Commit 63342411 authored May 05, 2014 by Peter Zijlstra Committed by Ingo Molnar May 07, 2014

perf: Validate locking assumption



Document and validate the locking assumption of event_sched_in().

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-sybq1publ9xt5no77cwvi0eo@git.kernel.org


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 15a2d4de

kernel/events/core.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1678,6 +1678,8 @@ event_sched_in(struct perf_event *event,
		u64 tstamp = perf_event_time(event);
		int ret = 0;

		lockdep_assert_held(&ctx->lock);

		if (event->state <= PERF_EVENT_STATE_OFF)
		return 0;