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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>