From 54ed1444052467044e9e01334ac8123dd6345211 Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (Red Hat)" Date: Tue, 3 Nov 2015 16:19:02 -0500 Subject: 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 --- kernel/trace/ring_buffer_benchmark.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c index 9e00fd178226..6df9a83e20d7 100644 --- 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); } -- cgit v1.2.3