ring_buffer: Remove unneeded smp_wmb() before wakeup of reader benchmark

wake_up_process() has a memory barrier before doing anything, thus adding a
memory barrier before calling it is redundant.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c
index 9e00fd1..6df9a83 100644 (file)
--- a/kernel/trace/ring_buffer_benchmark.c
+++ b/kernel/trace/ring_buffer_benchmark.c
@@ -288,8 +288,6 @@ static void ring_buffer_producer(void)
                /* the completions must be visible before the finish var */
                smp_wmb();
                reader_finish = 1;
-               /* finish var visible before waking up the consumer */
-               smp_wmb();
                wake_up_process(consumer);
                wait_for_completion(&read_done);
        }