On 30/04/2019 11:56, Christoph Hellwig wrote:
So while I really, really like this cleanup it turns out it isn't
actually safe for arm :( arm remaps the CMA allocation in place
instead of using a new mapping, which can be done because they don't
share PMDs with the kernel.
So we'll probably need a __dma_alloc_from_contiguous version with
an additional bool fallback argument - everyone but arms uses
dma_alloc_from_contiguous as in your patch, just arm will get the
non-fallback one.
Or we even just implement dma_{alloc,free}_contiguous() as a wrapper
around the existing APIs so that users can be thoroughly checked and
converted one-by-one.
Robin.
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