From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peng Tao Subject: [PATCH 2/2] vhost: remove unnecessary smp_mb from vhost_work_queue Date: Wed, 7 Dec 2016 17:52:19 +0800 Message-ID: <1481104340-77035-2-git-send-email-bergwolf@gmail.com> References: <1481104340-77035-1-git-send-email-bergwolf@gmail.com> Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, Peng Tao To: Stefan Hajnoczi Return-path: In-Reply-To: <1481104340-77035-1-git-send-email-bergwolf@gmail.com> Sender: netdev-owner@vger.kernel.org List-Id: kvm.vger.kernel.org test_and_set_bit() already implies a memory barrier. Signed-off-by: Peng Tao --- 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