[095/200] mn10300: set ARCH_KMALLOC_MINALIGN

Greg KH
2010-07-01T21:48:31Z

2.6.34-stable review patch. If anyone has any objections, please let me know.

------------------

From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

commit 6cdafaae41d52e6ef9a5c5be23602ef083e4d0f9 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>
Acked-by: David Howells <dhowells@redhat.com>
Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
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>

---
arch/mn10300/include/asm/cache.h | 2 ++
1 file changed, 2 insertions(+)

--- a/arch/mn10300/include/asm/cache.h
+++ b/arch/mn10300/include/asm/cache.h
@@ -21,6 +21,8 @@
#define L1_CACHE_DISPARITY L1_CACHE_NENTRIES * L1_CACHE_BYTES
#endif

+#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
+
/* data cache purge registers
* - read from the register to unconditionally purge that cache line
* - write address & 0xffffff00 to conditionally purge that cache line