Re: add a new dma_alloc_noncontiguous API v2

[Christoph Hellwig]

Any comments?

On Tue, Feb 02, 2021 at 10:51:03AM +0100, Christoph Hellwig wrote:
> Hi all,
> 
> this series adds the new noncontiguous DMA allocation API requested by
> various media driver maintainers.
> 
> 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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