diff mbox

[04/12] x86: make dma_cache_sync a no-op

Message ID 20170827161032.22772-5-hch@lst.de (mailing list archive)
State New, archived
Headers show

Commit Message

Christoph Hellwig Aug. 27, 2017, 4:10 p.m. UTC
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
---
 arch/x86/include/asm/dma-mapping.h | 1 -
 1 file changed, 1 deletion(-)

Comments

Thomas Gleixner Aug. 31, 2017, 2:06 p.m. UTC | #1
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 <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 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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diff mbox

Patch

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,