Messages in this thread Patch in this message | | | From | Christoph Hellwig <> | Subject | [PATCH 02/11] x86: make dma_cache_sync a no-op | Date | Tue, 3 Oct 2017 12:43:02 +0200 |
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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> --- arch/x86/include/asm/dma-mapping.h | 1 - 1 file changed, 1 deletion(-)
diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h index 1387dafdba2d..c6d3367be916 100644 --- a/arch/x86/include/asm/dma-mapping.h +++ b/arch/x86/include/asm/dma-mapping.h @@ -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, -- 2.14.1
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