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sched/wait: Add __wake_up_all_locked() API

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For code which protects the waitqueue itself with another lock it
makes no sense to acquire the waitqueue lock for wakeup all. Provide
__wake_up_all_locked().

This is an optimization on the vanilla kernel (to be used by the
PCI code) and an important semantic distinction on -rt.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-ux6m4b8jonb9inx8xafh77ds@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner
2011-12-01 00:04:00 +01:00
committed by Ingo Molnar
parent ba74c1448f
commit 63b2001169
2 changed files with 5 additions and 4 deletions
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4
kernel/sched/core.c
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@@ -3418,9 +3418,9 @@ EXPORT_SYMBOL(__wake_up);
/*
* Same as __wake_up but called with the spinlock in wait_queue_head_t held.
*/
void __wake_up_locked(wait_queue_head_t *q, unsigned int mode)
void __wake_up_locked(wait_queue_head_t *q, unsigned int mode, int nr)
{
__wake_up_common(q, mode, 1, 0, NULL);
__wake_up_common(q, mode, nr, 0, NULL);
}
EXPORT_SYMBOL_GPL(__wake_up_locked);