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authorPeter Zijlstra <peterz@infradead.org>2014-05-05 13:49:16 +0400
committerIngo Molnar <mingo@kernel.org>2014-05-07 15:44:18 +0400
commit63342411efd2d9350ad405205da036cd45ed1640 (patch)
tree61eabbb0fdd2a3a940f3d7aa7599d10124d3d915
parent15a2d4de0eab533a76bee9e68d7e1063dd25401c (diff)
downloadlinux-63342411efd2d9350ad405205da036cd45ed1640.tar.xz
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>
-rw-r--r--kernel/events/core.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 819ffc006d67..0de199729f04 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -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;