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simple-wait: rename and export the equivalent of waitqueue_active() 

The function "swait_head_has_waiters()" was internalized into
wait-simple.c but it parallels the waitqueue_active of normal
waitqueue support. Given that there are over 150 waitqueue_active
users in drivers/ fs/ kernel/ and the like, lets make it globally
visible, and rename it to parallel the waitqueue_active accordingly.
We'll need to do this if we expect to expand its usage beyond RT.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
This commit is contained in:
Paul Gortmaker 2013-08-27 14:20:26 -04:00 committed by Alibek Omarov
parent 65870d64d3
commit ca0179a36a
2 changed files with 9 additions and 9 deletions
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8
include/linux/wait-simple.h
View File

@ -47,6 +47,14 @@ extern void swait_prepare(struct swait_head *head, struct swaiter *w, int state)
extern void swait_finish_locked(struct swait_head *head, struct swaiter *w);
extern void swait_finish(struct swait_head *head, struct swaiter *w);
/* Check whether a head has waiters enqueued */
static inline bool swaitqueue_active(struct swait_head *h)
{
/* Make sure the condition is visible before checking list_empty() */
smp_mb();
return !list_empty(&h->list);
}
/*
* Wakeup functions
*/

10
kernel/sched/wait-simple.c
View File

@ -26,14 +26,6 @@ static inline void __swait_dequeue(struct swaiter *w)
list_del_init(&w->node);
}
/* Check whether a head has waiters enqueued */
static inline bool swait_head_has_waiters(struct swait_head *h)
{
/* Make sure the condition is visible before checking list_empty() */
smp_mb();
return !list_empty(&h->list);
}
void __init_swait_head(struct swait_head *head, struct lock_class_key *key)
{
raw_spin_lock_init(&head->lock);
@ -112,7 +104,7 @@ __swait_wake(struct swait_head *head, unsigned int state, unsigned int num)
unsigned long flags;
int woken;
if (!swait_head_has_waiters(head))
if (!swaitqueue_active(head))
return 0;
raw_spin_lock_irqsave(&head->lock, flags);