linux-kernel - [PATCH -mm 6/6] xtensa: set ARCH_KMALLOC

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Message-Id: <1274325703-11092-7-git-send-email-fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 20 May 2010 12:21:43 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Cc:	davem@...emloft.net, dwmw2@...radead.org,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Chris Zankel <chris@...kel.net>, stable@...nel.org
Subject: [PATCH -mm 6/6] xtensa: set ARCH_KMALLOC_MINALIGN

Architectures that handle DMA-non-coherent memory need to set
ARCH_KMALLOC_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: Chris Zankel <chris@...kel.net>
Cc: stable@...nel.org
---
 arch/xtensa/include/asm/cache.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/xtensa/include/asm/cache.h b/arch/xtensa/include/asm/cache.h
index f04c989..ed8cd3c 100644
--- a/arch/xtensa/include/asm/cache.h
+++ b/arch/xtensa/include/asm/cache.h
@@ -29,5 +29,6 @@
 # define CACHE_WAY_SIZE ICACHE_WAY_SIZE
 #endif
 
+#define ARCH_KMALLOC_MINALIGN	L1_CACHE_BYTES
 
 #endif	/* _XTENSA_CACHE_H */
-- 
1.6.5

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