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[RFC][PATCH 01/12] perf: Add lockdep assertions

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  [RFC][PATCH 01/12] perf: Add lockdep assertions Peter Zijlstra <peterz@infradead.org> - 2016-01-11 17:40 +0100

#1306476 — [RFC][PATCH 01/12] perf: Add lockdep assertions

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 kernel/events/core.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -1246,6 +1246,8 @@ ctx_group_list(struct perf_event *event,
 static void
 list_add_event(struct perf_event *event, struct perf_event_context *ctx)
 {
+	lockdep_assert_held(&ctx->lock);
+
 	WARN_ON_ONCE(event->attach_state & PERF_ATTACH_CONTEXT);
 	event->attach_state |= PERF_ATTACH_CONTEXT;
 
@@ -2342,8 +2344,10 @@ static void ctx_sched_out(struct perf_ev
 			  struct perf_cpu_context *cpuctx,
 			  enum event_type_t event_type)
 {
-	struct perf_event *event;
 	int is_active = ctx->is_active;
+	struct perf_event *event;
+
+	lockdep_assert_held(&ctx->lock);
 
 	ctx->is_active &= ~event_type;
 	if (likely(!ctx->nr_events))
@@ -2725,8 +2729,10 @@ ctx_sched_in(struct perf_event_context *
 	     enum event_type_t event_type,
 	     struct task_struct *task)
 {
-	u64 now;
 	int is_active = ctx->is_active;
+	u64 now;
+
+	lockdep_assert_held(&ctx->lock);
 
 	ctx->is_active |= event_type;
 	if (likely(!ctx->nr_events))

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