It looks strange to initialize the completions repeatedly.
This patch uses static initialization. It simplifies the code
and even helps to get rid of two memory barriers.
Signed-off-by: Petr Mladek <pmla...@suse.com>
---
kernel/trace/ring_buffer_benchmark.c | 12 ++----------
1 file changed, 2 insertions(+), 10 deletions(-)
diff --git a/kernel/trace/ring_buffer_benchmark.c
b/kernel/trace/ring_buffer_benchmark.c
index a1503a027ee2..ccb1a0b95f64 100644
--- a/kernel/trace/ring_buffer_benchmark.c
+++ b/kernel/trace/ring_buffer_benchmark.c
@@ -24,8 +24,8 @@ struct rb_page {
static int wakeup_interval = 100;
static int reader_finish;
-static struct completion read_start;
-static struct completion read_done;
+static DECLARE_COMPLETION(read_start);
+static DECLARE_COMPLETION(read_done);
static struct ring_buffer *buffer;
static struct task_struct *producer;
@@ -270,11 +270,6 @@ static void ring_buffer_producer(void)
trace_printk("End ring buffer hammer\n");
if (consumer) {
- /* Init both completions here to avoid races */
- init_completion(&read_start);
- init_completion(&read_done);
- /* the completions must be visible before the finish var */
- smp_wmb();
reader_finish = 1;
/* finish var visible before waking up the consumer */
smp_wmb();
@@ -389,13 +384,10 @@ static int ring_buffer_consumer_thread(void *arg)
static int ring_buffer_producer_thread(void *arg)
{
- init_completion(&read_start);
-
while (!kthread_should_stop() && !kill_test) {
ring_buffer_reset(buffer);
if (consumer) {
- smp_wmb();
wake_up_process(consumer);
wait_for_completion(&read_start);
}
--
1.8.5.6
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