Re: [PATCH] xtensa: implement arch_dma_coherent_to_pfn

[Christoph Hellwig]

On Tue, Oct 15, 2019 at 02:25:26PM -0700, Max Filippov wrote:
> Add trivial implementation for arch_dma_coherent_to_pfn.
> This change enables communication with PCI ALSA devices through mmapped
> buffers.

This looks fine, although I'd much rather convert xtensa to the
generic DMA remap / uncached segment support.

Do you want this fix for 5.4?  If so please queue it up ASAP so that
I can do the proper thing for 5.5.  If you don't need it that urgent
I'd rather go straight to the generic code.