linux-kernel - [PATCH -mm 3/3] parisc: set ARCH_DMA

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Message-Id: <1278572268-26146-4-git-send-email-fujita.tomonori@lab.ntt.co.jp>
Date:	Thu,  8 Jul 2010 15:57:48 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, fujita.tomonori@....ntt.co.jp,
	linux-arch@...r.kernel.org, Kyle McMartin <kyle@...artin.ca>,
	Helge Deller <deller@....de>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>
Subject: [PATCH -mm 3/3] parisc: set ARCH_DMA_MINALIGN

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@....ntt.co.jp>
Cc: Kyle McMartin <kyle@...artin.ca>
Cc: Helge Deller <deller@....de>
Cc: James E.J. Bottomley <jejb@...isc-linux.org>
---
 arch/parisc/include/asm/cache.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/parisc/include/asm/cache.h b/arch/parisc/include/asm/cache.h
index 45effe6..039880e 100644
--- a/arch/parisc/include/asm/cache.h
+++ b/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 */
-- 
1.6.5

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