Re: [PATCH 01/10] swiotlb: remove a pointless comment

[Robin Murphy]

On 08/10/18 09:02, Christoph Hellwig wrote:
> This comments describes an aspect of the map_sg interface that isn't
> even exploited by swiotlb.

Reviewed-by: Robin Murphy <robin.murphy@xxxxxxx>

> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
>   kernel/dma/swiotlb.c | 6 ------
>   1 file changed, 6 deletions(-)
>
> diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
> index 4f8a6dbf0b60..9062b14bc7f4 100644
> --- a/kernel/dma/swiotlb.c
> +++ b/kernel/dma/swiotlb.c
> @@ -925,12 +925,6 @@ swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
>    * appropriate dma address and length.  They are obtained via
>    * sg_dma_{address,length}(SG).
>    *
> - * NOTE: An implementation may be able to use a smaller number of
> - *       DMA address/length pairs than there are SG table elements.
> - *       (for example via virtual mapping capabilities)
> - *       The routine returns the number of addr/length pairs actually
> - *       used, at most nents.
> - *
>    * Device ownership issues as mentioned above for swiotlb_map_page are the
>    * same here.
>    */