diff options
| -rw-r--r-- | kernel/trace/trace_sched_switch.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c index b8f56beb1a6..59de5141207 100644 --- a/kernel/trace/trace_sched_switch.c +++ b/kernel/trace/trace_sched_switch.c @@ -17,6 +17,7 @@ static struct trace_array *ctx_trace; static int __read_mostly tracer_enabled; static atomic_t sched_ref; +static DEFINE_MUTEX(tracepoint_mutex); static void probe_sched_switch(struct rq *__rq, struct task_struct *prev, @@ -125,18 +126,22 @@ static void tracing_start_sched_switch(void) { long ref; + mutex_lock(&tracepoint_mutex); ref = atomic_inc_return(&sched_ref); if (ref == 1) tracing_sched_register(); + mutex_unlock(&tracepoint_mutex); } static void tracing_stop_sched_switch(void) { long ref; + mutex_lock(&tracepoint_mutex); ref = atomic_dec_and_test(&sched_ref); if (ref) tracing_sched_unregister(); + mutex_unlock(&tracepoint_mutex); } void tracing_start_cmdline_record(void) |