x86: make dma_cache_sync a no-op

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x86 does not implement DMA_ATTR_NON_CONSISTENT allocations, so it doesn't
make any sense to do any work in dma_cache_sync given that it must be a
no-op when dma_alloc_attrs returns coherent memory.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>

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Christoph Hellwig 2017-08-27 10:06:22 +02:00

parent acfef4f126

commit 95e499fc7f

1 changed files with 0 additions and 1 deletions

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arch/x86/include/asm/dma-mapping.h

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