1 files changed, 2 insertions, 1 deletions

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 508235a39da6..632191770aac 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -405,8 +405,9 @@ struct trace_iterator {
         struct trace_array      *tr;
         struct tracer           *trace;
         void                    *private;
-        struct ring_buffer_iter *buffer_iter[NR_CPUS];
         int                     cpu_file;
+        struct mutex            mutex;
+        struct ring_buffer_iter *buffer_iter[NR_CPUS];
 
         /* The below is zeroed out in pipe_read */
         struct trace_seq        seq;