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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>
This commit is contained in:
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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@ -71,7 +71,6 @@ static inline void
dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction dir)
{
flush_write_buffers();
}
static inline unsigned long dma_alloc_coherent_mask(struct device *dev,