linux-kernel - Re: [PATCH v5 5/8] vhost: introduce vhost_is_little

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Date:	Thu, 23 Apr 2015 21:05:02 +0200
From:	Thomas Huth <thuth@...hat.com>
To:	Greg Kurz <gkurz@...ux.vnet.ibm.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v5 5/8] vhost: introduce vhost_is_little_endian() helper

On Thu, 23 Apr 2015 17:27:05 +0200
Greg Kurz <gkurz@...ux.vnet.ibm.com> wrote:

> Signed-off-by: Greg Kurz <gkurz@...ux.vnet.ibm.com>
> ---
>  drivers/vhost/vhost.h |   17 +++++++++++------
>  1 file changed, 11 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
> index 8c1c792..6a49960 100644
> --- a/drivers/vhost/vhost.h
> +++ b/drivers/vhost/vhost.h
> @@ -173,34 +173,39 @@ static inline bool vhost_has_feature(struct vhost_virtqueue *vq, int bit)
>  	return vq->acked_features & (1ULL << bit);
>  }
>  
> +static inline bool vhost_is_little_endian(struct vhost_virtqueue *vq)
> +{
> +	return vhost_has_feature(vq, VIRTIO_F_VERSION_1);
> +}
> +
>  /* Memory accessors */
>  static inline u16 vhost16_to_cpu(struct vhost_virtqueue *vq, __virtio16 val)
>  {
> -	return __virtio16_to_cpu(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val);
> +	return __virtio16_to_cpu(vhost_is_little_endian(vq), val);
>  }
>  
>  static inline __virtio16 cpu_to_vhost16(struct vhost_virtqueue *vq, u16 val)
>  {
> -	return __cpu_to_virtio16(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val);
> +	return __cpu_to_virtio16(vhost_is_little_endian(vq), val);
>  }
>  
>  static inline u32 vhost32_to_cpu(struct vhost_virtqueue *vq, __virtio32 val)
>  {
> -	return __virtio32_to_cpu(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val);
> +	return __virtio32_to_cpu(vhost_is_little_endian(vq), val);
>  }
>  
>  static inline __virtio32 cpu_to_vhost32(struct vhost_virtqueue *vq, u32 val)
>  {
> -	return __cpu_to_virtio32(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val);
> +	return __cpu_to_virtio32(vhost_is_little_endian(vq), val);
>  }
>  
>  static inline u64 vhost64_to_cpu(struct vhost_virtqueue *vq, __virtio64 val)
>  {
> -	return __virtio64_to_cpu(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val);
> +	return __virtio64_to_cpu(vhost_is_little_endian(vq), val);
>  }
>  
>  static inline __virtio64 cpu_to_vhost64(struct vhost_virtqueue *vq, u64 val)
>  {
> -	return __cpu_to_virtio64(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val);
> +	return __cpu_to_virtio64(vhost_is_little_endian(vq), val);
>  }
>  #endif

Reviewed-by: Thomas Huth <thuth@...hat.com>
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