Re: [PATCH v2 1/4] dma-buf: add support for virtio exported objects

[Gerd Hoffmann <kraxel@redhat.com>]

On Mon, Mar 02, 2020 at 09:15:21PM +0900, David Stevens wrote:
> This change adds a new dma-buf operation that allows dma-bufs to be used
> by virtio drivers to share exported objects. The new operation allows
> the importing driver to query the exporting driver for the UUID which
> identifies the underlying exported object.
> 
> Signed-off-by: David Stevens <stevensd@chromium.org>
> ---
>  drivers/dma-buf/dma-buf.c | 14 ++++++++++++++
>  include/linux/dma-buf.h   | 22 ++++++++++++++++++++++
>  2 files changed, 36 insertions(+)
> 
> diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
> index d4097856c86b..a04632284ec2 100644
> --- a/drivers/dma-buf/dma-buf.c
> +++ b/drivers/dma-buf/dma-buf.c
> @@ -1158,6 +1158,20 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, void *vaddr)
>  }
>  EXPORT_SYMBOL_GPL(dma_buf_vunmap);
>  
> +#ifdef CONFIG_VIRTIO
> +int dma_buf_get_uuid(struct dma_buf *dmabuf, uuid_t *uuid)

Hmm, I think I would drop the #ifdef

cheers,
  Gerd