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Diffstat (limited to 'kernel/cpu.c')
-rw-r--r--kernel/cpu.c157
1 files changed, 110 insertions, 47 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 8ea32e8d68b0..79e40f00dcb8 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -15,29 +15,8 @@
#include <linux/stop_machine.h>
#include <linux/mutex.h>
-/*
- * Represents all cpu's present in the system
- * In systems capable of hotplug, this map could dynamically grow
- * as new cpu's are detected in the system via any platform specific
- * method, such as ACPI for e.g.
- */
-cpumask_t cpu_present_map __read_mostly;
-EXPORT_SYMBOL(cpu_present_map);
-
-#ifndef CONFIG_SMP
-
-/*
- * Represents all cpu's that are currently online.
- */
-cpumask_t cpu_online_map __read_mostly = CPU_MASK_ALL;
-EXPORT_SYMBOL(cpu_online_map);
-
-cpumask_t cpu_possible_map __read_mostly = CPU_MASK_ALL;
-EXPORT_SYMBOL(cpu_possible_map);
-
-#else /* CONFIG_SMP */
-
-/* Serializes the updates to cpu_online_map, cpu_present_map */
+#ifdef CONFIG_SMP
+/* Serializes the updates to cpu_online_mask, cpu_present_mask */
static DEFINE_MUTEX(cpu_add_remove_lock);
static __cpuinitdata RAW_NOTIFIER_HEAD(cpu_chain);
@@ -64,8 +43,6 @@ void __init cpu_hotplug_init(void)
cpu_hotplug.refcount = 0;
}
-cpumask_t cpu_active_map;
-
#ifdef CONFIG_HOTPLUG_CPU
void get_online_cpus(void)
@@ -96,7 +73,7 @@ EXPORT_SYMBOL_GPL(put_online_cpus);
/*
* The following two API's must be used when attempting
- * to serialize the updates to cpu_online_map, cpu_present_map.
+ * to serialize the updates to cpu_online_mask, cpu_present_mask.
*/
void cpu_maps_update_begin(void)
{
@@ -217,7 +194,7 @@ static int __ref take_cpu_down(void *_param)
static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
{
int err, nr_calls = 0;
- cpumask_t old_allowed, tmp;
+ cpumask_var_t old_allowed;
void *hcpu = (void *)(long)cpu;
unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0;
struct take_cpu_down_param tcd_param = {
@@ -231,6 +208,9 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
if (!cpu_online(cpu))
return -EINVAL;
+ if (!alloc_cpumask_var(&old_allowed, GFP_KERNEL))
+ return -ENOMEM;
+
cpu_hotplug_begin();
err = __raw_notifier_call_chain(&cpu_chain, CPU_DOWN_PREPARE | mod,
hcpu, -1, &nr_calls);
@@ -245,13 +225,11 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
}
/* Ensure that we are not runnable on dying cpu */
- old_allowed = current->cpus_allowed;
- cpus_setall(tmp);
- cpu_clear(cpu, tmp);
- set_cpus_allowed_ptr(current, &tmp);
- tmp = cpumask_of_cpu(cpu);
+ cpumask_copy(old_allowed, &current->cpus_allowed);
+ set_cpus_allowed_ptr(current,
+ cpumask_of(cpumask_any_but(cpu_online_mask, cpu)));
- err = __stop_machine(take_cpu_down, &tcd_param, &tmp);
+ err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu));
if (err) {
/* CPU didn't die: tell everyone. Can't complain. */
if (raw_notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED | mod,
@@ -277,7 +255,7 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
check_for_tasks(cpu);
out_allowed:
- set_cpus_allowed_ptr(current, &old_allowed);
+ set_cpus_allowed_ptr(current, old_allowed);
out_release:
cpu_hotplug_done();
if (!err) {
@@ -285,13 +263,17 @@ out_release:
hcpu) == NOTIFY_BAD)
BUG();
}
+ free_cpumask_var(old_allowed);
return err;
}
int __ref cpu_down(unsigned int cpu)
{
- int err = 0;
+ int err;
+ err = stop_machine_create();
+ if (err)
+ return err;
cpu_maps_update_begin();
if (cpu_hotplug_disabled) {
@@ -303,7 +285,7 @@ int __ref cpu_down(unsigned int cpu)
/*
* Make sure the all cpus did the reschedule and are not
- * using stale version of the cpu_active_map.
+ * using stale version of the cpu_active_mask.
* This is not strictly necessary becuase stop_machine()
* that we run down the line already provides the required
* synchronization. But it's really a side effect and we do not
@@ -318,6 +300,7 @@ int __ref cpu_down(unsigned int cpu)
out:
cpu_maps_update_done();
+ stop_machine_destroy();
return err;
}
EXPORT_SYMBOL(cpu_down);
@@ -367,7 +350,7 @@ out_notify:
int __cpuinit cpu_up(unsigned int cpu)
{
int err = 0;
- if (!cpu_isset(cpu, cpu_possible_map)) {
+ 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);
#if defined(CONFIG_IA64) || defined(CONFIG_X86_64)
@@ -392,25 +375,28 @@ out:
}
#ifdef CONFIG_PM_SLEEP_SMP
-static cpumask_t frozen_cpus;
+static cpumask_var_t frozen_cpus;
int disable_nonboot_cpus(void)
{
- int cpu, first_cpu, error = 0;
+ int cpu, first_cpu, error;
+ error = stop_machine_create();
+ if (error)
+ return error;
cpu_maps_update_begin();
- first_cpu = first_cpu(cpu_online_map);
+ first_cpu = cpumask_first(cpu_online_mask);
/* We take down all of the non-boot CPUs in one shot to avoid races
* with the userspace trying to use the CPU hotplug at the same time
*/
- cpus_clear(frozen_cpus);
+ cpumask_clear(frozen_cpus);
printk("Disabling non-boot CPUs ...\n");
for_each_online_cpu(cpu) {
if (cpu == first_cpu)
continue;
error = _cpu_down(cpu, 1);
if (!error) {
- cpu_set(cpu, frozen_cpus);
+ cpumask_set_cpu(cpu, frozen_cpus);
printk("CPU%d is down\n", cpu);
} else {
printk(KERN_ERR "Error taking CPU%d down: %d\n",
@@ -426,6 +412,7 @@ int disable_nonboot_cpus(void)
printk(KERN_ERR "Non-boot CPUs are not disabled\n");
}
cpu_maps_update_done();
+ stop_machine_destroy();
return error;
}
@@ -436,11 +423,11 @@ void __ref enable_nonboot_cpus(void)
/* Allow everyone to use the CPU hotplug again */
cpu_maps_update_begin();
cpu_hotplug_disabled = 0;
- if (cpus_empty(frozen_cpus))
+ if (cpumask_empty(frozen_cpus))
goto out;
printk("Enabling non-boot CPUs ...\n");
- for_each_cpu_mask_nr(cpu, frozen_cpus) {
+ for_each_cpu(cpu, frozen_cpus) {
error = _cpu_up(cpu, 1);
if (!error) {
printk("CPU%d is up\n", cpu);
@@ -448,10 +435,18 @@ void __ref enable_nonboot_cpus(void)
}
printk(KERN_WARNING "Error taking CPU%d up: %d\n", cpu, error);
}
- cpus_clear(frozen_cpus);
+ cpumask_clear(frozen_cpus);
out:
cpu_maps_update_done();
}
+
+static int alloc_frozen_cpus(void)
+{
+ if (!alloc_cpumask_var(&frozen_cpus, GFP_KERNEL|__GFP_ZERO))
+ return -ENOMEM;
+ return 0;
+}
+core_initcall(alloc_frozen_cpus);
#endif /* CONFIG_PM_SLEEP_SMP */
/**
@@ -467,7 +462,7 @@ void __cpuinit notify_cpu_starting(unsigned int cpu)
unsigned long val = CPU_STARTING;
#ifdef CONFIG_PM_SLEEP_SMP
- if (cpu_isset(cpu, frozen_cpus))
+ if (frozen_cpus != NULL && cpumask_test_cpu(cpu, frozen_cpus))
val = CPU_STARTING_FROZEN;
#endif /* CONFIG_PM_SLEEP_SMP */
raw_notifier_call_chain(&cpu_chain, val, (void *)(long)cpu);
@@ -479,7 +474,7 @@ void __cpuinit notify_cpu_starting(unsigned int cpu)
* cpu_bit_bitmap[] is a special, "compressed" data structure that
* represents all NR_CPUS bits binary values of 1<<nr.
*
- * It is used by cpumask_of_cpu() to get a constant address to a CPU
+ * It is used by cpumask_of() to get a constant address to a CPU
* mask value that has a single bit set only.
*/
@@ -502,3 +497,71 @@ EXPORT_SYMBOL_GPL(cpu_bit_bitmap);
const DECLARE_BITMAP(cpu_all_bits, NR_CPUS) = CPU_BITS_ALL;
EXPORT_SYMBOL(cpu_all_bits);
+
+#ifdef CONFIG_INIT_ALL_POSSIBLE
+static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly
+ = CPU_BITS_ALL;
+#else
+static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly;
+#endif
+const struct cpumask *const cpu_possible_mask = to_cpumask(cpu_possible_bits);
+EXPORT_SYMBOL(cpu_possible_mask);
+
+static DECLARE_BITMAP(cpu_online_bits, CONFIG_NR_CPUS) __read_mostly;
+const struct cpumask *const cpu_online_mask = to_cpumask(cpu_online_bits);
+EXPORT_SYMBOL(cpu_online_mask);
+
+static DECLARE_BITMAP(cpu_present_bits, CONFIG_NR_CPUS) __read_mostly;
+const struct cpumask *const cpu_present_mask = to_cpumask(cpu_present_bits);
+EXPORT_SYMBOL(cpu_present_mask);
+
+static DECLARE_BITMAP(cpu_active_bits, CONFIG_NR_CPUS) __read_mostly;
+const struct cpumask *const cpu_active_mask = to_cpumask(cpu_active_bits);
+EXPORT_SYMBOL(cpu_active_mask);
+
+void set_cpu_possible(unsigned int cpu, bool possible)
+{
+ if (possible)
+ cpumask_set_cpu(cpu, to_cpumask(cpu_possible_bits));
+ else
+ cpumask_clear_cpu(cpu, to_cpumask(cpu_possible_bits));
+}
+
+void set_cpu_present(unsigned int cpu, bool present)
+{
+ if (present)
+ cpumask_set_cpu(cpu, to_cpumask(cpu_present_bits));
+ else
+ cpumask_clear_cpu(cpu, to_cpumask(cpu_present_bits));
+}
+
+void set_cpu_online(unsigned int cpu, bool online)
+{
+ if (online)
+ cpumask_set_cpu(cpu, to_cpumask(cpu_online_bits));
+ else
+ cpumask_clear_cpu(cpu, to_cpumask(cpu_online_bits));
+}
+
+void set_cpu_active(unsigned int cpu, bool active)
+{
+ if (active)
+ cpumask_set_cpu(cpu, to_cpumask(cpu_active_bits));
+ else
+ cpumask_clear_cpu(cpu, to_cpumask(cpu_active_bits));
+}
+
+void init_cpu_present(const struct cpumask *src)
+{
+ cpumask_copy(to_cpumask(cpu_present_bits), src);
+}
+
+void init_cpu_possible(const struct cpumask *src)
+{
+ cpumask_copy(to_cpumask(cpu_possible_bits), src);
+}
+
+void init_cpu_online(const struct cpumask *src)
+{
+ cpumask_copy(to_cpumask(cpu_online_bits), src);
+}