Re: add a new dma_alloc_noncontiguous API v3

[Christoph Hellwig]

Any comments?  Especially on the uvcvideo conversion?

On Mon, Mar 01, 2021 at 09:52:30AM +0100, Christoph Hellwig wrote:
> Hi all,
> 
> this series adds the new noncontiguous DMA allocation API requested by
> various media driver maintainers.
> 
> Changes since v2:
>  - rebased to Linux 5.12-rc1
>  - dropped one already merged patch
>  - pass an attrs argument to dma_alloc_noncontigous
>  - clarify the dma_vmap_noncontiguous documentation a bit
>  - fix double assignments in uvcvideo
> 
> Changes since v1:
>  - document that flush_kernel_vmap_range and invalidate_kernel_vmap_range
>    must be called once an allocation is mapped into KVA
>  - add dma-debug support
>  - remove the separate dma_handle argument, and instead create fully formed
>    DMA mapped scatterlists
>  - use a directional allocation in uvcvideo
>  - call invalidate_kernel_vmap_range from uvcvideo
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