On 22.11.2016 16:04, Michael S. Tsirkin wrote: > 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 <arei.gong...@huawei.com> >> --- >> 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; [...] > Wow are you saying endian-ness is all wrong for the next field? > How do things ever work then?
The above code is only in the error cleanup path (after the "unmap_release" label, introduced by commit 780bc7903), so it likely has never been exercised in the field. I think Gonlei's patch is right, there should be a virtio16_to_cpu() here. Thomas
