Re: [PATCH 04/12] x86: make dma_cache_sync a no-op
From: Thomas Gleixner <hidden>
Date: 2017-08-31 14:07:18
Also in:
linux-iommu, linux-mips, linux-sh, lkml
On Sun, 27 Aug 2017, Christoph Hellwig wrote:
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 <redacted>
quoted hunk ↗ jump to hunk
--- 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 398c79889f5c..04877267ad18 100644 --- a/arch/x86/include/asm/dma-mapping.h +++ b/arch/x86/include/asm/dma-mapping.h@@ -70,7 +70,6 @@ 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,-- 2.11.0