dma-mapping: add a dma_alloc_need_uncached helper

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Check if we need to allocate uncached memory for a device given the
allocation flags.  Switch over the uncached segment check to this helper
to deal with architectures that do not support the dma_cache_sync
operation and thus should not returned cacheable memory for
DMA_ATTR_NON_CONSISTENT allocations.

Signed-off-by: Christoph Hellwig <hch@lst.de>

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This commit is contained in:

Christoph Hellwig 2019-06-14 16:06:10 +02:00

parent 961729bfc7

commit 4b85faed21

2 changed files with 16 additions and 2 deletions

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14

include/linux/dma-noncoherent.h

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4

kernel/dma/direct.c

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