linux-kernel - Re: [PATCH] virtio_ring: remove unused code in virtqueue

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Date:	Fri, 13 Apr 2012 09:45:44 +0100
From:	Stefan Hajnoczi <stefanha@...ux.vnet.ibm.com>
To:	zwu.kernel@...il.com
Cc:	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: Re: [PATCH] virtio_ring: remove unused code in virtqueue_notify()

On Fri, Apr 13, 2012 at 11:26:03AM +0800, zwu.kernel@...il.com wrote:
> From: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
> 
> Signed-off-by: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
> ---
>  drivers/virtio/virtio_ring.c |    2 --
>  1 files changed, 0 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 5aa43c3..c6a54e6 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -343,8 +343,6 @@ EXPORT_SYMBOL_GPL(virtqueue_kick_prepare);
>   */
>  void virtqueue_notify(struct virtqueue *_vq)
>  {
> -	struct vring_virtqueue *vq = to_vvq(_vq);
> -
>  	/* Prod other side to tell it about changes. */
>  	vq->notify(_vq);

vq->notify() uses 'vq'.  How does this work?

Stefan

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