linux-kernel - Re: [RFC v4 5/5] virtio

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Message-ID: <20180516102159.GA11467@debian>
Date:   Wed, 16 May 2018 18:21:59 +0800
From:   Tiwei Bie <tiwei.bie@...el.com>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:     mst@...hat.com, jasowang@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        wexu@...hat.com, jfreimann@...hat.com
Subject: Re: [RFC v4 5/5] virtio_ring: enable packed ring

On Wed, May 16, 2018 at 01:15:48PM +0300, Sergei Shtylyov wrote:
> On 5/16/2018 11:37 AM, Tiwei Bie wrote:
> 
> > Signed-off-by: Tiwei Bie <tiwei.bie@...el.com>
> > ---
> >   drivers/virtio/virtio_ring.c | 2 ++
> >   1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> > index de3839f3621a..b158692263b0 100644
> > --- a/drivers/virtio/virtio_ring.c
> > +++ b/drivers/virtio/virtio_ring.c
> > @@ -1940,6 +1940,8 @@ void vring_transport_features(struct virtio_device *vdev)
> >   			break;
> >   		case VIRTIO_F_IOMMU_PLATFORM:
> >   			break;
> > +		case VIRTIO_F_RING_PACKED:
> > +			break;
> 
>    Why not just add this *case* under the previous *case*?

Do you mean fallthrough? Something like:

		case VIRTIO_F_IOMMU_PLATFORM:
		case VIRTIO_F_RING_PACKED:
			break;

Best regards,
Tiwei Bie

> 
> >    		default:
> >   			/* We don't understand this bit. */
> >   			__virtio_clear_bit(vdev, i);
> 
> MBR, Sergei