diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/audit.c | 11 | ||||
| -rw-r--r-- | kernel/audit_tree.c | 5 | ||||
| -rw-r--r-- | kernel/fork.c | 130 | ||||
| -rw-r--r-- | kernel/kgdb.c | 8 | ||||
| -rw-r--r-- | kernel/module.c | 25 | ||||
| -rw-r--r-- | kernel/sched.c | 31 | ||||
| -rw-r--r-- | kernel/semaphore.c | 64 | ||||
| -rw-r--r-- | kernel/sysctl.c | 5 |
8 files changed, 68 insertions, 211 deletions
diff --git a/kernel/audit.c b/kernel/audit.c index b7d3709cc452..e8692a5748c2 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -572,16 +572,17 @@ void audit_send_reply(int pid, int seq, int type, int done, int multi, skb = audit_make_reply(pid, seq, type, done, multi, payload, size); if (!skb) - return; + goto out; reply->pid = pid; reply->skb = skb; tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply"); - if (IS_ERR(tsk)) { - kfree(reply); - kfree_skb(skb); - } + if (!IS_ERR(tsk)) + return; + kfree_skb(skb); +out: + kfree(reply); } /* diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c index 9ef5e0aacc3c..f7921a2ecf16 100644 --- a/kernel/audit_tree.c +++ b/kernel/audit_tree.c @@ -172,10 +172,9 @@ static void insert_hash(struct audit_chunk *chunk) struct audit_chunk *audit_tree_lookup(const struct inode *inode) { struct list_head *list = chunk_hash(inode); - struct list_head *pos; + struct audit_chunk *p; - list_for_each_rcu(pos, list) { - struct audit_chunk *p = container_of(pos, struct audit_chunk, hash); + list_for_each_entry_rcu(p, list, hash) { if (p->watch.inode == inode) { get_inotify_watch(&p->watch); return p; diff --git a/kernel/fork.c b/kernel/fork.c index 933e60ebccae..19908b26cf80 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -660,136 +660,6 @@ static int copy_fs(unsigned long clone_flags, struct task_struct *tsk) return 0; } -static int count_open_files(struct fdtable *fdt) -{ - int size = fdt->max_fds; - int i; - - /* Find the last open fd */ - for (i = size/(8*sizeof(long)); i > 0; ) { - if (fdt->open_fds->fds_bits[--i]) - break; - } - i = (i+1) * 8 * sizeof(long); - return i; -} - -static struct files_struct *alloc_files(void) -{ - struct files_struct *newf; - struct fdtable *fdt; - - newf = kmem_cache_alloc(files_cachep, GFP_KERNEL); - if (!newf) - goto out; - - atomic_set(&newf->count, 1); - - spin_lock_init(&newf->file_lock); - newf->next_fd = 0; - fdt = &newf->fdtab; - fdt->max_fds = NR_OPEN_DEFAULT; - fdt->close_on_exec = (fd_set *)&newf->close_on_exec_init; - fdt->open_fds = (fd_set *)&newf->open_fds_init; - fdt->fd = &newf->fd_array[0]; - INIT_RCU_HEAD(&fdt->rcu); - fdt->next = NULL; - rcu_assign_pointer(newf->fdt, fdt); -out: - return newf; -} - -/* - * Allocate a new files structure and copy contents from the - * passed in files structure. - * errorp will be valid only when the returned files_struct is NULL. - */ -static struct files_struct *dup_fd(struct files_struct *oldf, int *errorp) -{ - struct files_struct *newf; - struct file **old_fds, **new_fds; - int open_files, size, i; - struct fdtable *old_fdt, *new_fdt; - - *errorp = -ENOMEM; - newf = alloc_files(); - if (!newf) - goto out; - - spin_lock(&oldf->file_lock); - old_fdt = files_fdtable(oldf); - new_fdt = files_fdtable(newf); - open_files = count_open_files(old_fdt); - - /* - * Check whether we need to allocate a larger fd array and fd set. - * Note: we're not a clone task, so the open count won't change. - */ - if (open_files > new_fdt->max_fds) { - new_fdt->max_fds = 0; - spin_unlock(&oldf->file_lock); - spin_lock(&newf->file_lock); - *errorp = expand_files(newf, open_files-1); - spin_unlock(&newf->file_lock); - if (*errorp < 0) - goto out_release; - new_fdt = files_fdtable(newf); - /* - * Reacquire the oldf lock and a pointer to its fd table - * who knows it may have a new bigger fd table. We need - * the latest pointer. - */ - spin_lock(&oldf->file_lock); - old_fdt = files_fdtable(oldf); - } - - old_fds = old_fdt->fd; - new_fds = new_fdt->fd; - - memcpy(new_fdt->open_fds->fds_bits, - old_fdt->open_fds->fds_bits, open_files/8); - memcpy(new_fdt->close_on_exec->fds_bits, - old_fdt->close_on_exec->fds_bits, open_files/8); - - for (i = open_files; i != 0; i--) { - struct file *f = *old_fds++; - if (f) { - get_file(f); - } else { - /* - * The fd may be claimed in the fd bitmap but not yet - * instantiated in the files array if a sibling thread - * is partway through open(). So make sure that this - * fd is available to the new process. - */ - FD_CLR(open_files - i, new_fdt->open_fds); - } - rcu_assign_pointer(*new_fds++, f); - } - spin_unlock(&oldf->file_lock); - - /* compute the remainder to be cleared */ - size = (new_fdt->max_fds - open_files) * sizeof(struct file *); - - /* This is long word aligned thus could use a optimized version */ - memset(new_fds, 0, size); - - if (new_fdt->max_fds > open_files) { - int left = (new_fdt->max_fds-open_files)/8; - int start = open_files / (8 * sizeof(unsigned long)); - - memset(&new_fdt->open_fds->fds_bits[start], 0, left); - memset(&new_fdt->close_on_exec->fds_bits[start], 0, left); - } - - return newf; - -out_release: - kmem_cache_free(files_cachep, newf); -out: - return NULL; -} - static int copy_files(unsigned long clone_flags, struct task_struct * tsk) { struct files_struct *oldf, *newf; diff --git a/kernel/kgdb.c b/kernel/kgdb.c index 39e31a036f5b..14787de568b3 100644 --- a/kernel/kgdb.c +++ b/kernel/kgdb.c @@ -346,14 +346,6 @@ static void put_packet(char *buffer) } } -static char *pack_hex_byte(char *pkt, u8 byte) -{ - *pkt++ = hexchars[byte >> 4]; - *pkt++ = hexchars[byte & 0xf]; - - return pkt; -} - /* * Convert the memory pointed to by mem into hex, placing result in buf. * Return a pointer to the last char put in buf (null). May return an error. diff --git a/kernel/module.c b/kernel/module.c index 8e4528c9909f..f5e9491ef7ac 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -917,6 +917,10 @@ static int check_version(Elf_Shdr *sechdrs, if (!crc) return 1; + /* No versions at all? modprobe --force does this. */ + if (versindex == 0) + return try_to_force_load(mod, symname) == 0; + versions = (void *) sechdrs[versindex].sh_addr; num_versions = sechdrs[versindex].sh_size / sizeof(struct modversion_info); @@ -932,8 +936,9 @@ static int check_version(Elf_Shdr *sechdrs, goto bad_version; } - if (!try_to_force_load(mod, symname)) - return 1; + printk(KERN_WARNING "%s: no symbol version for %s\n", + mod->name, symname); + return 0; bad_version: printk("%s: disagrees about version of symbol %s\n", @@ -952,11 +957,14 @@ static inline int check_modstruct_version(Elf_Shdr *sechdrs, return check_version(sechdrs, versindex, "struct_module", mod, crc); } -/* First part is kernel version, which we ignore. */ -static inline int same_magic(const char *amagic, const char *bmagic) +/* First part is kernel version, which we ignore if module has crcs. */ +static inline int same_magic(const char *amagic, const char *bmagic, + bool has_crcs) { - amagic += strcspn(amagic, " "); - bmagic += strcspn(bmagic, " "); + if (has_crcs) { + amagic += strcspn(amagic, " "); + bmagic += strcspn(bmagic, " "); + } return strcmp(amagic, bmagic) == 0; } #else @@ -976,7 +984,8 @@ static inline int check_modstruct_version(Elf_Shdr *sechdrs, return 1; } -static inline int same_magic(const char *amagic, const char *bmagic) +static inline int same_magic(const char *amagic, const char *bmagic, + bool has_crcs) { return strcmp(amagic, bmagic) == 0; } @@ -1869,7 +1878,7 @@ static struct module *load_module(void __user *umod, err = try_to_force_load(mod, "magic"); if (err) goto free_hdr; - } else if (!same_magic(modmagic, vermagic)) { + } else if (!same_magic(modmagic, vermagic, versindex)) { printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", mod->name, modmagic, vermagic); err = -ENOEXEC; diff --git a/kernel/sched.c b/kernel/sched.c index 58fb8af15776..cfa222a91539 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -4567,8 +4567,6 @@ EXPORT_SYMBOL(schedule); asmlinkage void __sched preempt_schedule(void) { struct thread_info *ti = current_thread_info(); - struct task_struct *task = current; - int saved_lock_depth; /* * If there is a non-zero preempt_count or interrupts are disabled, @@ -4579,16 +4577,7 @@ asmlinkage void __sched preempt_schedule(void) do { add_preempt_count(PREEMPT_ACTIVE); - - /* - * We keep the big kernel semaphore locked, but we - * clear ->lock_depth so that schedule() doesnt - * auto-release the semaphore: - */ - saved_lock_depth = task->lock_depth; - task->lock_depth = -1; schedule(); - task->lock_depth = saved_lock_depth; sub_preempt_count(PREEMPT_ACTIVE); /* @@ -4609,26 +4598,15 @@ EXPORT_SYMBOL(preempt_schedule); asmlinkage void __sched preempt_schedule_irq(void) { struct thread_info *ti = current_thread_info(); - struct task_struct *task = current; - int saved_lock_depth; /* Catch callers which need to be fixed */ BUG_ON(ti->preempt_count || !irqs_disabled()); do { add_preempt_count(PREEMPT_ACTIVE); - - /* - * We keep the big kernel semaphore locked, but we - * clear ->lock_depth so that schedule() doesnt - * auto-release the semaphore: - */ - saved_lock_depth = task->lock_depth; - task->lock_depth = -1; local_irq_enable(); schedule(); local_irq_disable(); - task->lock_depth = saved_lock_depth; sub_preempt_count(PREEMPT_ACTIVE); /* @@ -5547,7 +5525,6 @@ static void __cond_resched(void) } while (need_resched()); } -#if !defined(CONFIG_PREEMPT) || defined(CONFIG_PREEMPT_VOLUNTARY) int __sched _cond_resched(void) { if (need_resched() && !(preempt_count() & PREEMPT_ACTIVE) && @@ -5558,7 +5535,6 @@ int __sched _cond_resched(void) return 0; } EXPORT_SYMBOL(_cond_resched); -#endif /* * cond_resched_lock() - if a reschedule is pending, drop the given lock, @@ -5853,8 +5829,11 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu) spin_unlock_irqrestore(&rq->lock, flags); /* Set the preempt count _outside_ the spinlocks! */ +#if defined(CONFIG_PREEMPT) + task_thread_info(idle)->preempt_count = (idle->lock_depth >= 0); +#else task_thread_info(idle)->preempt_count = 0; - +#endif /* * The idle tasks have their own, simple scheduling class: */ @@ -9007,7 +8986,7 @@ static u64 cpu_shares_read_u64(struct cgroup *cgrp, struct cftype *cft) #endif #ifdef CONFIG_RT_GROUP_SCHED -static ssize_t cpu_rt_runtime_write(struct cgroup *cgrp, struct cftype *cft, +static int cpu_rt_runtime_write(struct cgroup *cgrp, struct cftype *cft, s64 val) { return sched_group_set_rt_runtime(cgroup_tg(cgrp), val); diff --git a/kernel/semaphore.c b/kernel/semaphore.c index 5e41217239e8..5c2942e768cd 100644 --- a/kernel/semaphore.c +++ b/kernel/semaphore.c @@ -54,9 +54,10 @@ void down(struct semaphore *sem) unsigned long flags; spin_lock_irqsave(&sem->lock, flags); - if (unlikely(!sem->count)) + if (likely(sem->count > 0)) + sem->count--; + else __down(sem); - sem->count--; spin_unlock_irqrestore(&sem->lock, flags); } EXPORT_SYMBOL(down); @@ -76,10 +77,10 @@ int down_interruptible(struct semaphore *sem) int result = 0; spin_lock_irqsave(&sem->lock, flags); - if (unlikely(!sem->count)) - result = __down_interruptible(sem); - if (!result) + if (likely(sem->count > 0)) sem->count--; + else + result = __down_interruptible(sem); spin_unlock_irqrestore(&sem->lock, flags); return result; @@ -102,10 +103,10 @@ int down_killable(struct semaphore *sem) int result = 0; spin_lock_irqsave(&sem->lock, flags); - if (unlikely(!sem->count)) - result = __down_killable(sem); - if (!result) + if (likely(sem->count > 0)) sem->count--; + else + result = __down_killable(sem); spin_unlock_irqrestore(&sem->lock, flags); return result; @@ -156,10 +157,10 @@ int down_timeout(struct semaphore *sem, long jiffies) int result = 0; spin_lock_irqsave(&sem->lock, flags); - if (unlikely(!sem->count)) - result = __down_timeout(sem, jiffies); - if (!result) + if (likely(sem->count > 0)) sem->count--; + else + result = __down_timeout(sem, jiffies); spin_unlock_irqrestore(&sem->lock, flags); return result; @@ -178,8 +179,9 @@ void up(struct semaphore *sem) unsigned long flags; spin_lock_irqsave(&sem->lock, flags); - sem->count++; - if (unlikely(!list_empty(&sem->wait_list))) + if (likely(list_empty(&sem->wait_list))) + sem->count++; + else __up(sem); spin_unlock_irqrestore(&sem->lock, flags); } @@ -190,6 +192,7 @@ EXPORT_SYMBOL(up); struct semaphore_waiter { struct list_head list; struct task_struct *task; + int up; }; /* @@ -202,34 +205,33 @@ static inline int __sched __down_common(struct semaphore *sem, long state, { struct task_struct *task = current; struct semaphore_waiter waiter; - int ret = 0; - waiter.task = task; list_add_tail(&waiter.list, &sem->wait_list); + waiter.task = task; + waiter.up = 0; for (;;) { - if (state == TASK_INTERRUPTIBLE && signal_pending(task)) { - ret = -EINTR; - break; - } - if (state == TASK_KILLABLE && fatal_signal_pending(task)) { - ret = -EINTR; - break; - } - if (timeout <= 0) { - ret = -ETIME; - break; - } + if (state == TASK_INTERRUPTIBLE && signal_pending(task)) + goto interrupted; + if (state == TASK_KILLABLE && fatal_signal_pending(task)) + goto interrupted; + if (timeout <= 0) + goto timed_out; __set_task_state(task, state); spin_unlock_irq(&sem->lock); timeout = schedule_timeout(timeout); spin_lock_irq(&sem->lock); - if (sem->count > 0) - break; + if (waiter.up) + return 0; } + timed_out: + list_del(&waiter.list); + return -ETIME; + + interrupted: list_del(&waiter.list); - return ret; + return -EINTR; } static noinline void __sched __down(struct semaphore *sem) @@ -256,5 +258,7 @@ static noinline void __sched __up(struct semaphore *sem) { struct semaphore_waiter *waiter = list_first_entry(&sem->wait_list, struct semaphore_waiter, list); + list_del(&waiter->list); + waiter->up = 1; wake_up_process(waiter->task); } diff --git a/kernel/sysctl.c b/kernel/sysctl.c index d7ffdc59816a..29116652dca8 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -81,6 +81,7 @@ extern int compat_log; extern int maps_protect; extern int sysctl_stat_interval; extern int latencytop_enabled; +extern int sysctl_nr_open_min, sysctl_nr_open_max; /* Constants used for minimum and maximum */ #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM) @@ -1190,7 +1191,9 @@ static struct ctl_table fs_table[] = { .data = &sysctl_nr_open, .maxlen = sizeof(int), .mode = 0644, - .proc_handler = &proc_dointvec, + .proc_handler = &proc_dointvec_minmax, + .extra1 = &sysctl_nr_open_min, + .extra2 = &sysctl_nr_open_max, }, { .ctl_name = FS_DENTRY, |