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sched/core: Update preempt_notifier_key to modern API

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No changes in refcount semantics, use DEFINE_STATIC_KEY_FALSE()
for initialization and replace:

  static_key_slow_inc|dec()   =>   static_branch_inc|dec()
  static_key_false()          =>   static_branch_unlikely()

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: akpm@linux-foundation.org
Link: http://lkml.kernel.org/r/20180326210929.5244-4-dave@stgolabs.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Davidlohr Bueso 2018-03-26 14:09:26 -07:00 committed by Ingo Molnar
parent e97a90f706
commit b720342849
1 changed files with 6 additions and 6 deletions
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12
kernel/sched/core.c
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@ -2462,17 +2462,17 @@ void wake_up_new_task(struct task_struct *p)
#ifdef CONFIG_PREEMPT_NOTIFIERS
static struct static_key preempt_notifier_key = STATIC_KEY_INIT_FALSE;
static DEFINE_STATIC_KEY_FALSE(preempt_notifier_key);
void preempt_notifier_inc(void)
{
static_key_slow_inc(&preempt_notifier_key);
static_branch_inc(&preempt_notifier_key);
}
EXPORT_SYMBOL_GPL(preempt_notifier_inc);
void preempt_notifier_dec(void)
{
static_key_slow_dec(&preempt_notifier_key);
static_branch_dec(&preempt_notifier_key);
}
EXPORT_SYMBOL_GPL(preempt_notifier_dec);
@ -2482,7 +2482,7 @@ EXPORT_SYMBOL_GPL(preempt_notifier_dec);
*/
void preempt_notifier_register(struct preempt_notifier *notifier)
{
if (!static_key_false(&preempt_notifier_key))
if (!static_branch_unlikely(&preempt_notifier_key))
WARN(1, "registering preempt_notifier while notifiers disabled\n");
hlist_add_head(&notifier->link, &current->preempt_notifiers);
@ -2511,7 +2511,7 @@ static void __fire_sched_in_preempt_notifiers(struct task_struct *curr)
static __always_inline void fire_sched_in_preempt_notifiers(struct task_struct *curr)
{
if (static_key_false(&preempt_notifier_key))
if (static_branch_unlikely(&preempt_notifier_key))
__fire_sched_in_preempt_notifiers(curr);
}
@ -2529,7 +2529,7 @@ static __always_inline void
fire_sched_out_preempt_notifiers(struct task_struct *curr,
struct task_struct *next)
{
if (static_key_false(&preempt_notifier_key))
if (static_branch_unlikely(&preempt_notifier_key))
__fire_sched_out_preempt_notifiers(curr, next);
}