From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael S. Tsirkin" Subject: Re: [PATCH 1/2] virtio: fix typos of memory barriers Date: Sun, 22 Jan 2012 13:47:46 +0200 Message-ID: <20120122114746.GC27222@redhat.com> References: <20120120081658.50747.10625.stgit@amd-6168-8-1.englab.nay.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org To: Jason Wang Return-path: Content-Disposition: inline In-Reply-To: <20120120081658.50747.10625.stgit@amd-6168-8-1.englab.nay.redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org List-Id: netdev.vger.kernel.org On Fri, Jan 20, 2012 at 04:16:59PM +0800, Jason Wang wrote: > Signed-off-by: Jason Wang Good catch. Note: this fixes a bug introduced by 7b21e34fd1c272e3a8c3846168f2f6287a4cd72b. It's probably a good idea to mention this is the commit log. Acked-by: Michael S. Tsirkin > --- > drivers/virtio/virtio_ring.c | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) > > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c > index 79e1b29..78428a8 100644 > --- a/drivers/virtio/virtio_ring.c > +++ b/drivers/virtio/virtio_ring.c > @@ -35,7 +35,7 @@ > #define virtio_rmb(vq) \ > do { if ((vq)->weak_barriers) smp_rmb(); else rmb(); } while(0) > #define virtio_wmb(vq) \ > - do { if ((vq)->weak_barriers) smp_rmb(); else rmb(); } while(0) > + do { if ((vq)->weak_barriers) smp_wmb(); else wmb(); } while(0) > #else > /* We must force memory ordering even if guest is UP since host could be > * running on another CPU, but SMP barriers are defined to barrier() in that