sched/__wake_up_sync_key(): Fix nr_exclusive tasks which lead to WF_SYNC clearing
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>
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@ -2660,7 +2660,7 @@ void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode,
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if (unlikely(!q))
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return;
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if (unlikely(!nr_exclusive))
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if (unlikely(nr_exclusive != 1))
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wake_flags = 0;
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spin_lock_irqsave(&q->lock, flags);
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