diff options
| author | Peter Zijlstra | 2014-05-05 11:49:16 +0200 |
|---|---|---|
| committer | Ingo Molnar | 2014-05-07 13:44:18 +0200 |
| commit | 63342411efd2d9350ad405205da036cd45ed1640 (patch) | |
| tree | 61eabbb0fdd2a3a940f3d7aa7599d10124d3d915 | |
| parent | 15a2d4de0eab533a76bee9e68d7e1063dd25401c (diff) | |
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.c | 2 |
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; |