frv: set ARCH_KMALLOC_MINALIGN
FUJITA Tomonori [Mon, 24 May 2010 21:32:54 +0000 (14:32 -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>
Acked-by: David Howells <dhowells@redhat.com>
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/frv/include/asm/cache.h

index 2797163..7dc0f0f 100644 (file)
@@ -17,6 +17,8 @@
 #define L1_CACHE_SHIFT         (CONFIG_FRV_L1_CACHE_SHIFT)
 #define L1_CACHE_BYTES         (1 << L1_CACHE_SHIFT)
 
+#define ARCH_KMALLOC_MINALIGN  L1_CACHE_BYTES
+
 #define __cacheline_aligned    __attribute__((aligned(L1_CACHE_BYTES)))
 #define ____cacheline_aligned  __attribute__((aligned(L1_CACHE_BYTES)))