Subject: Re: [RFC 3/3] virtio_ring: use new vring flags

From: "Michael S. Tsirkin" <[email-masked]>
Date: Fri, 7 Dec 2018 13:10:48 -0500

On Fri, Dec 07, 2018 at 04:48:42PM +0800, Tiwei Bie wrote:
> Switch to using the _SPLIT_ and _PACKED_ variants of vring flags
> in split ring and packed ring respectively.
> 
> Signed-off-by: Tiwei Bie <[email-masked]>
> ---
> @@ -502,7 +505,8 @@ static inline int virtqueue_add_split(struct virtqueue *_vq,
>  		}
>  	}
>  	/* Last one doesn't continue. */
> -	desc[prev].flags &= cpu_to_virtio16(_vq->vdev, ~VRING_DESC_F_NEXT);
> +	desc[prev].flags &= cpu_to_virtio16(_vq->vdev,
> +				(u16)~BIT(VRING_SPLIT_DESC_F_NEXT));
>  
>  	if (indirect) {
>  		/* Now that the indirect table is filled in, map it. */

I kind of dislike it that this forces use of a cast here.
Kind of makes it more fragile. Let's use a temporary instead?

> -- 
> 2.17.1