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sched/__wake_up_sync_key(): Fix nr_exclusive tasks which lead to WF_SYNC clearing

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Only one task can replace the waker.

Signed-off-by: Kirill Tkhai <tkhai@yandex.ru>
CC: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/512421372963700@web25f.yandex.ru
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kirill Tkhai 2013-07-04 22:48:20 +04:00 committed by Ingo Molnar
parent 971ee28cbd
commit cedce3e730
1 changed files with 1 additions and 1 deletions
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2
kernel/sched/core.c
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@ -2660,7 +2660,7 @@ void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode,
if (unlikely(!q))
return;
if (unlikely(!nr_exclusive))
if (unlikely(nr_exclusive != 1))
wake_flags = 0;
spin_lock_irqsave(&q->lock, flags);