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Commit 95e499fc authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

x86: make dma_cache_sync a no-op 



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: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarRobin Murphy <robin.murphy@arm.com>
parent acfef4f1

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

+0 −1
Original line number Original line Diff line number Diff line
@@ -71,7 +71,6 @@ static inline void 
dma_cache_sync(struct device *dev, void *vaddr, size_t size,

dma_cache_sync(struct device *dev, void *vaddr, size_t size,

	enum dma_data_direction dir)

	enum dma_data_direction dir)

{

{

	flush_write_buffers();

}

}





static inline unsigned long dma_alloc_coherent_mask(struct device *dev,

static inline unsigned long dma_alloc_coherent_mask(struct device *dev,