test_and_set_bit() already implies a memory barrier.
Signed-off-by: Peng Tao <bergwolf@xxxxxxxxx>
---
drivers/vhost/vhost.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index c6f2d89..2663543 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -261,8 +261,8 @@ void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work)
if (!test_and_set_bit(VHOST_WORK_QUEUED, &work->flags)) {
/* We can only add the work to the list after we're
* sure it was not in the list.
+ * test_and_set_bit() implies a memory barrier.
*/
- smp_mb();
llist_add(&work->node, &dev->work_list);
wake_up_process(dev->worker);
}
--
2.7.4
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