* [patch 157/177] dma-mapping: parisc: set ARCH_DMA_MINALIGN
@ 2010-08-11 1:03 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2010-08-11 1:03 UTC (permalink / raw)
To: torvalds; +Cc: akpm, fujita.tomonori, deller, jejb, kyle, linux-arch
From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Architectures that handle DMA-non-coherent memory need to set
ARCH_DMA_MINALIGN to make sure that kmalloc'ed buffer is DMA-safe: the
buffer doesn't share a cache with the others.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Helge Deller <deller@gmx.de>
Cc: James E.J. Bottomley <jejb@parisc-linux.org>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
arch/parisc/include/asm/cache.h | 2 ++
1 file changed, 2 insertions(+)
diff -puN arch/parisc/include/asm/cache.h~dma-mapping-parisc-set-arch_dma_minalign arch/parisc/include/asm/cache.h
--- a/arch/parisc/include/asm/cache.h~dma-mapping-parisc-set-arch_dma_minalign
+++ a/arch/parisc/include/asm/cache.h
@@ -28,6 +28,8 @@
#define SMP_CACHE_BYTES L1_CACHE_BYTES
+#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
+
#define __read_mostly __attribute__((__section__(".data..read_mostly")))
void parisc_cache_init(void); /* initializes cache-flushing */
_
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2010-08-11 1:03 [patch 157/177] dma-mapping: parisc: set ARCH_DMA_MINALIGN akpm
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