Re: [PATCH v1 1/2] mm: cma: introduce cma_release_nowait()

[Christoph Hellwig]

Btw, I think we also need to use this nonblocking version from
dma_free_contiguous.  dma_free* is defined to not block.  In practice
callers mostly care if they also did GFP_ATOMIC allocations, which
don't dip into CMA, but I think we do have a problem.