Commit 562437a8 authored Aug 27, 2017 by Christoph Hellwig

ia64: make dma_cache_sync a no-op



ia64 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: Robin Murphy <robin.murphy@arm.com>

parent 9d254b8e

arch/ia64/include/asm/dma-mapping.h

+0 −5

Original line number	Diff line number	Diff line
		@@ -48,11 +48,6 @@ static inline void
		dma_cache_sync (struct device dev, void vaddr, size_t size,
		enum dma_data_direction dir)
		{
		/*
		* IA-64 is cache-coherent, so this is mostly a no-op. However, we do need to
		* ensure that dma_cache_sync() enforces order, hence the mb().
		*/
		mb();
		}

		#endif /* _ASM_IA64_DMA_MAPPING_H */