCU RCU_STATE_INITIALIZER(rcu_preempt, 'p', call_rcu); -static struct rcu_state *rcu_state = &rcu_preempt_state; +static struct rcu_state *rcu_state_p = &rcu_preempt_state; static int rcu_preempted_readers_exp(struct rcu_node *rnp); @@ -149,15 +149,6 @@ long rcu_batches_completed(void) EXPORT_SYMBOL_GPL(rcu_batches_completed); /* - * Force a quiescent state for preemptible RCU. - */ -void rcu_force_quiescent_state(void) -{ - force_quiescent_state(&rcu_preempt_state); -} -EXPORT_SYMBOL_GPL(rcu_force_quiescent_state); - -/* * Record a preemptible-RCU quiescent state for the specified CPU. Note * that this just means that the task currently running on the CPU is * not in a quiescent state. There might be any number of tasks blocked @@ -688,20 +679,6 @@ void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu)) } EXPORT_SYMBOL_GPL(call_rcu); -/* - * Queue an RCU callback for lazy invocation after a grace period. - * This will likely be later named something like "call_rcu_lazy()", - * but this change will require some way of tagging the lazy RCU - * callbacks in the list of pending callbacks. Until then, this - * function may only be called from __kfree_rcu(). - */ -void kfree_call_rcu(struct rcu_head *head, - void (*func)(struct rcu_head *rcu)) -{ - __call_rcu(head, func, &rcu_preempt_state, -1, 1); -} -EXPORT_SYMBOL_GPL(kfree_call_rcu); - /** * synchronize_rcu - wait until a grace period has elapsed. * @@ -970,7 +947,7 @@ void exit_rcu(void) #else /* #ifdef CONFIG_TREE_PREEMPT_RCU */ -static struct rcu_state *rcu_state = &rcu_sched_state; +static struct rcu_state *rcu_state_p = &rcu_sched_state; /* * Tell them what RCU they are running. @@ -991,16 +968,6 @@ long rcu_batches_completed(void) EXPORT_SYMBOL_GPL(rcu_batches_completed); /* - * Force a quiescent state for RCU, which, because there is no preemptible - * RCU, becomes the same as rcu-sched. - */ -void rcu_force_quiescent_state(void) -{ - rcu_sched_force_quiescent_state(); -} -EXPORT_SYMBOL_GPL(rcu_force_quiescent_state); - -/* * Because preemptible RCU does not exist, we never have to check for * CPUs being in quiescent states. */ @@ -1080,22 +1047,6 @@ static void rcu_preempt_check_callbacks(int cpu) } /* - * Queue an RCU callback for lazy invocation after a grace period. - * This will likely be later named something like "call_rcu_lazy()", - * but this change will require some way of tagging the lazy RCU - * callbacks in the list of pending callbacks. Until then, this - * function may only be called from __kfree_rcu(). - * - * Because there is no preemptible RCU, we use RCU-sched instead. - */ -void kfree_call_rcu(struct rcu_head *head, - void (*func)(struct rcu_head *rcu)) -{ - __call_rcu(head, func, &rcu_sched_state, -1, 1); -} -EXPORT_SYMBOL_GPL(kfree_call_rcu); - -/* * Wait for an rcu-preempt grace period, but make it happen quickly. * But because preemptible RCU does not exist, map to rcu-sched. */ @@ -1517,11 +1468,11 @@ static int __init rcu_spawn_kthreads(void) for_each_possible_cpu(cpu) per_cpu(rcu_cpu_has_work, cpu) = 0; BUG_ON(smpboot_register_percpu_thread(&rcu_cpu_thread_spec)); - rnp = rcu_get_root(rcu_state); - (void)rcu_spawn_one_boost_kthread(rcu_state, rnp); + rnp = rcu_get_root(rcu_state_p); + (void)rcu_spawn_one_boost_kthread(rcu_state_p, rnp); if (NUM_RCU_NODES > 1) { - rcu_for_each_leaf_node(rcu_state, rnp) - (void)rcu_spawn_one_boost_kthread(rcu_state, rnp); + rcu_for_each_leaf_node(rcu_state_p, rnp) + (void)rcu_spawn_one_boost_kthread(rcu_state_p, rnp); } return 0; } @@ -1529,12 +1480,12 @@ early_initcall(rcu_spawn_kthreads); static void rcu_prepare_kthreads(int cpu) { - struct rcu_data *rdp = per_cpu_ptr(rcu_state->rda, cpu); + struct rcu_data *rdp = per_cpu_ptr(rcu_state_p->rda, cpu); struct rcu_node *rnp = rdp->mynode; /* Fire up the incoming CPU's kthread and leaf rcu_node kthread. */ if (rcu_scheduler_fully_active) - (void)rcu_spawn_one_boost_kthread(rcu_state, rnp); + (void)rcu_spawn_one_boost_kthread(rcu_state_p, rnp); } #else /* #ifdef CONFIG_RCU_BOOST */ @@ -1744,6 +1695,7 @@ int rcu_needs_cpu(int cpu, unsigned long *dj) static void rcu_prepare_for_idle(int cpu) { #ifndef CONFIG_RCU_NOCB_CPU_ALL + bool needwake; struct rcu_data *rdp; struct rcu_dynticks *rdtp = &per_cpu(rcu_dynticks, cpu); struct rcu_node *rnp; @@ -1792,8 +1744,10 @@ static void rcu_prepare_for_idle(int cpu) rnp = rdp->mynode; raw_spin_lock(&rnp->lock); /* irqs already disabled. */ smp_mb__after_unlock_lock(); - rcu_accelerate_cbs(rsp, rnp, rdp); + needwake = rcu_accelerate_cbs(rsp, rnp, rdp); raw_spin_unlock(&rnp->lock); /* irqs remain disabled. */ + if (needwake) + rcu_gp_kthread_wake(rsp); } #endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */ } @@ -1855,7 +1809,7 @@ static void rcu_oom_notify_cpu(void *unused) struct rcu_data *rdp; for_each_rcu_flavor(rsp) { - rdp = __this_cpu_ptr(rsp->rda); + rdp = raw_cpu_ptr(rsp->rda); if (rdp->qlen_lazy != 0) { atomic_inc(&oom_callback_count); rsp->call(&rdp->oom_head, rcu_oom_callback); @@ -1997,7 +1951,7 @@ static void increment_cpu_stall_ticks(void) struct rcu_state *rsp; for_each_rcu_flavor(rsp) - __this_cpu_ptr(rsp->rda)->ticks_this_gp++; + raw_cpu_inc(rsp->rda->ticks_this_gp); } #else /* #ifdef CONFIG_RCU_CPU_STALL_INFO */ @@ -2068,19 +2022,6 @@ static int __init parse_rcu_nocb_poll(char *arg) early_param("rcu_nocb_poll", parse_rcu_nocb_poll); /* - * Do any no-CBs CPUs need another grace period? - * - * Interrupts must be disabled. If the caller does not hold the root - * rnp_node structure's ->lock, the results are advisory only. - */ -static int rcu_nocb_needs_gp(struct rcu_state *rsp) -{ - struct rcu_node *rnp = rcu_get_root(rsp); - - return rnp->need_future_gp[(ACCESS_ONCE(rnp->completed) + 1) & 0x1]; -} - -/* * Wake up any no-CBs CPUs' kthreads that were waiting on the just-ended * grace period. */ @@ -2109,7 +2050,7 @@ static void rcu_init_one_nocb(struct rcu_node *rnp) } #ifndef CONFIG_RCU_NOCB_CPU_ALL -/* Is the specified CPU a no-CPUs CPU? */ +/* Is the specified CPU a no-CBs CPU? */ bool rcu_is_nocb_cpu(int cpu) { if (have_rcu_nocb_mask) @@ -2243,12 +2184,15 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp) unsigned long c; bool d; unsigned long flags; + bool needwake; struct rcu_node *rnp = rdp->mynode; raw_spin_lock_irqsave(&rnp->lock, flags); smp_mb__after_unlock_lock(); - c = rcu_start_future_gp(rnp, rdp); + needwake = rcu_start_future_gp(rnp, rdp, &c); raw_spin_unlock_irqrestore(&rnp->lock, flags); + if (needwake) + rcu_gp_kthread_wake(rdp->rsp); /* * Wait for the grace period. Do so interruptibly to avoid messing @@ -2402,11 +2346,6 @@ static bool init_nocb_callback_list(struct rcu_data *rdp) #else /* #ifdef CONFIG_RCU_NOCB_CPU */ -static int rcu_nocb_needs_gp(struct rcu_state *rsp) -{ - return 0; -} - static void rcu_nocb_gp_cleanup(struct rcu_state *rsp, struct rcu_node *rnp) { } @@ -2523,9 +2462,9 @@ static void rcu_sysidle_enter(struct rcu_dynticks *rdtp, int irq) /* Record start of fully idle period. */ j = jiffies; ACCESS_ONCE(rdtp->dynticks_idle_jiffies) = j; - smp_mb__before_atomic_inc(); + smp_mb__before_atomic(); atomic_inc(&rdtp->dynticks_idle); - smp_mb__after_atomic_inc(); + smp_mb__after_atomic(); WARN_ON_ONCE(atomic_read(&rdtp->dynticks_idle) & 0x1); } @@ -2590,9 +2529,9 @@ static void rcu_sysidle_exit(struct rcu_dynticks *rdtp, int irq) } /* Record end of idle period. */ - smp_mb__before_atomic_inc(); + smp_mb__before_atomic(); atomic_inc(&rdtp->dynticks_idle); - smp_mb__after_atomic_inc(); + smp_mb__after_atomic(); WARN_ON_ONCE(!(atomic_read(&rdtp->dynticks_idle) & 0x1)); /* @@ -2657,20 +2596,6 @@ static bool is_sysidle_rcu_state(struct rcu_state *rsp) } /* - * Bind the grace-period kthread for the sysidle flavor of RCU to the - * timekeeping CPU. - */ -static void rcu_bind_gp_kthread(void) -{ - int cpu = ACCESS_ONCE(tick_do_timer_cpu); - - if (cpu < 0 || cpu >= nr_cpu_ids) - return; - if (raw_smp_processor_id() != cpu) - set_cpus_allowed_ptr(current, cpumask_of(cpu)); -} - -/* * Return a delay in jiffies based on the number of CPUs, rcu_node * leaf fanout, and jiffies tick rate. The idea is to allow larger * systems more time to transition to full-idle state in order to @@ -2734,7 +2659,8 @@ static void rcu_sysidle(unsigned long j) static void rcu_sysidle_cancel(void) { smp_mb(); - ACCESS_ONCE(full_sysidle_state) = RCU_SYSIDLE_NOT; + if (full_sysidle_state > RCU_SYSIDLE_SHORT) + ACCESS_ONCE(full_sysidle_state) = RCU_SYSIDLE_NOT; } /* @@ -2880,10 +2806,6 @@ static bool is_sysidle_rcu_state(struct rcu_state *rsp) return false; } -static void rcu_bind_gp_kthread(void) -{ -} - static void rcu_sysidle_report_gp(struct rcu_state *rsp, int isidle, unsigned long maxj) { @@ -2914,3 +2836,19 @@ static bool rcu_nohz_full_cpu(struct rcu_state *rsp) #endif /* #ifdef CONFIG_NO_HZ_FULL */ return 0; } + +/* + * Bind the grace-period kthread for the sysidle flavor of RCU to the + * timekeeping CPU. + */ +static void rcu_bind_gp_kthread(void) +{ +#ifdef CONFIG_NO_HZ_FULL + int cpu = ACCESS_ONCE(tick_do_timer_cpu); + + if (cpu < 0 || cpu >= nr_cpu_ids) + return; + if (raw_smp_processor_id() != cpu) + set_cpus_allowed_ptr(current, cpumask_of(cpu)); +#endif /* #ifdef CONFIG_NO_HZ_FULL */ +} diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index 4c0a9b0af469..a2aeb4df0f60 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -320,6 +320,18 @@ int rcu_jiffies_till_stall_check(void) return till_stall_check * HZ + RCU_STALL_DELAY_DELTA; } +void rcu_sysrq_start(void) +{ + if (!rcu_cpu_stall_suppress) + rcu_cpu_stall_suppress = 2; +} + +void rcu_sysrq_end(void) +{ + if (rcu_cpu_stall_suppress == 2) + rcu_cpu_stall_suppress = 0; +} + static int rcu_panic(struct notifier_block *this, unsigned long ev, void *ptr) { rcu_cpu_stall_suppress = 1; @@ -338,3 +350,21 @@ static int __init check_cpu_stall_init(void) early_initcall(check_cpu_stall_init); #endif /* #ifdef CONFIG_RCU_STALL_COMMON */ + +/* + * Hooks for cond_resched() and friends to avoid RCU CPU stall warnings. + */ + +DEFINE_PER_CPU(int, rcu_cond_resched_count); + +/* + * Report a set of RCU quiescent states, for use by cond_resched() + * and friends. Out of line due to being called infrequently. + */ +void rcu_resched(void) +{ + preempt_disable(); + __this_cpu_write(rcu_cond_resched_count, 0); + rcu_note_context_switch(smp_processor_id()); + preempt_enable(); +} diff --git a/kernel/reboot.c b/kernel/reboot.c index 662c83fc16b7..a3a9e240fcdb 100644 --- a/kernel/reboot.c +++ b/kernel/reboot.c @@ -388,15 +388,22 @@ static int __init reboot_setup(char *str) break; case 's': - if (isdigit(*(str+1))) - reboot_cpu = simple_strtoul(str+1, NULL, 0); - else if (str[1] == 'm' && str[2] == 'p' && - isdigit(*(str+3))) - reboot_cpu = simple_strtoul(str+3, NULL, 0); - else + { + int rc; + + if (isdigit(*(str+1))) { + rc = kstrtoint(str+1, 0, &reboot_cpu); + if (rc) + return rc; + } else if (str[1] == 'm' && str[2] == 'p' && + isdigit(*(str+3))) { + rc = kstrtoint(str+3, 0, &reboot_cpu); + if (rc) + return rc; + } else reboot_mode = REBOOT_SOFT; break; - + } case 'g': reboot_mode = REBOOT_GPIO; break; diff --git a/kernel/res_counter.c b/kernel/res_counter.c index 51dbac6a3633..e791130f85a7 100644 --- a/kernel/res_counter.c +++ b/kernel/res_counter.c @@ -186,8 +186,11 @@ int res_counter_memparse_write_strategy(const char *buf, /* return RES_COUNTER_MAX(unlimited) if "-1" is specified */ if (*buf == '-') { - res = simple_strtoull(buf + 1, &end, 10); - if (res != 1 || *end != '\0') + int rc = kstrtoull(buf + 1, 10, &res); + + if (rc) + return rc; + if (res != 1) return -EINVAL; *resp = RES_COUNTER_MAX; return 0; diff --git a/kernel/resource.c b/kernel/resource.c index 8957d686e29b..3c2237ac32db 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -1288,13 +1288,10 @@ int iomem_map_sanity_check(resource_size_t addr, unsigned long size) if (p->flags & IORESOURCE_BUSY) continue; - printk(KERN_WARNING "resource map sanity check conflict: " - "0x%llx 0x%llx 0x%llx 0x%llx %s\n", + printk(KERN_WARNING "resource sanity check: requesting [mem %#010llx-%#010llx], which spans more than %s %pR\n", (unsigned long long)addr, (unsigned long long)(addr + size - 1), - (unsigned long long)p->start, - (unsigned long long)p->end, - p->name); + p->name, p); err = -1; break; } diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 084d17f89139..48e78b657d23 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -90,6 +90,22 @@ #define CREATE_TRACE_POINTS #include <trace/events/sched.h> +#ifdef smp_mb__before_atomic +void __smp_mb__before_atomic(void) +{ + smp_mb__before_atomic(); +} +EXPORT_SYMBOL(__smp_mb__before_atomic); +#endif + +#ifdef smp_mb__after_atomic +void __smp_mb__after_atomic(void) +{ + smp_mb__after_atomic(); +} +EXPORT_SYMBOL(__smp_mb__after_atomic); +#endif + void start_bandwidth_timer(struct hrtimer *period_timer, ktime_t period) { unsigned long delta; @@ -506,6 +522,39 @@ static inline void init_hrtick(void) #endif /* CONFIG_SCHED_HRTICK */ /* + * cmpxchg based fetch_or, macro so it works for different integer types + */ +#define fetch_or(ptr, val) \ +({ typeof(*(ptr)) __old, __val = *(ptr); \ + for (;;) { \ + __old = cmpxchg((ptr), __val, __val | (val)); \ + if (__old == __val) \ + break; \ + __val = __old; \ + } \ + __old; \ +}) + +#ifdef TIF_POLLING_NRFLAG +/* + * Atomically set TIF_NEED_RESCHED and test for TIF_POLLING_NRFLAG, + * this avoids any races wrt polling state changes and thereby avoids + * spurious IPIs. + */ +static bool set_nr_and_not_polling(struct task_struct *p) +{ + struct thread_info *ti = task_thread_info(p); + return !(fetch_or(&ti->flags, _TIF_NEED_RESCHED) & _TIF_POLLING_NRFLAG); +} +#else +static bool set_nr_and_not_polling(struct task_struct *p) +{ + set_tsk_need_resched(p); + return true; +} +#endif + +/* * resched_task - mark a task 'to be rescheduled now'. * * On UP this means the setting of the need_resched flag, on SMP it @@ -521,17 +570,15 @@ void resched_task(struct task_struct *p) if (test_tsk_need_resched(p)) return; - set_tsk_need_resched(p); - cpu = task_cpu(p); + if (cpu == smp_processor_id()) { + set_tsk_need_resched(p); set_preempt_need_resched(); return; } - /* NEED_RESCHED must be visible before we test polling */ - smp_mb(); - if (!tsk_is_polling(p)) + if (set_nr_and_not_polling(p)) smp_send_reschedule(cpu); } @@ -1320,7 +1367,7 @@ out: * leave kernel. */ if (p->mm && printk_ratelimit()) { - printk_sched("process %d (%s) no longer affine to cpu%d\n", + printk_deferred("process %d (%s) no longer affine to cpu%d\n", task_pid_nr(p), p->comm, cpu); } } @@ -3002,7 +3049,7 @@ EXPORT_SYMBOL(set_user_nice); int can_nice(const struct task_struct *p, const int nice) { /* convert nice value [19,-20] to rlimit style value [1,40] */ - int nice_rlim = 20 - nice; + int nice_rlim = nice_to_rlimit(nice); return (nice_rlim <= task_rlimit(p, RLIMIT_NICE) || capable(CAP_SYS_NICE)); @@ -3026,17 +3073,10 @@ SYSCALL_DEFINE1(nice, int, increment) * We don't have to worry. Conceptually one call occurs first * and we have a single winner. */ - if (increment < -40) - increment = -40; - if (increment > 40) - increment = 40; - + increment = clamp(increment, -NICE_WIDTH, NICE_WIDTH); nice = task_nice(current) + increment; - if (nice < MIN_NICE) - nice = MIN_NICE; - if (nice > MAX_NICE) - nice = MAX_NICE; + nice = clamp_val(nice, MIN_NICE, MAX_NICE); if (increment < 0 && !can_nice(current, nice)) return -EPERM; @@ -3626,13 +3666,11 @@ static int sched_copy_attr(struct sched_attr __user *uattr, */ attr->sched_nice = clamp(attr->sched_nice, MIN_NICE, MAX_NICE); -out: - return ret; + return 0; err_size: put_user(sizeof(*attr), &uattr->size); - ret = -E2BIG; - goto out; + return -E2BIG; } /** @@ -3792,7 +3830,7 @@ static int sched_read_attr(struct sched_attr __user *uattr, for (; addr < end; addr++) { if (*addr) - goto err_size; + return -EFBIG; } attr->size = usize; @@ -3802,12 +3840,7 @@ static int sched_read_attr(struct sched_attr __user *uattr, if (ret) return -EFAULT; -out: - return ret; - -err_size: - ret = -E2BIG; - goto out; + return 0; } /** @@ -4084,6 +4117,7 @@ static void __cond_resched(void) int __sched _cond_resched(void) { + rcu_cond_resched(); if (should_resched()) { __cond_resched(); return 1; @@ -4102,15 +4136,18 @@ EXPORT_SYMBOL(_cond_resched); */ int __cond_resched_lock(spinlock_t *lock) { + bool need_rcu_resched = rcu_should_resched(); int resched = should_resched(); int ret = 0; lockdep_assert_held(lock); - if (spin_needbreak(lock) || resched) { + if (spin_needbreak(lock) || resched || need_rcu_resched) { spin_unlock(lock); if (resched) __cond_resched(); + else if (unlikely(need_rcu_resched)) + rcu_resched(); else cpu_relax(); ret = 1; @@ -4124,6 +4161,7 @@ int __sched __cond_resched_softirq(void) { BUG_ON(!in_softirq()); + rcu_cond_resched(); /* BH disabled OK, just recording QSes. */ if (should_resched()) { local_bh_enable(); __cond_resched(); @@ -5072,10 +5110,20 @@ static struct notifier_block migration_notifier = { .priority = CPU_PRI_MIGRATION, }; +static void __cpuinit set_cpu_rq_start_time(void) +{ + int cpu = smp_processor_id(); + struct rq *rq = cpu_rq(cpu); + rq->age_stamp = sched_clock_cpu(cpu); +} + static int sched_cpu_active(struct notifier_block *nfb, unsigned long action, void *hcpu) { switch (action & ~CPU_TASKS_FROZEN) { + case CPU_STARTING: + set_cpu_rq_start_time(); + return NOTIFY_OK; case CPU_DOWN_FAILED: set_cpu_active((long)hcpu, true); return NOTIFY_OK; @@ -5284,7 +5332,8 @@ static int sd_degenerate(struct sched_domain *sd) SD_BALANCE_FORK | SD_BALANCE_EXEC | SD_SHARE_CPUPOWER | - SD_SHARE_PKG_RESOURCES)) { + SD_SHARE_PKG_RESOURCES | + SD_SHARE_POWERDOMAIN)) { if (sd->groups != sd->groups->next) return 0; } @@ -5315,7 +5364,8 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent) SD_BALANCE_EXEC | SD_SHARE_CPUPOWER | SD_SHARE_PKG_RESOURCES | - SD_PREFER_SIBLING); + SD_PREFER_SIBLING | + SD_SHARE_POWERDOMAIN); if (nr_node_ids == 1) pflags &= ~SD_SERIALIZE; } @@ -5589,17 +5639,6 @@ static int __init isolated_cpu_setup(char *str) __setup("isolcpus=", isolated_cpu_setup); -static const struct cpumask *cpu_cpu_mask(int cpu) -{ - return cpumask_of_node(cpu_to_node(cpu)); -} - -struct sd_data { - struct sched_domain **__percpu sd; - struct sched_group **__percpu sg; - struct sched_group_power **__percpu sgp; -}; - struct s_data { struct sched_domain ** __percpu sd; struct root_domain *rd; @@ -5612,21 +5651,6 @@ enum s_alloc { sa_none, }; -struct sched_domain_topology_level; - -typedef struct sched_domain *(*sched_domain_init_f)(struct sched_domain_topology_level *tl, int cpu); -typedef const struct cpumask *(*sched_domain_mask_f)(int cpu); - -#define SDTL_OVERLAP 0x01 - -struct sched_domain_topology_level { - sched_domain_init_f init; - sched_domain_mask_f mask; - int flags; - int numa_level; - struct sd_data data; -}; - /* * Build an iteration mask that can exclude certain CPUs from the upwards * domain traversal. @@ -5794,8 +5818,6 @@ build_sched_groups(struct sched_domain *sd, int cpu) continue; group = get_group(i, sdd, &sg); - cpumask_clear(sched_group_cpus(sg)); - sg->sgp->power = 0; cpumask_setall(sched_group_mask(sg)); for_each_cpu(j, span) { @@ -5845,44 +5867,11 @@ static void init_sched_groups_power(int cpu, struct sched_domain *sd) atomic_set(&sg->sgp->nr_busy_cpus, sg->group_weight); } -int __weak arch_sd_sibling_asym_packing(void) -{ - return 0*SD_ASYM_PACKING; -} - /* * Initializers for schedule domains * Non-inlined to reduce accumulated stack pressure in build_sched_domains() */ -#ifdef CONFIG_SCHED_DEBUG -# define SD_INIT_NAME(sd, type) sd->name = #type -#else -# define SD_INIT_NAME(sd, type) do { } while (0) -#endif - -#define SD_INIT_FUNC(type) \ -static noinline struct sched_domain * \ -sd_init_##type(struct sched_domain_topology_level *tl, int cpu) \ -{ \ - struct sched_domain *sd = *per_cpu_ptr(tl->data.sd, cpu); \ - *sd = SD_##type##_INIT; \ - SD_INIT_NAME(sd, type); \ - sd->private = &tl->data; \ - return sd; \ -} - -SD_INIT_FUNC(CPU) -#ifdef CONFIG_SCHED_SMT - SD_INIT_FUNC(SIBLING) -#endif -#ifdef CONFIG_SCHED_MC - SD_INIT_FUNC(MC) -#endif -#ifdef CONFIG_SCHED_BOOK - SD_INIT_FUNC(BOOK) -#endif - static int default_relax_domain_level = -1; int sched_domain_level_max; @@ -5970,99 +5959,154 @@ static void claim_allocations(int cpu, struct sched_domain *sd) *per_cpu_ptr(sdd->sgp, cpu) = NULL; } -#ifdef CONFIG_SCHED_SMT -static const struct cpumask *cpu_smt_mask(int cpu) -{ - return topology_thread_cpumask(cpu); -} -#endif - -/* - * Topology list, bottom-up. - */ -static struct sched_domain_topology_level default_topology[] = { -#ifdef CONFIG_SCHED_SMT - { sd_init_SIBLING, cpu_smt_mask, }, -#endif -#ifdef CONFIG_SCHED_MC - { sd_init_MC, cpu_coregroup_mask, }, -#endif -#ifdef CONFIG_SCHED_BOOK - { sd_init_BOOK, cpu_book_mask, }, -#endif - { sd_init_CPU, cpu_cpu_mask, }, - { NULL, }, -}; - -static struct sched_domain_topology_level *sched_domain_topology = default_topology; - -#define for_each_sd_topology(tl) \ - for (tl = sched_domain_topology; tl->init; tl++) - #ifdef CONFIG_NUMA - static int sched_domains_numa_levels; static int *sched_domains_numa_distance; static struct cpumask ***sched_domains_numa_masks; static int sched_domains_curr_level; +#endif -static inline int sd_local_flags(int level) -{ - if (sched_domains_numa_distance[level] > RECLAIM_DISTANCE) - return 0; - - return SD_BALANCE_EXEC | SD_BALANCE_FORK | SD_WAKE_AFFINE; -} +/* + * SD_flags allowed in topology descriptions. + * + * SD_SHARE_CPUPOWER - describes SMT topologies + * SD_SHARE_PKG_RESOURCES - describes shared caches + * SD_NUMA - describes NUMA topologies + * SD_SHARE_POWERDOMAIN - describes shared power domain + * + * Odd one out: + * SD_ASYM_PACKING - describes SMT quirks + */ +#define TOPOLOGY_SD_FLAGS \ + (SD_SHARE_CPUPOWER | \ + SD_SHARE_PKG_RESOURCES | \ + SD_NUMA | \ + SD_ASYM_PACKING | \ + SD_SHARE_POWERDOMAIN) static struct sched_domain * -sd_numa_init(struct sched_domain_topology_level *tl, int cpu) +sd_init(struct sched_domain_topology_level *tl, int cpu) { struct sched_domain *sd = *per_cpu_ptr(tl->data.sd, cpu); - int level = tl->numa_level; - int sd_weight = cpumask_weight( - sched_domains_numa_masks[level][cpu_to_node(cpu)]); + int sd_weight, sd_flags = 0; + +#ifdef CONFIG_NUMA + /* + * Ugly hack to pass state to sd_numa_mask()... + */ + sched_domains_curr_level = tl->numa_level; +#endif + + sd_weight = cpumask_weight(tl->mask(cpu)); + + if (tl->sd_flags) + sd_flags = (*tl->sd_flags)(); + if (WARN_ONCE(sd_flags & ~TOPOLOGY_SD_FLAGS, + "wrong sd_flags in topology description\n")) + sd_flags &= ~TOPOLOGY_SD_FLAGS; *sd = (struct sched_domain){ .min_interval = sd_weight, .max_interval = 2*sd_weight, .busy_factor = 32, .imbalance_pct = 125, - .cache_nice_tries = 2, - .busy_idx = 3, - .idle_idx = 2, + + .cache_nice_tries = 0, + .busy_idx = 0, + .idle_idx = 0, .newidle_idx = 0, .wake_idx = 0, .forkexec_idx = 0, .flags = 1*SD_LOAD_BALANCE | 1*SD_BALANCE_NEWIDLE - | 0*SD_BALANCE_EXEC - | 0*SD_BALANCE_FORK + | 1*SD_BALANCE_EXEC + | 1*SD_BALANCE_FORK | 0*SD_BALANCE_WAKE - | 0*SD_WAKE_AFFINE + | 1*SD_WAKE_AFFINE | 0*SD_SHARE_CPUPOWER | 0*SD_SHARE_PKG_RESOURCES - | 1*SD_SERIALIZE + | 0*SD_SERIALIZE | 0*SD_PREFER_SIBLING - | 1*SD_NUMA - | sd_local_flags(level) + | 0*SD_NUMA + | sd_flags , + .last_balance = jiffies, .balance_interval = sd_weight, + .smt_gain = 0, .max_newidle_lb_cost = 0, .next_decay_max_lb_cost = jiffies, +#ifdef CONFIG_SCHED_DEBUG + .name = tl->name, +#endif }; - SD_INIT_NAME(sd, NUMA); - sd->private = &tl->data; /* - * Ugly hack to pass state to sd_numa_mask()... + * Convert topological properties into behaviour. */ - sched_domains_curr_level = tl->numa_level; + + if (sd->flags & SD_SHARE_CPUPOWER) { + sd->imbalance_pct = 110; + sd->smt_gain = 1178; /* ~15% */ + + } else if (sd->flags & SD_SHARE_PKG_RESOURCES) { + sd->imbalance_pct = 117; + sd->cache_nice_tries = 1; + sd->busy_idx = 2; + +#ifdef CONFIG_NUMA + } else if (sd->flags & SD_NUMA) { + sd->cache_nice_tries = 2; + sd->busy_idx = 3; + sd->idle_idx = 2; + + sd->flags |= SD_SERIALIZE; + if (sched_domains_numa_distance[tl->numa_level] > RECLAIM_DISTANCE) { + sd->flags &= ~(SD_BALANCE_EXEC | + SD_BALANCE_FORK | + SD_WAKE_AFFINE); + } + +#endif + } else { + sd->flags |= SD_PREFER_SIBLING; + sd->cache_nice_tries = 1; + sd->busy_idx = 2; + sd->idle_idx = 1; + } + + sd->private = &tl->data; return sd; } +/* + * Topology list, bottom-up. + */ +static struct sched_domain_topology_level default_topology[] = { +#ifdef CONFIG_SCHED_SMT + { cpu_smt_mask, cpu_smt_flags, SD_INIT_NAME(SMT) }, +#endif +#ifdef CONFIG_SCHED_MC + { cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) }, +#endif + { cpu_cpu_mask, SD_INIT_NAME(DIE) }, + { NULL, }, +}; + +struct sched_domain_topology_level *sched_domain_topology = default_topology; + +#define for_each_sd_topology(tl) \ + for (tl = sched_domain_topology; tl->mask; tl++) + +void set_sched_topology(struct sched_domain_topology_level *tl) +{ + sched_domain_topology = tl; +} + +#ifdef CONFIG_NUMA + static const struct cpumask *sd_numa_mask(int cpu) { return sched_domains_numa_masks[sched_domains_curr_level][cpu_to_node(cpu)]; @@ -6206,7 +6250,10 @@ static void sched_init_numa(void) } } - tl = kzalloc((ARRAY_SIZE(default_topology) + level) * + /* Compute default topology size */ + for (i = 0; sched_domain_topology[i].mask; i++); + + tl = kzalloc((i + level + 1) * sizeof(struct sched_domain_topology_level), GFP_KERNEL); if (!tl) return; @@ -6214,18 +6261,19 @@ static void sched_init_numa(void) /* * Copy the default topology bits.. */ - for (i = 0; default_topology[i].init; i++) - tl[i] = default_topology[i]; + for (i = 0; sched_domain_topology[i].mask; i++) + tl[i] = sched_domain_topology[i]; /* * .. and append 'j' levels of NUMA goodness. */ for (j = 0; j < level; i++, j++) { tl[i] = (struct sched_domain_topology_level){ - .init = sd_numa_init, .mask = sd_numa_mask, + .sd_flags = cpu_numa_flags, .flags = SDTL_OVERLAP, .numa_level = j, + SD_INIT_NAME(NUMA) }; } @@ -6383,7 +6431,7 @@ struct sched_domain *build_sched_domain(struct sched_domain_topology_level *tl, const struct cpumask *cpu_map, struct sched_domain_attr *attr, struct sched_domain *child, int cpu) { - struct sched_domain *sd = tl->init(tl, cpu); + struct sched_domain *sd = sd_init(tl, cpu); if (!sd) return child; @@ -6953,6 +7001,7 @@ void __init sched_init(void) if (cpu_isolated_map == NULL) zalloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT); idle_thread_set_boot_cpu(); + set_cpu_rq_start_time(); #endif init_sched_fair_class(); diff --git a/kernel/sched/cpupri.c b/kernel/sched/cpupri.c index 8834243abee2..981fcd7dc394 100644 --- a/kernel/sched/cpupri.c +++ b/kernel/sched/cpupri.c @@ -165,7 +165,7 @@ void cpupri_set(struct cpupri *cp, int cpu, int newpri) * do a write memory barrier, and then update the count, to * make sure the vector is visible when count is set. */ - smp_mb__before_atomic_inc(); + smp_mb__before_atomic(); atomic_inc(&(vec)->count); do_mb = 1; } @@ -185,14 +185,14 @@ void cpupri_set(struct cpupri *cp, int cpu, int newpri) * the new priority vec. */ if (do_mb) - smp_mb__after_atomic_inc(); + smp_mb__after_atomic(); /* * When removing from the vector, we decrement the counter first * do a memory barrier and then clear the mask. */ atomic_dec(&(vec)->count); - smp_mb__after_atomic_inc(); + smp_mb__after_atomic(); cpumask_clear_cpu(cpu, vec->mask); } diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 14bc348ba3b4..2b8cbf09d1a4 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -348,12 +348,7 @@ static void replenish_dl_entity(struct sched_dl_entity *dl_se, * entity. */ if (dl_time_before(dl_se->deadline, rq_clock(rq))) { - static bool lag_once = false; - - if (!lag_once) { - lag_once = true; - printk_sched("sched: DL replenish lagged to much\n"); - } + printk_deferred_once("sched: DL replenish lagged to much\n"); dl_se->deadline = rq_clock(rq) + pi_se->dl_deadline; dl_se->runtime = pi_se->dl_runtime; } @@ -528,7 +523,7 @@ again: * We need to take care of a possible races here. In fact, the * task might have changed its scheduling policy to something * different from SCHED_DEADLINE or changed its reservation - * parameters (through sched_setscheduler()). + * parameters (through sched_setattr()). */ if (!dl_task(p) || dl_se->dl_new) goto unlock; @@ -749,7 +744,7 @@ void inc_dl_tasks(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq) WARN_ON(!dl_prio(prio)); dl_rq->dl_nr_running++; - inc_nr_running(rq_of_dl_rq(dl_rq)); + add_nr_running(rq_of_dl_rq(dl_rq), 1); inc_dl_deadline(dl_rq, deadline); inc_dl_migration(dl_se, dl_rq); @@ -763,7 +758,7 @@ void dec_dl_tasks(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq) WARN_ON(!dl_prio(prio)); WARN_ON(!dl_rq->dl_nr_running); dl_rq->dl_nr_running--; - dec_nr_running(rq_of_dl_rq(dl_rq)); + sub_nr_running(rq_of_dl_rq(dl_rq), 1); dec_dl_deadline(dl_rq, dl_se->deadline); dec_dl_migration(dl_se, dl_rq); diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 8cbe2d2c16de..17de1956ddad 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1095,6 +1095,34 @@ static void task_numa_assign(struct task_numa_env *env, env->best_cpu = env->dst_cpu; } +static bool load_too_imbalanced(long orig_src_load, long orig_dst_load, + long src_load, long dst_load, + struct task_numa_env *env) +{ + long imb, old_imb; + + /* We care about the slope of the imbalance, not the direction. */ + if (dst_load < src_load) + swap(dst_load, src_load); + + /* Is the difference below the threshold? */ + imb = dst_load * 100 - src_load * env->imbalance_pct; + if (imb <= 0) + return false; + + /* + * The imbalance is above the allowed threshold. + * Compare it with the old imbalance. + */ + if (orig_dst_load < orig_src_load) + swap(orig_dst_load, orig_src_load); + + old_imb = orig_dst_load * 100 - orig_src_load * env->imbalance_pct; + + /* Would this change make things worse? */ + return (old_imb > imb); +} + /* * This checks if the overall compute and NUMA accesses of the system would * be improved if the source tasks was migrated to the target dst_cpu taking @@ -1107,7 +1135,8 @@ static void task_numa_compare(struct task_numa_env *env, struct rq *src_rq = cpu_rq(env->src_cpu); struct rq *dst_rq = cpu_rq(env->dst_cpu); struct task_struct *cur; - long dst_load, src_load; + long orig_src_load, src_load; + long orig_dst_load, dst_load; long load; long imp = (groupimp > 0) ? groupimp : taskimp; @@ -1181,13 +1210,13 @@ static void task_numa_compare(struct task_numa_env *env, * In the overloaded case, try and keep the load balanced. */ balance: - dst_load = env->dst_stats.load; - src_load = env->src_stats.load; + orig_dst_load = env->dst_stats.load; + orig_src_load = env->src_stats.load; /* XXX missing power terms */ load = task_h_load(env->p); - dst_load += load; - src_load -= load; + dst_load = orig_dst_load + load; + src_load = orig_src_load - load; if (cur) { load = task_h_load(cur); @@ -1195,11 +1224,8 @@ balance: src_load += load; } - /* make src_load the smaller */ - if (dst_load < src_load) - swap(dst_load, src_load); - - if (src_load * env->imbalance_pct < dst_load * 100) + if (load_too_imbalanced(orig_src_load, orig_dst_load, + src_load, dst_load, env)) goto unlock; assign: @@ -1301,7 +1327,16 @@ static int task_numa_migrate(struct task_struct *p) if (env.best_cpu == -1) return -EAGAIN; - sched_setnuma(p, env.dst_nid); + /* + * If the task is part of a workload that spans multiple NUMA nodes, + * and is migrating into one of the workload's active nodes, remember + * this node as the task's preferred numa node, so the workload can + * settle down. + * A task that migrated to a second choice node will be better off + * trying for a better one later. Do not set the preferred node here. + */ + if (p->numa_group && node_isset(env.dst_nid, p->numa_group->active_nodes)) + sched_setnuma(p, env.dst_nid); /* * Reset the scan period if the task is being rescheduled on an @@ -1326,12 +1361,15 @@ static int task_numa_migrate(struct task_struct *p) /* Attempt to migrate a task to a CPU on the preferred node. */ static void numa_migrate_preferred(struct task_struct *p) { + unsigned long interval = HZ; + /* This task has no NUMA fault statistics yet */ if (unlikely(p->numa_preferred_nid == -1 || !p->numa_faults_memory)) return; /* Periodically retry migrating the task to the preferred node */ - p->numa_migrate_retry = jiffies + HZ; + interval = min(interval, msecs_to_jiffies(p->numa_scan_period) / 16); + p->numa_migrate_retry = jiffies + interval; /* Success if task is already running on preferred CPU */ if (task_node(p) == p->numa_preferred_nid) @@ -1739,6 +1777,7 @@ void task_numa_fault(int last_cpupid, int mem_node, int pages, int flags) struct task_struct *p = current; bool migrated = flags & TNF_MIGRATED; int cpu_node = task_node(current); + int local = !!(flags & TNF_FAULT_LOCAL); int priv; if (!numabalancing_enabled) @@ -1787,6 +1826,17 @@ void task_numa_fault(int last_cpupid, int mem_node, int pages, int flags) task_numa_group(p, last_cpupid, flags, &priv); } + /* + * If a workload spans multiple NUMA nodes, a shared fault that + * occurs wholly within the set of nodes that the workload is + * actively using should be counted as local. This allows the + * scan rate to slow down when a workload has settled down. + */ + if (!priv && !local && p->numa_group && + node_isset(cpu_node, p->numa_group->active_nodes) && + node_isset(mem_node, p->numa_group->active_nodes)) + local = 1; + task_numa_placement(p); /* @@ -1801,7 +1851,7 @@ void task_numa_fault(int last_cpupid, int mem_node, int pages, int flags) p->numa_faults_buffer_memory[task_faults_idx(mem_node, priv)] += pages; p->numa_faults_buffer_cpu[task_faults_idx(cpu_node, priv)] += pages; - p->numa_faults_locality[!!(flags & TNF_FAULT_LOCAL)] += pages; + p->numa_faults_locality[local] += pages; } static void reset_ptenuma_scan(struct task_struct *p) @@ -3302,7 +3352,7 @@ static void throttle_cfs_rq(struct cfs_rq *cfs_rq) } if (!se) - rq->nr_running -= task_delta; + sub_nr_running(rq, task_delta); cfs_rq->throttled = 1; cfs_rq->throttled_clock = rq_clock(rq); @@ -3353,7 +3403,7 @@ void unthrottle_cfs_rq(struct cfs_rq *cfs_rq) } if (!se) - rq->nr_running += task_delta; + add_nr_running(rq, task_delta); /* determine whether we need to wake up potentially idle cpu */ if (rq->curr == rq->idle && rq->cfs.nr_running) @@ -3885,7 +3935,7 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags) if (!se) { update_rq_runnable_avg(rq, rq->nr_running); - inc_nr_running(rq); + add_nr_running(rq, 1); } hrtick_update(rq); } @@ -3945,7 +3995,7 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags) } if (!se) { - dec_nr_running(rq); + sub_nr_running(rq, 1); update_rq_runnable_avg(rq, 1); } hrtick_update(rq); @@ -4016,7 +4066,7 @@ static void record_wakee(struct task_struct *p) * about the loss. */ if (jiffies > current->wakee_flip_decay_ts + HZ) { - current->wakee_flips = 0; + current->wakee_flips >>= 1; current->wakee_flip_decay_ts = jiffies; } @@ -4450,10 +4500,10 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_f sd = tmp; } - if (affine_sd) { - if (cpu != prev_cpu && wake_affine(affine_sd, p, sync)) - prev_cpu = cpu; + if (affine_sd && cpu != prev_cpu && wake_affine(affine_sd, p, sync)) + prev_cpu = cpu; + if (sd_flag & SD_BALANCE_WAKE) { new_cpu = select_idle_sibling(p, prev_cpu); goto unlock; } @@ -4521,6 +4571,9 @@ migrate_task_rq_fair(struct task_struct *p, int next_cpu) atomic_long_add(se->avg.load_avg_contrib, &cfs_rq->removed_load); } + + /* We have migrated, no longer consider this task hot */ + se->exec_start = 0; } #endif /* CONFIG_SMP */ @@ -5071,6 +5124,7 @@ task_hot(struct task_struct *p, u64 now) /* Returns true if the destination node has incurred more faults */ static bool migrate_improves_locality(struct task_struct *p, struct lb_env *env) { + struct numa_group *numa_group = rcu_dereference(p->numa_group); int src_nid, dst_nid; if (!sched_feat(NUMA_FAVOUR_HIGHER) || !p->numa_faults_memory || @@ -5084,21 +5138,29 @@ static bool migrate_improves_locality(struct task_struct *p, struct lb_env *env) if (src_nid == dst_nid) return false; - /* Always encourage migration to the preferred node. */ - if (dst_nid == p->numa_preferred_nid) - return true; + if (numa_group) { + /* Task is already in the group's interleave set. */ + if (node_isset(src_nid, numa_group->active_nodes)) + return false; + + /* Task is moving into the group's interleave set. */ + if (node_isset(dst_nid, numa_group->active_nodes)) + return true; - /* If both task and group weight improve, this move is a winner. */ - if (task_weight(p, dst_nid) > task_weight(p, src_nid) && - group_weight(p, dst_nid) > group_weight(p, src_nid)) + return group_faults(p, dst_nid) > group_faults(p, src_nid); + } + + /* Encourage migration to the preferred node. */ + if (dst_nid == p->numa_preferred_nid) return true; - return false; + return task_faults(p, dst_nid) > task_faults(p, src_nid); } static bool migrate_degrades_locality(struct task_struct *p, struct lb_env *env) { + struct numa_group *numa_group = rcu_dereference(p->numa_group); int src_nid, dst_nid; if (!sched_feat(NUMA) || !sched_feat(NUMA_RESIST_LOWER)) @@ -5113,16 +5175,23 @@ static bool migrate_degrades_locality(struct task_struct *p, struct lb_env *env) if (src_nid == dst_nid) return false; + if (numa_group) { + /* Task is moving within/into the group's interleave set. */ + if (node_isset(dst_nid, numa_group->active_nodes)) + return false; + + /* Task is moving out of the group's interleave set. */ + if (node_isset(src_nid, numa_group->active_nodes)) + return true; + + return group_faults(p, dst_nid) < group_faults(p, src_nid); + } + /* Migrating away from the preferred node is always bad. */ if (src_nid == p->numa_preferred_nid) return true; - /* If either task or group weight get worse, don't do it. */ - if (task_weight(p, dst_nid) < task_weight(p, src_nid) || - group_weight(p, dst_nid) < group_weight(p, src_nid)) - return true; - - return false; + return task_faults(p, dst_nid) < task_faults(p, src_nid); } #else @@ -5565,6 +5634,7 @@ static unsigned long scale_rt_power(int cpu) { struct rq *rq = cpu_rq(cpu); u64 total, available, age_stamp, avg; + s64 delta; /* * Since we're reading these variables without serialization make sure @@ -5573,7 +5643,11 @@ static unsigned long scale_rt_power(int cpu) age_stamp = ACCESS_ONCE(rq->age_stamp); avg = ACCESS_ONCE(rq->rt_avg); - total = sched_avg_period() + (rq_clock(rq) - age_stamp); + delta = rq_clock(rq) - age_stamp; + if (unlikely(delta < 0)) + delta = 0; + + total = sched_avg_period() + delta; if (unlikely(total < avg)) { /* Ensures that power won't end up being negative */ @@ -6641,17 +6715,44 @@ out: return ld_moved; } +static inline unsigned long +get_sd_balance_interval(struct sched_domain *sd, int cpu_busy) +{ + unsigned long interval = sd->balance_interval; + + if (cpu_busy) + interval *= sd->busy_factor; + + /* scale ms to jiffies */ + interval = msecs_to_jiffies(interval); + interval = clamp(interval, 1UL, max_load_balance_interval); + + return interval; +} + +static inline void +update_next_balance(struct sched_domain *sd, int cpu_busy, unsigned long *next_balance) +{ + unsigned long interval, next; + + interval = get_sd_balance_interval(sd, cpu_busy); + next = sd->last_balance + interval; + + if (time_after(*next_balance, next)) + *next_balance = next; +} + /* * idle_balance is called by schedule() if this_cpu is about to become * idle. Attempts to pull tasks from other CPUs. */ static int idle_balance(struct rq *this_rq) { + unsigned long next_balance = jiffies + HZ; + int this_cpu = this_rq->cpu; struct sched_domain *sd; int pulled_task = 0; - unsigned long next_balance = jiffies + HZ; u64 curr_cost = 0; - int this_cpu = this_rq->cpu; idle_enter_fair(this_rq); @@ -6661,8 +6762,15 @@ static int idle_balance(struct rq *this_rq) */ this_rq->idle_stamp = rq_clock(this_rq); - if (this_rq->avg_idle < sysctl_sched_migration_cost) + if (this_rq->avg_idle < sysctl_sched_migration_cost) { + rcu_read_lock(); + sd = rcu_dereference_check_sched_domain(this_rq->sd); + if (sd) + update_next_balance(sd, 0, &next_balance); + rcu_read_unlock(); + goto out; + } /* * Drop the rq->lock, but keep IRQ/preempt disabled. @@ -6672,20 +6780,20 @@ static int idle_balance(struct rq *this_rq) update_blocked_averages(this_cpu); rcu_read_lock(); for_each_domain(this_cpu, sd) { - unsigned long interval; int continue_balancing = 1; u64 t0, domain_cost; if (!(sd->flags & SD_LOAD_BALANCE)) continue; - if (this_rq->avg_idle < curr_cost + sd->max_newidle_lb_cost) + if (this_rq->avg_idle < curr_cost + sd->max_newidle_lb_cost) { + update_next_balance(sd, 0, &next_balance); break; + } if (sd->flags & SD_BALANCE_NEWIDLE) { t0 = sched_clock_cpu(this_cpu); - /* If we've pulled tasks over stop searching: */ pulled_task = load_balance(this_cpu, this_rq, sd, CPU_NEWLY_IDLE, &continue_balancing); @@ -6697,10 +6805,13 @@ static int idle_balance(struct rq *this_rq) curr_cost += domain_cost; } - interval = msecs_to_jiffies(sd->balance_interval); - if (time_after(next_balance, sd->last_balance + interval)) - next_balance = sd->last_balance + interval; - if (pulled_task) + update_next_balance(sd, 0, &next_balance); + + /* + * Stop searching for tasks to pull if there are + * now runnable tasks on this rq. + */ + if (pulled_task || this_rq->nr_running > 0) break; } rcu_read_unlock(); @@ -6718,20 +6829,13 @@ static int idle_balance(struct rq *this_rq) if (this_rq->cfs.h_nr_running && !pulled_task) pulled_task = 1; - if (pulled_task || time_after(jiffies, this_rq->next_balance)) { - /* - * We are going idle. next_balance may be set based on - * a busy processor. So reset next_balance. - */ +out: + /* Move the next balance forward */ + if (time_after(this_rq->next_balance, next_balance)) this_rq->next_balance = next_balance; - } -out: /* Is there a task of a high priority class? */ - if (this_rq->nr_running != this_rq->cfs.h_nr_running && - ((this_rq->stop && this_rq->stop->on_rq) || - this_rq->dl.dl_nr_running || - (this_rq->rt.rt_nr_running && !rt_rq_throttled(&this_rq->rt)))) + if (this_rq->nr_running != this_rq->cfs.h_nr_running) pulled_task = -1; if (pulled_task) { @@ -7012,16 +7116,9 @@ static void rebalance_domains(struct rq *rq, enum cpu_idle_type idle) break; } - interval = sd->balance_interval; - if (idle != CPU_IDLE) - interval *= sd->busy_factor; - - /* scale ms to jiffies */ - interval = msecs_to_jiffies(interval); - interval = clamp(interval, 1UL, max_load_balance_interval); + interval = get_sd_balance_interval(sd, idle != CPU_IDLE); need_serialize = sd->flags & SD_SERIALIZE; - if (need_serialize) { if (!spin_trylock(&balancing)) goto out; @@ -7037,6 +7134,7 @@ static void rebalance_domains(struct rq *rq, enum cpu_idle_type idle) idle = idle_cpu(cpu) ? CPU_IDLE : CPU_NOT_IDLE; } sd->last_balance = jiffies; + interval = get_sd_balance_interval(sd, idle != CPU_IDLE); } if (need_serialize) spin_unlock(&balancing); diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c index 8f4390a079c7..25b9423abce9 100644 --- a/kernel/sched/idle.c +++ b/kernel/sched/idle.c @@ -67,24 +67,21 @@ void __weak arch_cpu_idle(void) * cpuidle_idle_call - the main idle function * * NOTE: no locks or semaphores should be used here - * return non-zero on failure */ -static int cpuidle_idle_call(void) +static void cpuidle_idle_call(void) { struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices); struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev); - int next_state, entered_state, ret; + int next_state, entered_state; bool broadcast; /* * Check if the idle task must be rescheduled. If it is the - * case, exit the function after re-enabling the local irq and - * set again the polling flag + * case, exit the function after re-enabling the local irq. */ - if (current_clr_polling_and_test()) { + if (need_resched()) { local_irq_enable(); - __current_set_polling(); - return 0; + return; } /* @@ -101,96 +98,79 @@ static int cpuidle_idle_call(void) rcu_idle_enter(); /* - * Check if the cpuidle framework is ready, otherwise fallback - * to the default arch specific idle method + * Ask the cpuidle framework to choose a convenient idle state. + * Fall back to the default arch idle method on errors. */ - ret = cpuidle_enabled(drv, dev); - - if (!ret) { + next_state = cpuidle_select(drv, dev); + if (next_state < 0) { +use_default: /* - * Ask the governor to choose an idle state it thinks - * it is convenient to go to. There is *always* a - * convenient idle state + * We can't use the cpuidle framework, let's use the default + * idle routine. */ - next_state = cpuidle_select(drv, dev); - - /* - * The idle task must be scheduled, it is pointless to - * go to idle, just update no idle residency and get - * out of this function - */ - if (current_clr_polling_and_test()) { - dev->last_residency = 0; - entered_state = next_state; + if (current_clr_polling_and_test()) local_irq_enable(); - } else { - broadcast = !!(drv->states[next_state].flags & - CPUIDLE_FLAG_TIMER_STOP); - - if (broadcast) - /* - * Tell the time framework to switch - * to a broadcast timer because our - * local timer will be shutdown. If a - * local timer is used from another - * cpu as a broadcast timer, this call - * may fail if it is not available - */ - ret = clockevents_notify( - CLOCK_EVT_NOTIFY_BROADCAST_ENTER, - &dev->cpu); - - if (!ret) { - trace_cpu_idle_rcuidle(next_state, dev->cpu); - - /* - * Enter the idle state previously - * returned by the governor - * decision. This function will block - * until an interrupt occurs and will - * take care of re-enabling the local - * interrupts - */ - entered_state = cpuidle_enter(drv, dev, - next_state); - - trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, - dev->cpu); - - if (broadcast) - clockevents_notify( - CLOCK_EVT_NOTIFY_BROADCAST_EXIT, - &dev->cpu); - - /* - * Give the governor an opportunity to reflect on the - * outcome - */ - cpuidle_reflect(dev, entered_state); - } - } + else + arch_cpu_idle(); + + goto exit_idle; } + /* - * We can't use the cpuidle framework, let's use the default - * idle routine + * The idle task must be scheduled, it is pointless to + * go to idle, just update no idle residency and get + * out of this function */ - if (ret) - arch_cpu_idle(); + if (current_clr_polling_and_test()) { + dev->last_residency = 0; + entered_state = next_state; + local_irq_enable(); + goto exit_idle; + } + + broadcast = !!(drv->states[next_state].flags & CPUIDLE_FLAG_TIMER_STOP); + /* + * Tell the time framework to switch to a broadcast timer + * because our local timer will be shutdown. If a local timer + * is used from another cpu as a broadcast timer, this call may + * fail if it is not available + */ + if (broadcast && + clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu)) + goto use_default; + + trace_cpu_idle_rcuidle(next_state, dev->cpu); + + /* + * Enter the idle state previously returned by the governor decision. + * This function will block until an interrupt occurs and will take + * care of re-enabling the local interrupts + */ + entered_state = cpuidle_enter(drv, dev, next_state); + + trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, dev->cpu); + + if (broadcast) + clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu); + + /* + * Give the governor an opportunity to reflect on the outcome + */ + cpuidle_reflect(dev, entered_state); + +exit_idle: __current_set_polling(); /* - * It is up to the idle functions to enable back the local - * interrupt + * It is up to the idle functions to reenable local interrupts */ if (WARN_ON_ONCE(irqs_disabled())) local_irq_enable(); rcu_idle_exit(); start_critical_timings(); - - return 0; } /* diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index bd2267ad404f..b3512f1afce9 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -79,6 +79,8 @@ void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq) rt_rq->overloaded = 0; plist_head_init(&rt_rq->pushable_tasks); #endif + /* We start is dequeued state, because no RT tasks are queued */ + rt_rq->rt_queued = 0; rt_rq->rt_time = 0; rt_rq->rt_throttled = 0; @@ -112,6 +114,13 @@ static inline struct rt_rq *rt_rq_of_se(struct sched_rt_entity *rt_se) return rt_se->rt_rq; } +static inline struct rq *rq_of_rt_se(struct sched_rt_entity *rt_se) +{ + struct rt_rq *rt_rq = rt_se->rt_rq; + + return rt_rq->rq; +} + void free_rt_sched_group(struct task_group *tg) { int i; @@ -211,10 +220,16 @@ static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq) return container_of(rt_rq, struct rq, rt); } -static inline struct rt_rq *rt_rq_of_se(struct sched_rt_entity *rt_se) +static inline struct rq *rq_of_rt_se(struct sched_rt_entity *rt_se) { struct task_struct *p = rt_task_of(rt_se); - struct rq *rq = task_rq(p); + + return task_rq(p); +} + +static inline struct rt_rq *rt_rq_of_se(struct sched_rt_entity *rt_se) +{ + struct rq *rq = rq_of_rt_se(rt_se); return &rq->rt; } @@ -391,6 +406,9 @@ static inline void set_post_schedule(struct rq *rq) } #endif /* CONFIG_SMP */ +static void enqueue_top_rt_rq(struct rt_rq *rt_rq); +static void dequeue_top_rt_rq(struct rt_rq *rt_rq); + static inline int on_rt_rq(struct sched_rt_entity *rt_se) { return !list_empty(&rt_se->run_list); @@ -452,8 +470,11 @@ static void sched_rt_rq_enqueue(struct rt_rq *rt_rq) rt_se = rt_rq->tg->rt_se[cpu]; if (rt_rq->rt_nr_running) { - if (rt_se && !on_rt_rq(rt_se)) + if (!rt_se) + enqueue_top_rt_rq(rt_rq); + else if (!on_rt_rq(rt_se)) enqueue_rt_entity(rt_se, false); + if (rt_rq->highest_prio.curr < curr->prio) resched_task(curr); } @@ -466,10 +487,17 @@ static void sched_rt_rq_dequeue(struct rt_rq *rt_rq) rt_se = rt_rq->tg->rt_se[cpu]; - if (rt_se && on_rt_rq(rt_se)) + if (!rt_se) + dequeue_top_rt_rq(rt_rq); + else if (on_rt_rq(rt_se)) dequeue_rt_entity(rt_se); } +static inline int rt_rq_throttled(struct rt_rq *rt_rq) +{ + return rt_rq->rt_throttled && !rt_rq->rt_nr_boosted; +} + static int rt_se_boosted(struct sched_rt_entity *rt_se) { struct rt_rq *rt_rq = group_rt_rq(rt_se); @@ -532,12 +560,23 @@ static inline struct rt_rq *group_rt_rq(struct sched_rt_entity *rt_se) static inline void sched_rt_rq_enqueue(struct rt_rq *rt_rq) { - if (rt_rq->rt_nr_running) - resched_task(rq_of_rt_rq(rt_rq)->curr); + struct rq *rq = rq_of_rt_rq(rt_rq); + + if (!rt_rq->rt_nr_running) + return; + + enqueue_top_rt_rq(rt_rq); + resched_task(rq->curr); } static inline void sched_rt_rq_dequeue(struct rt_rq *rt_rq) { + dequeue_top_rt_rq(rt_rq); +} + +static inline int rt_rq_throttled(struct rt_rq *rt_rq) +{ + return rt_rq->rt_throttled; } static inline const struct cpumask *sched_rt_period_mask(void) @@ -851,14 +890,8 @@ static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq) * but accrue some time due to boosting. */ if (likely(rt_b->rt_runtime)) { - static bool once = false; - rt_rq->rt_throttled = 1; - - if (!once) { - once = true; - printk_sched("sched: RT throttling activated\n"); - } + printk_deferred_once("sched: RT throttling activated\n"); } else { /* * In case we did anyway, make it go away, @@ -922,6 +955,38 @@ static void update_curr_rt(struct rq *rq) } } +static void +dequeue_top_rt_rq(struct rt_rq *rt_rq) +{ + struct rq *rq = rq_of_rt_rq(rt_rq); + + BUG_ON(&rq->rt != rt_rq); + + if (!rt_rq->rt_queued) + return; + + BUG_ON(!rq->nr_running); + + sub_nr_running(rq, rt_rq->rt_nr_running); + rt_rq->rt_queued = 0; +} + +static void +enqueue_top_rt_rq(struct rt_rq *rt_rq) +{ + struct rq *rq = rq_of_rt_rq(rt_rq); + + BUG_ON(&rq->rt != rt_rq); + + if (rt_rq->rt_queued) + return; + if (rt_rq_throttled(rt_rq) || !rt_rq->rt_nr_running) + return; + + add_nr_running(rq, rt_rq->rt_nr_running); + rt_rq->rt_queued = 1; +} + #if defined CONFIG_SMP static void @@ -1045,12 +1110,23 @@ void dec_rt_group(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq) {} #endif /* CONFIG_RT_GROUP_SCHED */ static inline +unsigned int rt_se_nr_running(struct sched_rt_entity *rt_se) +{ + struct rt_rq *group_rq = group_rt_rq(rt_se); + + if (group_rq) + return group_rq->rt_nr_running; + else + return 1; +} + +static inline void inc_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq) { int prio = rt_se_prio(rt_se); WARN_ON(!rt_prio(prio)); - rt_rq->rt_nr_running++; + rt_rq->rt_nr_running += rt_se_nr_running(rt_se); inc_rt_prio(rt_rq, prio); inc_rt_migration(rt_se, rt_rq); @@ -1062,7 +1138,7 @@ void dec_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq) { WARN_ON(!rt_prio(rt_se_prio(rt_se))); WARN_ON(!rt_rq->rt_nr_running); - rt_rq->rt_nr_running--; + rt_rq->rt_nr_running -= rt_se_nr_running(rt_se); dec_rt_prio(rt_rq, rt_se_prio(rt_se)); dec_rt_migration(rt_se, rt_rq); @@ -1119,6 +1195,8 @@ static void dequeue_rt_stack(struct sched_rt_entity *rt_se) back = rt_se; } + dequeue_top_rt_rq(rt_rq_of_se(back)); + for (rt_se = back; rt_se; rt_se = rt_se->back) { if (on_rt_rq(rt_se)) __dequeue_rt_entity(rt_se); @@ -1127,13 +1205,18 @@ static void dequeue_rt_stack(struct sched_rt_entity *rt_se) static void enqueue_rt_entity(struct sched_rt_entity *rt_se, bool head) { + struct rq *rq = rq_of_rt_se(rt_se); + dequeue_rt_stack(rt_se); for_each_sched_rt_entity(rt_se) __enqueue_rt_entity(rt_se, head); + enqueue_top_rt_rq(&rq->rt); } static void dequeue_rt_entity(struct sched_rt_entity *rt_se) { + struct rq *rq = rq_of_rt_se(rt_se); + dequeue_rt_stack(rt_se); for_each_sched_rt_entity(rt_se) { @@ -1142,6 +1225,7 @@ static void dequeue_rt_entity(struct sched_rt_entity *rt_se) if (rt_rq && rt_rq->rt_nr_running) __enqueue_rt_entity(rt_se, false); } + enqueue_top_rt_rq(&rq->rt); } /* @@ -1159,8 +1243,6 @@ enqueue_task_rt(struct rq *rq, struct task_struct *p, int flags) if (!task_current(rq, p) && p->nr_cpus_allowed > 1) enqueue_pushable_task(rq, p); - - inc_nr_running(rq); } static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int flags) @@ -1171,8 +1253,6 @@ static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int flags) dequeue_rt_entity(rt_se); dequeue_pushable_task(rq, p); - - dec_nr_running(rq); } /* @@ -1377,10 +1457,7 @@ pick_next_task_rt(struct rq *rq, struct task_struct *prev) if (prev->sched_class == &rt_sched_class) update_curr_rt(rq); - if (!rt_rq->rt_nr_running) - return NULL; - - if (rt_rq_throttled(rt_rq)) + if (!rt_rq->rt_queued) return NULL; put_prev_task(rq, prev); @@ -1892,9 +1969,9 @@ static void switched_to_rt(struct rq *rq, struct task_struct *p) */ if (p->on_rq && rq->curr != p) { #ifdef CONFIG_SMP - if (rq->rt.overloaded && push_rt_task(rq) && + if (p->nr_cpus_allowed > 1 && rq->rt.overloaded && /* Don't resched if we changed runqueues */ - rq != task_rq(p)) + push_rt_task(rq) && rq != task_rq(p)) check_resched = 0; #endif /* CONFIG_SMP */ if (check_resched && p->prio < rq->curr->prio) diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 369b4d663c42..e47679b04d16 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -409,6 +409,8 @@ struct rt_rq { int overloaded; struct plist_head pushable_tasks; #endif + int rt_queued; + int rt_throttled; u64 rt_time; u64 rt_runtime; @@ -423,18 +425,6 @@ struct rt_rq { #endif }; -#ifdef CONFIG_RT_GROUP_SCHED -static inline int rt_rq_throttled(struct rt_rq *rt_rq) -{ - return rt_rq->rt_throttled && !rt_rq->rt_nr_boosted; -} -#else -static inline int rt_rq_throttled(struct rt_rq *rt_rq) -{ - return rt_rq->rt_throttled; -} -#endif - /* Deadline class' related fields in a runqueue */ struct dl_rq { /* runqueue is an rbtree, ordered by deadline */ @@ -1216,12 +1206,14 @@ extern void update_idle_cpu_load(struct rq *this_rq); extern void init_task_runnable_average(struct task_struct *p); -static inline void inc_nr_running(struct rq *rq) +static inline void add_nr_running(struct rq *rq, unsigned count) { - rq->nr_running++; + unsigned prev_nr = rq->nr_running; + + rq->nr_running = prev_nr + count; #ifdef CONFIG_NO_HZ_FULL - if (rq->nr_running == 2) { + if (prev_nr < 2 && rq->nr_running >= 2) { if (tick_nohz_full_cpu(rq->cpu)) { /* Order rq->nr_running write against the IPI */ smp_wmb(); @@ -1231,9 +1223,9 @@ static inline void inc_nr_running(struct rq *rq) #endif } -static inline void dec_nr_running(struct rq *rq) +static inline void sub_nr_running(struct rq *rq, unsigned count) { - rq->nr_running--; + rq->nr_running -= count; } static inline void rq_last_tick_reset(struct rq *rq) diff --git a/kernel/sched/stop_task.c b/kernel/sched/stop_task.c index d6ce65dde541..bfe0edadbfbb 100644 --- a/kernel/sched/stop_task.c +++ b/kernel/sched/stop_task.c @@ -41,13 +41,13 @@ pick_next_task_stop(struct rq *rq, struct task_struct *prev) static void enqueue_task_stop(struct rq *rq, struct task_struct *p, int flags) { - inc_nr_running(rq); + add_nr_running(rq, 1); } static void dequeue_task_stop(struct rq *rq, struct task_struct *p, int flags) { - dec_nr_running(rq); + sub_nr_running(rq, 1); } static void yield_task_stop(struct rq *rq) diff --git a/kernel/sched/wait.c b/kernel/sched/wait.c index 7d50f794e248..0ffa20ae657b 100644 --- a/kernel/sched/wait.c +++ b/kernel/sched/wait.c @@ -394,7 +394,7 @@ EXPORT_SYMBOL(__wake_up_bit); * * In order for this to function properly, as it uses waitqueue_active() * internally, some kind of memory barrier must be done prior to calling - * this. Typically, this will be smp_mb__after_clear_bit(), but in some + * this. Typically, this will be smp_mb__after_atomic(), but in some * cases where bitflags are manipulated non-atomically under a lock, one * may need to use a less regular barrier, such fs/inode.c's smp_mb(), * because spin_unlock() does not guarantee a memory barrier. diff --git a/kernel/seccomp.c b/kernel/seccomp.c index b35c21503a36..f6d76bebe69f 100644 --- a/kernel/seccomp.c +++ b/kernel/seccomp.c @@ -39,7 +39,7 @@ * is only needed for handling filters shared across tasks. * @prev: points to a previously installed, or inherited, filter * @len: the number of instructions in the program - * @insns: the BPF program instructions to evaluate + * @insnsi: the BPF program instructions to evaluate * * seccomp_filter objects are organized in a tree linked via the @prev * pointer. For any task, it appears to be a singly-linked list starting @@ -220,7 +220,7 @@ static long seccomp_attach_filter(struct sock_fprog *fprog) return -ENOMEM; /* - * Installing a seccomp filter requires that the task have + * Installing a seccomp filter requires that the task has * CAP_SYS_ADMIN in its namespace or be running with no_new_privs. * This avoids scenarios where unprivileged tasks can affect the * behavior of privileged children. diff --git a/kernel/signal.c b/kernel/signal.c index 6ea13c09ae56..a4077e90f19f 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -277,6 +277,7 @@ void task_clear_jobctl_trapping(struct task_struct *task) { if (unlikely(task->jobctl & JOBCTL_TRAPPING)) { task->jobctl &= ~JOBCTL_TRAPPING; + smp_mb(); /* advised by wake_up_bit() */ wake_up_bit(&task->jobctl, JOBCTL_TRAPPING_BIT); } } @@ -705,11 +706,8 @@ void signal_wake_up_state(struct task_struct *t, unsigned int state) * Returns 1 if any signals were found. * * All callers must be holding the siglock. - * - * This version takes a sigset mask and looks at all signals, - * not just those in the first mask word. */ -static int rm_from_queue_full(sigset_t *mask, struct sigpending *s) +static int flush_sigqueue_mask(sigset_t *mask, struct sigpending *s) { struct sigqueue *q, *n; sigset_t m; @@ -727,29 +725,6 @@ static int rm_from_queue_full(sigset_t *mask, struct sigpending *s) } return 1; } -/* - * Remove signals in mask from the pending set and queue. - * Returns 1 if any signals were found. - * - * All callers must be holding the siglock. - */ -static int rm_from_queue(unsigned long mask, struct sigpending *s) -{ - struct sigqueue *q, *n; - - if (!sigtestsetmask(&s->signal, mask)) - return 0; - - sigdelsetmask(&s->signal, mask); - list_for_each_entry_safe(q, n, &s->list, list) { - if (q->info.si_signo < SIGRTMIN && - (mask & sigmask(q->info.si_signo))) { - list_del_init(&q->list); - __sigqueue_free(q); - } - } - return 1; -} static inline int is_si_special(const struct siginfo *info) { @@ -861,6 +836,7 @@ static bool prepare_signal(int sig, struct task_struct *p, bool force) { struct signal_struct *signal = p->signal; struct task_struct *t; + sigset_t flush; if (signal->flags & (SIGNAL_GROUP_EXIT | SIGNAL_GROUP_COREDUMP)) { if (signal->flags & SIGNAL_GROUP_COREDUMP) @@ -872,26 +848,25 @@ static bool prepare_signal(int sig, struct task_struct *p, bool force) /* * This is a stop signal. Remove SIGCONT from all queues. */ - rm_from_queue(sigmask(SIGCONT), &signal->shared_pending); - t = p; - do { - rm_from_queue(sigmask(SIGCONT), &t->pending); - } while_each_thread(p, t); + siginitset(&flush, sigmask(SIGCONT)); + flush_sigqueue_mask(&flush, &signal->shared_pending); + for_each_thread(p, t) + flush_sigqueue_mask(&flush, &t->pending); } else if (sig == SIGCONT) { unsigned int why; /* * Remove all stop signals from all queues, wake all threads. */ - rm_from_queue(SIG_KERNEL_STOP_MASK, &signal->shared_pending); - t = p; - do { + siginitset(&flush, SIG_KERNEL_STOP_MASK); + flush_sigqueue_mask(&flush, &signal->shared_pending); + for_each_thread(p, t) { + flush_sigqueue_mask(&flush, &t->pending); task_clear_jobctl_pending(t, JOBCTL_STOP_PENDING); - rm_from_queue(SIG_KERNEL_STOP_MASK, &t->pending); if (likely(!(t->ptrace & PT_SEIZED))) wake_up_state(t, __TASK_STOPPED); else ptrace_trap_notify(t); - } while_each_thread(p, t); + } /* * Notify the parent with CLD_CONTINUED if we were stopped. @@ -2854,7 +2829,7 @@ int do_sigtimedwait(const sigset_t *which, siginfo_t *info, spin_lock_irq(&tsk->sighand->siglock); __set_task_blocked(tsk, &tsk->real_blocked); - siginitset(&tsk->real_blocked, 0); + sigemptyset(&tsk->real_blocked); sig = dequeue_signal(tsk, &mask, info); } spin_unlock_irq(&tsk->sighand->siglock); @@ -3091,18 +3066,39 @@ COMPAT_SYSCALL_DEFINE4(rt_tgsigqueueinfo, } #endif +/* + * For kthreads only, must not be used if cloned with CLONE_SIGHAND + */ +void kernel_sigaction(int sig, __sighandler_t action) +{ + spin_lock_irq(¤t->sighand->siglock); + current->sighand->action[sig - 1].sa.sa_handler = action; + if (action == SIG_IGN) { + sigset_t mask; + + sigemptyset(&mask); + sigaddset(&mask, sig); + + flush_sigqueue_mask(&mask, ¤t->signal->shared_pending); + flush_sigqueue_mask(&mask, ¤t->pending); + recalc_sigpending(); + } + spin_unlock_irq(¤t->sighand->siglock); +} +EXPORT_SYMBOL(kernel_sigaction); + int do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact) { - struct task_struct *t = current; + struct task_struct *p = current, *t; struct k_sigaction *k; sigset_t mask; if (!valid_signal(sig) || sig < 1 || (act && sig_kernel_only(sig))) return -EINVAL; - k = &t->sighand->action[sig-1]; + k = &p->sighand->action[sig-1]; - spin_lock_irq(¤t->sighand->siglock); + spin_lock_irq(&p->sighand->siglock); if (oact) *oact = *k; @@ -3121,21 +3117,20 @@ int do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact) * (for example, SIGCHLD), shall cause the pending signal to * be discarded, whether or not it is blocked" */ - if (sig_handler_ignored(sig_handler(t, sig), sig)) { + if (sig_handler_ignored(sig_handler(p, sig), sig)) { sigemptyset(&mask); sigaddset(&mask, sig); - rm_from_queue_full(&mask, &t->signal->shared_pending); - do { - rm_from_queue_full(&mask, &t->pending); - } while_each_thread(current, t); + flush_sigqueue_mask(&mask, &p->signal->shared_pending); + for_each_thread(p, t) + flush_sigqueue_mask(&mask, &t->pending); } } - spin_unlock_irq(¤t->sighand->siglock); + spin_unlock_irq(&p->sighand->siglock); return 0; } -static int +static int do_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, unsigned long sp) { stack_t oss; @@ -3496,7 +3491,7 @@ COMPAT_SYSCALL_DEFINE3(sigaction, int, sig, } #endif -#ifdef __ARCH_WANT_SYS_SGETMASK +#ifdef CONFIG_SGETMASK_SYSCALL /* * For backwards compatibility. Functionality superseded by sigprocmask. @@ -3517,7 +3512,7 @@ SYSCALL_DEFINE1(ssetmask, int, newmask) return old; } -#endif /* __ARCH_WANT_SGETMASK */ +#endif /* CONFIG_SGETMASK_SYSCALL */ #ifdef __ARCH_WANT_SYS_SIGNAL /* diff --git a/kernel/smp.c b/kernel/smp.c index 06d574e42c72..306f8180b0d5 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -185,14 +185,26 @@ void generic_smp_call_function_single_interrupt(void) { struct llist_node *entry; struct call_single_data *csd, *csd_next; + static bool warned; + + entry = llist_del_all(&__get_cpu_var(call_single_queue)); + entry = llist_reverse_order(entry); /* * Shouldn't receive this interrupt on a cpu that is not yet online. */ - WARN_ON_ONCE(!cpu_online(smp_processor_id())); + if (unlikely(!cpu_online(smp_processor_id()) && !warned)) { + warned = true; + WARN(1, "IPI on offline CPU %d\n", smp_processor_id()); - entry = llist_del_all(&__get_cpu_var(call_single_queue)); - entry = llist_reverse_order(entry); + /* + * We don't have to use the _safe() variant here + * because we are not invoking the IPI handlers yet. + */ + llist_for_each_entry(csd, entry, llist) + pr_warn("IPI callback %pS sent to offline CPU\n", + csd->func); + } llist_for_each_entry_safe(csd, csd_next, entry, llist) { csd->func(csd->info); diff --git a/kernel/softirq.c b/kernel/softirq.c index 92f24f5e8d52..5918d227730f 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -232,7 +232,6 @@ asmlinkage __visible void __do_softirq(void) bool in_hardirq; __u32 pending; int softirq_bit; - int cpu; /* * Mask out PF_MEMALLOC s current task context is borrowed for the @@ -247,7 +246,6 @@ asmlinkage __visible void __do_softirq(void) __local_bh_disable_ip(_RET_IP_, SOFTIRQ_OFFSET); in_hardirq = lockdep_softirq_start(); - cpu = smp_processor_id(); restart: /* Reset the pending bitmask before enabling irqs */ set_softirq_pending(0); @@ -276,11 +274,11 @@ restart: prev_count, preempt_count()); preempt_count_set(prev_count); } - rcu_bh_qs(cpu); h++; pending >>= softirq_bit; } + rcu_bh_qs(smp_processor_id()); local_irq_disable(); pending = local_softirq_pending(); diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c index 01fbae5b97b7..695f0c6cd169 100644 --- a/kernel/stop_machine.c +++ b/kernel/stop_machine.c @@ -307,6 +307,7 @@ int stop_two_cpus(unsigned int cpu1, unsigned int cpu2, cpu_stop_fn_t fn, void * * @cpu: cpu to stop * @fn: function to execute * @arg: argument to @fn + * @work_buf: pointer to cpu_stop_work structure * * Similar to stop_one_cpu() but doesn't wait for completion. The * caller is responsible for ensuring @work_buf is currently unused diff --git a/kernel/sys.c b/kernel/sys.c index fba0f29401ea..66a751ebf9d9 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -250,7 +250,7 @@ SYSCALL_DEFINE2(getpriority, int, which, int, who) else p = current; if (p) { - niceval = 20 - task_nice(p); + niceval = nice_to_rlimit(task_nice(p)); if (niceval > retval) retval = niceval; } @@ -261,7 +261,7 @@ SYSCALL_DEFINE2(getpriority, int, which, int, who) else pgrp = task_pgrp(current); do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { - niceval = 20 - task_nice(p); + niceval = nice_to_rlimit(task_nice(p)); if (niceval > retval) retval = niceval; } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); @@ -277,7 +277,7 @@ SYSCALL_DEFINE2(getpriority, int, which, int, who) do_each_thread(g, p) { if (uid_eq(task_uid(p), uid)) { - niceval = 20 - task_nice(p); + niceval = nice_to_rlimit(task_nice(p)); if (niceval > retval) retval = niceval; } diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c index bc8d1b74a6b9..36441b51b5df 100644 --- a/kernel/sys_ni.c +++ b/kernel/sys_ni.c @@ -135,6 +135,8 @@ cond_syscall(sys_setresgid16); cond_syscall(sys_setresuid16); cond_syscall(sys_setreuid16); cond_syscall(sys_setuid16); +cond_syscall(sys_sgetmask); +cond_syscall(sys_ssetmask); cond_syscall(sys_vm86old); cond_syscall(sys_vm86); cond_syscall(sys_ipc); diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 74f5b580fe34..db19e3e2aa4b 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -173,6 +173,13 @@ extern int no_unaligned_warning; #endif #ifdef CONFIG_PROC_SYSCTL + +#define SYSCTL_WRITES_LEGACY -1 +#define SYSCTL_WRITES_WARN 0 +#define SYSCTL_WRITES_STRICT 1 + +static int sysctl_writes_strict = SYSCTL_WRITES_WARN; + static int proc_do_cad_pid(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos); static int proc_taint(struct ctl_table *table, int write, @@ -195,7 +202,7 @@ static int proc_dostring_coredump(struct ctl_table *table, int write, /* Note: sysrq code uses it's own private copy */ static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; -static int sysrq_sysctl_handler(ctl_table *table, int write, +static int sysrq_sysctl_handler(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { @@ -495,6 +502,15 @@ static struct ctl_table kern_table[] = { .mode = 0644, .proc_handler = proc_taint, }, + { + .procname = "sysctl_writes_strict", + .data = &sysctl_writes_strict, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &neg_one, + .extra2 = &one, + }, #endif #ifdef CONFIG_LATENCYTOP { @@ -643,7 +659,7 @@ static struct ctl_table kern_table[] = { .extra2 = &one, }, #endif - +#ifdef CONFIG_UEVENT_HELPER { .procname = "hotplug", .data = &uevent_helper, @@ -651,7 +667,7 @@ static struct ctl_table kern_table[] = { .mode = 0644, .proc_handler = proc_dostring, }, - +#endif #ifdef CONFIG_CHR_DEV_SG { .procname = "sg-big-buff", @@ -1418,8 +1434,13 @@ static struct ctl_table vm_table[] = { (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) { .procname = "vdso_enabled", +#ifdef CONFIG_X86_32 + .data = &vdso32_enabled, + .maxlen = sizeof(vdso32_enabled), +#else .data = &vdso_enabled, .maxlen = sizeof(vdso_enabled), +#endif .mode = 0644, .proc_handler = proc_dointvec, .extra1 = &zero, @@ -1698,8 +1719,8 @@ int __init sysctl_init(void) #ifdef CONFIG_PROC_SYSCTL -static int _proc_do_string(void* data, int maxlen, int write, - void __user *buffer, +static int _proc_do_string(char *data, int maxlen, int write, + char __user *buffer, size_t *lenp, loff_t *ppos) { size_t len; @@ -1712,21 +1733,30 @@ static int _proc_do_string(void* data, int maxlen, int write, } if (write) { - len = 0; + if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { + /* Only continue writes not past the end of buffer. */ + len = strlen(data); + if (len > maxlen - 1) + len = maxlen - 1; + + if (*ppos > len) + return 0; + len = *ppos; + } else { + /* Start writing from beginning of buffer. */ + len = 0; + } + + *ppos += *lenp; p = buffer; - while (len < *lenp) { + while ((p - buffer) < *lenp && len < maxlen - 1) { if (get_user(c, p++)) return -EFAULT; if (c == 0 || c == '\n') break; - len++; + data[len++] = c; } - if (len >= maxlen) - len = maxlen-1; - if(copy_from_user(data, buffer, len)) - return -EFAULT; - ((char *) data)[len] = 0; - *ppos += *lenp; + data[len] = 0; } else { len = strlen(data); if (len > maxlen) @@ -1743,10 +1773,10 @@ static int _proc_do_string(void* data, int maxlen, int write, if (len > *lenp) len = *lenp; if (len) - if(copy_to_user(buffer, data, len)) + if (copy_to_user(buffer, data, len)) return -EFAULT; if (len < *lenp) { - if(put_user('\n', ((char __user *) buffer) + len)) + if (put_user('\n', buffer + len)) return -EFAULT; len++; } @@ -1756,6 +1786,14 @@ static int _proc_do_string(void* data, int maxlen, int write, return 0; } +static void warn_sysctl_write(struct ctl_table *table) +{ + pr_warn_once("%s wrote to %s when file position was not 0!\n" + "This will not be supported in the future. To silence this\n" + "warning, set kernel.sysctl_writes_strict = -1\n", + current->comm, table->procname); +} + /** * proc_dostring - read a string sysctl * @table: the sysctl table @@ -1776,8 +1814,11 @@ static int _proc_do_string(void* data, int maxlen, int write, int proc_dostring(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { - return _proc_do_string(table->data, table->maxlen, write, - buffer, lenp, ppos); + if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN) + warn_sysctl_write(table); + + return _proc_do_string((char *)(table->data), table->maxlen, write, + (char __user *)buffer, lenp, ppos); } static size_t proc_skip_spaces(char **buf) @@ -1951,6 +1992,18 @@ static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, conv = do_proc_dointvec_conv; if (write) { + if (*ppos) { + switch (sysctl_writes_strict) { + case SYSCTL_WRITES_STRICT: + goto out; + case SYSCTL_WRITES_WARN: + warn_sysctl_write(table); + break; + default: + break; + } + } + if (left > PAGE_SIZE - 1) left = PAGE_SIZE - 1; page = __get_free_page(GFP_TEMPORARY); @@ -2008,6 +2061,7 @@ free: return err ? : -EINVAL; } *lenp -= left; +out: *ppos += *lenp; return err; } @@ -2200,6 +2254,18 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int left = *lenp; if (write) { + if (*ppos) { + switch (sysctl_writes_strict) { + case SYSCTL_WRITES_STRICT: + goto out; + case SYSCTL_WRITES_WARN: + warn_sysctl_write(table); + break; + default: + break; + } + } + if (left > PAGE_SIZE - 1) left = PAGE_SIZE - 1; page = __get_free_page(GFP_TEMPORARY); @@ -2255,6 +2321,7 @@ free: return err ? : -EINVAL; } *lenp -= left; +out: *ppos += *lenp; return err; } diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index 419a52cecd20..33db43a39515 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -165,21 +165,21 @@ static inline void pps_set_freq(s64 freq) static inline int is_error_status(int status) { - return (time_status & (STA_UNSYNC|STA_CLOCKERR)) + return (status & (STA_UNSYNC|STA_CLOCKERR)) /* PPS signal lost when either PPS time or * PPS frequency synchronization requested */ - || ((time_status & (STA_PPSFREQ|STA_PPSTIME)) - && !(time_status & STA_PPSSIGNAL)) + || ((status & (STA_PPSFREQ|STA_PPSTIME)) + && !(status & STA_PPSSIGNAL)) /* PPS jitter exceeded when * PPS time synchronization requested */ - || ((time_status & (STA_PPSTIME|STA_PPSJITTER)) + || ((status & (STA_PPSTIME|STA_PPSJITTER)) == (STA_PPSTIME|STA_PPSJITTER)) /* PPS wander exceeded or calibration error when * PPS frequency synchronization requested */ - || ((time_status & STA_PPSFREQ) - && (time_status & (STA_PPSWANDER|STA_PPSERROR))); + || ((status & STA_PPSFREQ) + && (status & (STA_PPSWANDER|STA_PPSERROR))); } static inline void pps_fill_timex(struct timex *txc) @@ -786,8 +786,9 @@ static long hardpps_update_freq(struct pps_normtime freq_norm) time_status |= STA_PPSERROR; pps_errcnt++; pps_dec_freq_interval(); - pr_err("hardpps: PPSERROR: interval too long - %ld s\n", - freq_norm.sec); + printk_deferred(KERN_ERR + "hardpps: PPSERROR: interval too long - %ld s\n", + freq_norm.sec); return 0; } @@ -800,7 +801,8 @@ static long hardpps_update_freq(struct pps_normtime freq_norm) delta = shift_right(ftemp - pps_freq, NTP_SCALE_SHIFT); pps_freq = ftemp; if (delta > PPS_MAXWANDER || delta < -PPS_MAXWANDER) { - pr_warning("hardpps: PPSWANDER: change=%ld\n", delta); + printk_deferred(KERN_WARNING + "hardpps: PPSWANDER: change=%ld\n", delta); time_status |= STA_PPSWANDER; pps_stbcnt++; pps_dec_freq_interval(); @@ -844,8 +846,9 @@ static void hardpps_update_phase(long error) * the time offset is updated. */ if (jitter > (pps_jitter << PPS_POPCORN)) { - pr_warning("hardpps: PPSJITTER: jitter=%ld, limit=%ld\n", - jitter, (pps_jitter << PPS_POPCORN)); + printk_deferred(KERN_WARNING + "hardpps: PPSJITTER: jitter=%ld, limit=%ld\n", + jitter, (pps_jitter << PPS_POPCORN)); time_status |= STA_PPSJITTER; pps_jitcnt++; } else if (time_status & STA_PPSTIME) { @@ -902,7 +905,7 @@ void __hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts) time_status |= STA_PPSJITTER; /* restart the frequency calibration interval */ pps_fbase = *raw_ts; - pr_err("hardpps: PPSJITTER: bad pulse\n"); + printk_deferred(KERN_ERR "hardpps: PPSJITTER: bad pulse\n"); return; } @@ -923,7 +926,10 @@ void __hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts) static int __init ntp_tick_adj_setup(char *str) { - ntp_tick_adj = simple_strtol(str, NULL, 0); + int rc = kstrtol(str, 0, (long *)&ntp_tick_adj); + + if (rc) + return rc; ntp_tick_adj <<= NTP_SCALE_SHIFT; return 1; diff --git a/kernel/time/sched_clock.c b/kernel/time/sched_clock.c index 4d23dc4d8139..445106d2c729 100644 --- a/kernel/time/sched_clock.c +++ b/kernel/time/sched_clock.c @@ -49,13 +49,6 @@ static u64 notrace jiffy_sched_clock_read(void) return (u64)(jiffies - INITIAL_JIFFIES); } -static u32 __read_mostly (*read_sched_clock_32)(void); - -static u64 notrace read_sched_clock_32_wrapper(void) -{ - return read_sched_clock_32(); -} - static u64 __read_mostly (*read_sched_clock)(void) = jiffy_sched_clock_read; static inline u64 notrace cyc_to_ns(u64 cyc, u32 mult, u32 shift) @@ -176,12 +169,6 @@ void __init sched_clock_register(u64 (*read)(void), int bits, pr_debug("Registered %pF as sched_clock source\n", read); } -void __init setup_sched_clock(u32 (*read)(void), int bits, unsigned long rate) -{ - read_sched_clock_32 = read; - sched_clock_register(read_sched_clock_32_wrapper, bits, rate); -} - void __init sched_clock_postinit(void) { /* diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index f7df8ea21707..32d8d6aaedb8 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -852,8 +852,9 @@ static void __timekeeping_inject_sleeptime(struct timekeeper *tk, struct timespec *delta) { if (!timespec_valid_strict(delta)) { - printk(KERN_WARNING "__timekeeping_inject_sleeptime: Invalid " - "sleep delta value!\n"); + printk_deferred(KERN_WARNING + "__timekeeping_inject_sleeptime: Invalid " + "sleep delta value!\n"); return; } tk_xtime_add(tk, delta); @@ -1157,7 +1158,7 @@ static void timekeeping_adjust(struct timekeeper *tk, s64 offset) if (unlikely(tk->clock->maxadj && (tk->mult + adj > tk->clock->mult + tk->clock->maxadj))) { - printk_once(KERN_WARNING + printk_deferred_once(KERN_WARNING "Adjusting %s more than 11%% (%ld vs %ld)\n", tk->clock->name, (long)tk->mult + adj, (long)tk->clock->mult + tk->clock->maxadj); diff --git a/kernel/torture.c b/kernel/torture.c index acc9afc2f26e..40bb511cca48 100644 --- a/kernel/torture.c +++ b/kernel/torture.c @@ -335,13 +335,8 @@ static void torture_shuffle_tasks(void) shuffle_idle_cpu = cpumask_next(shuffle_idle_cpu, shuffle_tmp_mask); if (shuffle_idle_cpu >= nr_cpu_ids) shuffle_idle_cpu = -1; - if (shuffle_idle_cpu != -1) { + else cpumask_clear_cpu(shuffle_idle_cpu, shuffle_tmp_mask); - if (cpumask_empty(shuffle_tmp_mask)) { - put_online_cpus(); - return; - } - } mutex_lock(&shuffle_task_mutex); list_for_each_entry(stp, &shuffle_task_list, st_l) @@ -533,7 +528,11 @@ void stutter_wait(const char *title) while (ACCESS_ONCE(stutter_pause_test) || (torture_runnable && !ACCESS_ONCE(*torture_runnable))) { if (stutter_pause_test) - schedule_timeout_interruptible(1); + if (ACCESS_ONCE(stutter_pause_test) == 1) + schedule_timeout_interruptible(1); + else + while (ACCESS_ONCE(stutter_pause_test)) + cond_resched(); else schedule_timeout_interruptible(round_jiffies_relative(HZ)); torture_shutdown_absorb(title); @@ -550,7 +549,11 @@ static int torture_stutter(void *arg) VERBOSE_TOROUT_STRING("torture_stutter task started"); do { if (!torture_must_stop()) { - schedule_timeout_interruptible(stutter); + if (stutter > 1) { + schedule_timeout_interruptible(stutter - 1); + ACCESS_ONCE(stutter_pause_test) = 2; + } + schedule_timeout_interruptible(1); ACCESS_ONCE(stutter_pause_test) = 1; } if (!torture_must_stop()) @@ -596,21 +599,27 @@ static void torture_stutter_cleanup(void) * The runnable parameter points to a flag that controls whether or not * the test is currently runnable. If there is no such flag, pass in NULL. */ -void __init torture_init_begin(char *ttype, bool v, int *runnable) +bool torture_init_begin(char *ttype, bool v, int *runnable) { mutex_lock(&fullstop_mutex); + if (torture_type != NULL) { + pr_alert("torture_init_begin: refusing %s init: %s running", + ttype, torture_type); + mutex_unlock(&fullstop_mutex); + return false; + } torture_type = ttype; verbose = v; torture_runnable = runnable; fullstop = FULLSTOP_DONTSTOP; - + return true; } EXPORT_SYMBOL_GPL(torture_init_begin); /* * Tell the torture module that initialization is complete. */ -void __init torture_init_end(void) +void torture_init_end(void) { mutex_unlock(&fullstop_mutex); register_reboot_notifier(&torture_shutdown_nb); @@ -642,6 +651,9 @@ bool torture_cleanup(void) torture_shuffle_cleanup(); torture_stutter_cleanup(); torture_onoff_cleanup(); + mutex_lock(&fullstop_mutex); + torture_type = NULL; + mutex_unlock(&fullstop_mutex); return false; } EXPORT_SYMBOL_GPL(torture_cleanup); @@ -674,8 +686,10 @@ EXPORT_SYMBOL_GPL(torture_must_stop_irq); */ void torture_kthread_stopping(char *title) { - if (verbose) - VERBOSE_TOROUT_STRING(title); + char buf[128]; + + snprintf(buf, sizeof(buf), "Stopping %s", title); + VERBOSE_TOROUT_STRING(buf); while (!kthread_should_stop()) { torture_shutdown_absorb(title); schedule_timeout_uninterruptible(1); diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c index 6620e5837ce2..33cbd8c203f8 100644 --- a/kernel/tracepoint.c +++ b/kernel/tracepoint.c @@ -239,6 +239,7 @@ static int tracepoint_remove_func(struct tracepoint *tp, * tracepoint_probe_register - Connect a probe to a tracepoint * @tp: tracepoint * @probe: probe handler + * @data: tracepoint data * * Returns 0 if ok, error value on error. * Note: if @tp is within a module, the caller is responsible for @@ -264,6 +265,7 @@ EXPORT_SYMBOL_GPL(tracepoint_probe_register); * tracepoint_probe_unregister - Disconnect a probe from a tracepoint * @tp: tracepoint * @probe: probe function pointer + * @data: tracepoint data * * Returns 0 if ok, error value on error. */ diff --git a/kernel/user.c b/kernel/user.c index 294fc6a94168..4efa39350e44 100644 --- a/kernel/user.c +++ b/kernel/user.c @@ -87,7 +87,6 @@ static DEFINE_SPINLOCK(uidhash_lock); struct user_struct root_user = { .__count = ATOMIC_INIT(1), .processes = ATOMIC_INIT(1), - .files = ATOMIC_INIT(0), .sigpending = ATOMIC_INIT(0), .locked_shm = 0, .uid = GLOBAL_ROOT_UID, diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c index bf71b4b2d632..fcc02560fd6b 100644 --- a/kernel/user_namespace.c +++ b/kernel/user_namespace.c @@ -286,7 +286,7 @@ EXPORT_SYMBOL(from_kuid_munged); /** * make_kgid - Map a user-namespace gid pair into a kgid. * @ns: User namespace that the gid is in - * @uid: group identifier + * @gid: group identifier * * Maps a user-namespace gid pair into a kernel internal kgid, * and returns that kgid. @@ -482,7 +482,8 @@ static int projid_m_show(struct seq_file *seq, void *v) return 0; } -static void *m_start(struct seq_file *seq, loff_t *ppos, struct uid_gid_map *map) +static void *m_start(struct seq_file *seq, loff_t *ppos, + struct uid_gid_map *map) { struct uid_gid_extent *extent = NULL; loff_t pos = *ppos; @@ -546,7 +547,8 @@ struct seq_operations proc_projid_seq_operations = { .show = projid_m_show, }; -static bool mappings_overlap(struct uid_gid_map *new_map, struct uid_gid_extent *extent) +static bool mappings_overlap(struct uid_gid_map *new_map, + struct uid_gid_extent *extent) { u32 upper_first, lower_first, upper_last, lower_last; unsigned idx; @@ -653,7 +655,7 @@ static ssize_t map_write(struct file *file, const char __user *buf, ret = -EINVAL; pos = kbuf; new_map.nr_extents = 0; - for (;pos; pos = next_line) { + for (; pos; pos = next_line) { extent = &new_map.extent[new_map.nr_extents]; /* Find the end of line and ensure I don't look past it */ @@ -687,13 +689,16 @@ static ssize_t map_write(struct file *file, const char __user *buf, /* Verify we have been given valid starting values */ if ((extent->first == (u32) -1) || - (extent->lower_first == (u32) -1 )) + (extent->lower_first == (u32) -1)) goto out; - /* Verify count is not zero and does not cause the extent to wrap */ + /* Verify count is not zero and does not cause the + * extent to wrap + */ if ((extent->first + extent->count) <= extent->first) goto out; - if ((extent->lower_first + extent->count) <= extent->lower_first) + if ((extent->lower_first + extent->count) <= + extent->lower_first) goto out; /* Do the ranges in extent overlap any previous extents? */ @@ -751,7 +756,8 @@ out: return ret; } -ssize_t proc_uid_map_write(struct file *file, const char __user *buf, size_t size, loff_t *ppos) +ssize_t proc_uid_map_write(struct file *file, const char __user *buf, + size_t size, loff_t *ppos) { struct seq_file *seq = file->private_data; struct user_namespace *ns = seq->private; @@ -767,7 +773,8 @@ ssize_t proc_uid_map_write(struct file *file, const char __user *buf, size_t siz &ns->uid_map, &ns->parent->uid_map); } -ssize_t proc_gid_map_write(struct file *file, const char __user *buf, size_t size, loff_t *ppos) +ssize_t proc_gid_map_write(struct file *file, const char __user *buf, + size_t size, loff_t *ppos) { struct seq_file *seq = file->private_data; struct user_namespace *ns = seq->private; @@ -783,7 +790,8 @@ ssize_t proc_gid_map_write(struct file *file, const char __user *buf, size_t siz &ns->gid_map, &ns->parent->gid_map); } -ssize_t proc_projid_map_write(struct file *file, const char __user *buf, size_t size, loff_t *ppos) +ssize_t proc_projid_map_write(struct file *file, const char __user *buf, + size_t size, loff_t *ppos) { struct seq_file *seq = file->private_data; struct user_namespace *ns = seq->private; @@ -800,7 +808,7 @@ ssize_t proc_projid_map_write(struct file *file, const char __user *buf, size_t &ns->projid_map, &ns->parent->projid_map); } -static bool new_idmap_permitted(const struct file *file, +static bool new_idmap_permitted(const struct file *file, struct user_namespace *ns, int cap_setid, struct uid_gid_map *new_map) { @@ -811,8 +819,7 @@ static bool new_idmap_permitted(const struct file *file, kuid_t uid = make_kuid(ns->parent, id); if (uid_eq(uid, file->f_cred->fsuid)) return true; - } - else if (cap_setid == CAP_SETGID) { + } else if (cap_setid == CAP_SETGID) { kgid_t gid = make_kgid(ns->parent, id); if (gid_eq(gid, file->f_cred->fsgid)) return true; diff --git a/kernel/utsname_sysctl.c b/kernel/utsname_sysctl.c index 4f69f9a5e221..c8eac43267e9 100644 --- a/kernel/utsname_sysctl.c +++ b/kernel/utsname_sysctl.c @@ -17,7 +17,7 @@ #ifdef CONFIG_PROC_SYSCTL -static void *get_uts(ctl_table *table, int write) +static void *get_uts(struct ctl_table *table, int write) { char *which = table->data; struct uts_namespace *uts_ns; @@ -32,7 +32,7 @@ static void *get_uts(ctl_table *table, int write) return which; } -static void put_uts(ctl_table *table, int write, void *which) +static void put_uts(struct ctl_table *table, int write, void *which) { if (!write) up_read(&uts_sem); @@ -44,14 +44,14 @@ static void put_uts(ctl_table *table, int write, void *which) * Special case of dostring for the UTS structure. This has locks * to observe. Should this be in kernel/sys.c ???? */ -static int proc_do_uts_string(ctl_table *table, int write, +static int proc_do_uts_string(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { struct ctl_table uts_table; int r; memcpy(&uts_table, table, sizeof(uts_table)); uts_table.data = get_uts(table, write); - r = proc_dostring(&uts_table,write,buffer,lenp, ppos); + r = proc_dostring(&uts_table, write, buffer, lenp, ppos); put_uts(table, write, uts_table.data); if (write) @@ -135,4 +135,4 @@ static int __init utsname_sysctl_init(void) return 0; } -__initcall(utsname_sysctl_init); +device_initcall(utsname_sysctl_init); diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 8edc87185427..a4bab46cd38e 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -100,10 +100,10 @@ enum { /* * Rescue workers are used only on emergencies and shared by - * all cpus. Give -20. + * all cpus. Give MIN_NICE. */ - RESCUER_NICE_LEVEL = -20, - HIGHPRI_NICE_LEVEL = -20, + RESCUER_NICE_LEVEL = MIN_NICE, + HIGHPRI_NICE_LEVEL = MIN_NICE, WQ_NAME_LEN = 24, }; |