linux-kernel - Re: [PATCH v7 16/46] virtio

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Message-ID: <20141201091641.3085e682@thinkpad-w530>
Date:	Mon, 1 Dec 2014 09:16:41 +0100
From:	David Hildenbrand <dahi@...ux.vnet.ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	cornelia.huck@...ibm.com, rusty@....ibm.com, nab@...ux-iscsi.org,
	pbonzini@...hat.com, thuth@...ux.vnet.ibm.com,
	Rusty Russell <rusty@...tcorp.com.au>,
	virtualization@...ts.linux-foundation.org,
	linux-api@...r.kernel.org
Subject: Re: [PATCH v7 16/46] virtio_blk: v1.0 support

> Based on patch by Cornelia Huck.
> 
> Note: for consistency, and to avoid sparse errors,
>       convert all fields, even those no longer in use
>       for virtio v1.0.
> 
> Signed-off-by: Cornelia Huck <cornelia.huck@...ibm.com>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
...
> 
> -static unsigned int features[] = {
> +static unsigned int features_legacy[] = {
>  	VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
>  	VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_SCSI,
>  	VIRTIO_BLK_F_WCE, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
>  	VIRTIO_BLK_F_MQ,
> +}
> +;
> +static unsigned int features[] = {
> +	VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
> +	VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
> +	VIRTIO_BLK_F_TOPOLOGY,
> +	VIRTIO_BLK_F_MQ,
> +	VIRTIO_F_VERSION_1,

We can fit this into less lines, like done for features_legacy.

I was asking myself if we could do the conversion of the statical values
somehow upfront, to reduce the patch size and avoid cpu_to_virtio.* at those
places.

Otherwise looks good to me.


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