RE: [PATCH 02/11] x86: make dma_cache_sync a no-op

2017-10-03 Thread Thomas Gleixner
On Tue, 3 Oct 2017, David Laight wrote: > From: Christoph Hellwig > > Sent: 03 October 2017 11:43 > > 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 coheren

RE: [PATCH 02/11] x86: make dma_cache_sync a no-op

2017-10-03 Thread David Laight
From: Christoph Hellwig > Sent: 03 October 2017 11:43 > 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. I believe it is just about possible to r

[PATCH 02/11] x86: make dma_cache_sync a no-op

2017-10-03 Thread Christoph Hellwig
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 Reviewed-by: Thomas Gleixner --- arch/x86/include/asm/dma-mappin