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From: FUJITA Tomonori on 19 May 2010 23:30
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(a)lab.ntt.co.jp>
Cc: David Howells <dhowells(a)redhat.com>
Cc: Koichi Yasutake <yasutake.koichi(a)jp.panasonic.com>
Cc: stable(a)kernel.org
---
arch/mn10300/include/asm/cache.h | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/mn10300/include/asm/cache.h b/arch/mn10300/include/asm/cache.h
index e03cfa2..6e2fe28 100644
--- 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
--
1.6.5

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Prev: acpi: video: fix acpi_backlight=video
Next: [PATCH -mm 6/6] xtensa: set ARCH_KMALLOC_MINALIGN