Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755505AbcKVPEk (ORCPT ); Tue, 22 Nov 2016 10:04:40 -0500 Received: from mx1.redhat.com ([209.132.183.28]:40948 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751401AbcKVPEj (ORCPT ); Tue, 22 Nov 2016 10:04:39 -0500 Date: Tue, 22 Nov 2016 17:04:37 +0200 From: "Michael S. Tsirkin" To: Gonglei Cc: virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, jasowang@redhat.com, david@gibson.dropbear.id.au, thuth@redhat.com Subject: Re: [PATCH 2/2] virtio_ring: fix complaint by sparse Message-ID: <20161122170346-mutt-send-email-mst@kernel.org> References: <1479793910-120188-1-git-send-email-arei.gonglei@huawei.com> <1479793910-120188-3-git-send-email-arei.gonglei@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1479793910-120188-3-git-send-email-arei.gonglei@huawei.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Tue, 22 Nov 2016 15:04:38 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2409 Lines: 53 On Tue, Nov 22, 2016 at 01:51:50PM +0800, Gonglei wrote: > # make C=2 CF="-D__CHECK_ENDIAN__" ./drivers/virtio/ > > drivers/virtio/virtio_ring.c:423:19: warning: incorrect type in assignment (different base types) > drivers/virtio/virtio_ring.c:423:19: expected unsigned int [unsigned] [assigned] i > drivers/virtio/virtio_ring.c:423:19: got restricted __virtio16 [usertype] next > drivers/virtio/virtio_ring.c:423:19: warning: incorrect type in assignment (different base types) > drivers/virtio/virtio_ring.c:423:19: expected unsigned int [unsigned] [assigned] i > drivers/virtio/virtio_ring.c:423:19: got restricted __virtio16 [usertype] next > drivers/virtio/virtio_ring.c:423:19: warning: incorrect type in assignment (different base types) > drivers/virtio/virtio_ring.c:423:19: expected unsigned int [unsigned] [assigned] i > drivers/virtio/virtio_ring.c:423:19: got restricted __virtio16 [usertype] next > drivers/virtio/virtio_ring.c:604:39: warning: incorrect type in initializer (different base types) > drivers/virtio/virtio_ring.c:604:39: expected unsigned short [unsigned] [usertype] nextflag > drivers/virtio/virtio_ring.c:604:39: got restricted __virtio16 > drivers/virtio/virtio_ring.c:612:33: warning: restricted __virtio16 degrades to integer > > Signed-off-by: Gonglei > --- > drivers/virtio/virtio_ring.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c > index 489bfc6..d2863c3 100644 > --- a/drivers/virtio/virtio_ring.c > +++ b/drivers/virtio/virtio_ring.c > @@ -420,7 +420,7 @@ static inline int virtqueue_add(struct virtqueue *_vq, > if (i == err_idx) > break; > vring_unmap_one(vq, &desc[i]); > - i = vq->vring.desc[i].next; > + i = virtio16_to_cpu(_vq->vdev, vq->vring.desc[i].next); > } > > vq->vq.num_free += total_sg; > @@ -601,7 +601,7 @@ bool virtqueue_kick(struct virtqueue *vq) > static void detach_buf(struct vring_virtqueue *vq, unsigned int head) > { > unsigned int i, j; > - u16 nextflag = cpu_to_virtio16(vq->vq.vdev, VRING_DESC_F_NEXT); > + __virtio16 nextflag = cpu_to_virtio16(vq->vq.vdev, VRING_DESC_F_NEXT); > > /* Clear data ptr. */ > vq->desc_state[head].data = NULL; > -- > 1.8.3.1 > Wow are you saying endian-ness is all wrong for the next field? How do things ever work then? -- MST