diff --git a/[refs] b/[refs]
index 6c7e90776f1f..a39cdc3c9c09 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 28009ce4a8130af7260a9271901b4419834ad152
+refs/heads/master: b7526f0ca6dc68f57ca467ce503151b1d476a3e4
diff --git a/trunk/kernel/events/core.c b/trunk/kernel/events/core.c
index e4aee519572d..2293e0b084a9 100644
--- a/trunk/kernel/events/core.c
+++ b/trunk/kernel/events/core.c
@@ -748,6 +748,7 @@ static u64 perf_event_time(struct perf_event *event)
 
 /*
  * Update the total_time_enabled and total_time_running fields for a event.
+ * The caller of this function needs to hold the ctx->lock.
  */
 static void update_event_times(struct perf_event *event)
 {