[PATCH 04/12] x86: make dma_cache_sync a no-op
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- To: iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
- Subject: [PATCH 04/12] x86: make dma_cache_sync a no-op
- From: Christoph Hellwig <hch@xxxxxx>
- Date: Sun, 27 Aug 2017 18:10:24 +0200
- Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, Michal Simek <monstr@xxxxxxxxx>, David Howells <dhowells@xxxxxxxxxx>, Guan Xuetao <gxt@xxxxxxxxxxxxxxx>, Chris Zankel <chris@xxxxxxxxxx>, Max Filippov <jcmvbkbc@xxxxxxxxx>, x86@xxxxxxxxxx, linux-mips@xxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-xtensa@xxxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Christoph Hellwig <hch@xxxxxx>
- In-reply-to: <20170827161032.22772-1-hch@lst.de>
- References: <20170827161032.22772-1-hch@lst.de>
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@xxxxxx
---
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
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