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cpu-hotplug: introduce cpu_notify(), __cpu_notify(), cpu_notify_nofail()

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No functional change.  These are just wrappers of
raw_cpu_notifier_call_chain.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Akinobu Mita 2010-05-26 14:43:28 -07:00 committed by Linus Torvalds
parent 36e15263aa
commit e9fb7631eb
1 changed files with 31 additions and 23 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

54
kernel/cpu.c
View file

@ -134,6 +134,26 @@ int __ref register_cpu_notifier(struct notifier_block *nb)
return ret;
}
static int __cpu_notify(unsigned long val, void *v, int nr_to_call,
int *nr_calls)
{
return __raw_notifier_call_chain(&cpu_chain, val, v, nr_to_call,
nr_calls);
}
static int cpu_notify(unsigned long val, void *v)
{
return __cpu_notify(val, v, -1, NULL);
}
static void cpu_notify_nofail(unsigned long val, void *v)
{
int err;
err = cpu_notify(val, v);
BUG_ON(err == NOTIFY_BAD);
}
#ifdef CONFIG_HOTPLUG_CPU
EXPORT_SYMBOL(register_cpu_notifier);
@ -181,8 +201,7 @@ static int __ref take_cpu_down(void *_param)
if (err < 0)
return err;
raw_notifier_call_chain(&cpu_chain, CPU_DYING | param->mod,
param->hcpu);
cpu_notify(CPU_DYING | param->mod, param->hcpu);
if (task_cpu(param->caller) == cpu)
move_task_off_dead_cpu(cpu, param->caller);
@ -212,14 +231,12 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
cpu_hotplug_begin();
set_cpu_active(cpu, false);
err = __raw_notifier_call_chain(&cpu_chain, CPU_DOWN_PREPARE | mod,
hcpu, -1, &nr_calls);
err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls);
if (err == NOTIFY_BAD) {
set_cpu_active(cpu, true);
nr_calls--;
__raw_notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED | mod,
hcpu, nr_calls, NULL);
__cpu_notify(CPU_DOWN_FAILED | mod, hcpu, nr_calls, NULL);
printk("%s: attempt to take down CPU %u failed\n",
__func__, cpu);
err = -EINVAL;
@ -230,9 +247,7 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
if (err) {
set_cpu_active(cpu, true);
/* CPU didn't die: tell everyone. Can't complain. */
if (raw_notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED | mod,
hcpu) == NOTIFY_BAD)
BUG();
cpu_notify_nofail(CPU_DOWN_FAILED | mod, hcpu);
goto out_release;
}
@ -246,19 +261,14 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
__cpu_die(cpu);
/* CPU is completely dead: tell everyone. Too late to complain. */
if (raw_notifier_call_chain(&cpu_chain, CPU_DEAD | mod,
hcpu) == NOTIFY_BAD)
BUG();
cpu_notify_nofail(CPU_DEAD | mod, hcpu);
check_for_tasks(cpu);
out_release:
cpu_hotplug_done();
if (!err) {
if (raw_notifier_call_chain(&cpu_chain, CPU_POST_DEAD | mod,
hcpu) == NOTIFY_BAD)
BUG();
}
if (!err)
cpu_notify_nofail(CPU_POST_DEAD | mod, hcpu);
return err;
}
@ -293,8 +303,7 @@ static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen)
return -EINVAL;
cpu_hotplug_begin();
ret = __raw_notifier_call_chain(&cpu_chain, CPU_UP_PREPARE | mod, hcpu,
-1, &nr_calls);
ret = __cpu_notify(CPU_UP_PREPARE | mod, hcpu, -1, &nr_calls);
if (ret == NOTIFY_BAD) {
nr_calls--;
printk("%s: attempt to bring up CPU %u failed\n",
@ -312,12 +321,11 @@ static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen)
set_cpu_active(cpu, true);
/* Now call notifier in preparation. */
raw_notifier_call_chain(&cpu_chain, CPU_ONLINE | mod, hcpu);
cpu_notify(CPU_ONLINE | mod, hcpu);
out_notify:
if (ret != 0)
__raw_notifier_call_chain(&cpu_chain,
CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL);
__cpu_notify(CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL);
cpu_hotplug_done();
return ret;
@ -481,7 +489,7 @@ void __cpuinit notify_cpu_starting(unsigned int cpu)
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);
cpu_notify(val, (void *)(long)cpu);
}
#endif /* CONFIG_SMP */