Re: [PATCH v3 5/6] media: uvcvideo: Use dma_alloc_noncontiguos API

[Christoph Hellwig]

On Tue, Dec 01, 2020 at 12:36:58PM +0900, Sergey Senozhatsky wrote:
> Not that I have any sound experience in this area, but the helper
> probably won't hurt. Do you also plan to add vmap() to that helper
> or dma_alloc_noncontiguous()/sg_alloc_table_from_pages() only?

Yes, I think adding the vmap is useful, and it probably makes sense
to do that unconditionally.  I'd also include the fallback to
dma_alloc_pages when the noncontig version isn't supported in the
helper.