From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Date: Mon, 24 May 2010 21:31:45 +0000 (-0700)
Subject: xtensa: set ARCH_KMALLOC_MINALIGN
X-Git-Tag: v2.6.34.1~100
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=91cb08a13af6c60db3349e533472cc9fce2c11c8;p=thirdparty%2Fkernel%2Fstable.git

xtensa: set ARCH_KMALLOC_MINALIGN

commit 498900fc9cd1adbad1ba6b55ed9d8f2f5d655ca3 upstream.

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@lab.ntt.co.jp>
Cc: Chris Zankel <chris@zankel.net>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/arch/xtensa/include/asm/cache.h b/arch/xtensa/include/asm/cache.h
index f04c9891142fa..ed8cd3cbd4993 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 */