xtensa: set ARCH_KMALLOC_MINALIGN
authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Mon, 24 May 2010 21:31:45 +0000 (14:31 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 25 May 2010 15:06:56 +0000 (08:06 -0700)
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>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/xtensa/include/asm/cache.h

index f04c9891142fa7a5090d966ac4779b0af419ebca..ed8cd3cbd4993de9619f1e6db12af3c26b166c9b 100644 (file)
@@ -29,5 +29,6 @@
 # define CACHE_WAY_SIZE ICACHE_WAY_SIZE
 #endif
 
+#define ARCH_KMALLOC_MINALIGN  L1_CACHE_BYTES
 
 #endif /* _XTENSA_CACHE_H */