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vhost: remove unnecessary smp_mb from vhost_work_queue 

test_and_set_bit() already implies a memory barrier.

Signed-off-by: Peng Tao <bergwolf@gmail.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peng Tao 2016-12-07 17:52:19 +08:00 committed by David S. Miller
parent 1440a3a12b
commit 635abf0191
1 changed files with 1 additions and 1 deletions
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2
drivers/vhost/vhost.c
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@ -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);
}