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-rw-r--r--kernel/trace/ring_buffer.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index b08ee9f00c8d..231db209fa82 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -51,8 +51,14 @@ void tracing_off(void)
/* FIXME!!! */
u64 ring_buffer_time_stamp(int cpu)
{
+ u64 time;
+
+ preempt_disable_notrace();
/* shift to debug/test normalization and TIME_EXTENTS */
- return sched_clock() << DEBUG_SHIFT;
+ time = sched_clock() << DEBUG_SHIFT;
+ preempt_enable_notrace();
+
+ return time;
}
void ring_buffer_normalize_time_stamp(int cpu, u64 *ts)