From: Christoph Hellwig <hch@lst•de>
To: iommu@lists•linux-foundation.org
Cc: Marek Szyprowski <m.szyprowski@samsung•com>,
Robin Murphy <robin.murphy@arm•com>,
Michal Simek <monstr@monstr•eu>,
David Howells <dhowells@redhat•com>,
Guan Xuetao <gxt@mprc•pku.edu.cn>,
Chris Zankel <chris@zankel•net>,
Max Filippov <jcmvbkbc@gmail•com>,
x86@kernel•org, linux-mips@linux-mips•org,
linux-ia64@vger•kernel.org, linuxppc-dev@lists•ozlabs.org,
linux-xtensa@linux-xtensa•org, linux-sh@vger•kernel.org,
linux-kernel@vger•kernel.org
Subject: [PATCH 04/11] ia64: make dma_cache_sync a no-op
Date: Tue, 3 Oct 2017 12:43:04 +0200 [thread overview]
Message-ID: <20171003104311.10058-5-hch@lst.de> (raw)
In-Reply-To: <20171003104311.10058-1-hch@lst.de>
ia64 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/ia64/include/asm/dma-mapping.h | 5 -----
1 file changed, 5 deletions(-)
diff --git a/arch/ia64/include/asm/dma-mapping.h b/arch/ia64/include/asm/dma-mapping.h
index 3ce5ab4339f3..99dfc1aa9d3c 100644
--- a/arch/ia64/include/asm/dma-mapping.h
+++ b/arch/ia64/include/asm/dma-mapping.h
@@ -48,11 +48,6 @@ static inline void
dma_cache_sync (struct device *dev, void *vaddr, size_t size,
enum dma_data_direction dir)
{
- /*
- * IA-64 is cache-coherent, so this is mostly a no-op. However, we do need to
- * ensure that dma_cache_sync() enforces order, hence the mb().
- */
- mb();
}
#endif /* _ASM_IA64_DMA_MAPPING_H */
--
2.14.1
next prev parent reply other threads:[~2017-10-03 10:43 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-03 10:43 refactor dma_cache_sync V2 Christoph Hellwig
2017-10-03 10:43 ` [PATCH 01/11] floppy: consolidate the dummy fd_cacheflush definition Christoph Hellwig
2017-10-03 10:43 ` [PATCH 02/11] x86: make dma_cache_sync a no-op Christoph Hellwig
2017-10-03 16:02 ` David Laight
2017-10-03 20:27 ` Thomas Gleixner
2017-10-03 10:43 ` [PATCH 03/11] frv: " Christoph Hellwig
2017-10-03 10:43 ` Christoph Hellwig [this message]
2017-10-04 8:59 ` [PATCH 04/11] ia64: " David Laight
2017-10-04 9:06 ` 'Christoph Hellwig'
2017-10-03 10:43 ` [PATCH 05/11] microblaze: " Christoph Hellwig
2017-10-03 10:43 ` [PATCH 06/11] mn10300: " Christoph Hellwig
2017-10-03 10:43 ` [PATCH 07/11] powerpc: " Christoph Hellwig
2017-10-03 11:24 ` Christophe LEROY
2017-10-03 11:43 ` Robin Murphy
2017-10-03 11:43 ` Christoph Hellwig
2017-10-04 8:29 ` Christophe LEROY
2017-10-03 10:43 ` [PATCH 08/11] unicore32: " Christoph Hellwig
2017-10-03 10:43 ` [PATCH 09/11] xtensa: " Christoph Hellwig
2017-10-03 10:43 ` [PATCH 10/11] sh: " Christoph Hellwig
2017-10-03 10:43 ` [PATCH 11/11] dma-mapping: turn dma_cache_sync into a dma_map_ops method Christoph Hellwig
2017-10-03 11:49 ` refactor dma_cache_sync V2 Robin Murphy
2017-10-16 12:44 ` Christoph Hellwig
2017-10-19 15:02 ` Christoph Hellwig
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