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From: FUJITA Tomonori on 8 Jul 2010 03:10
Architectures that handle DMA-non-coherent memory need to set
ARCH_DMA_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: Kyle McMartin <kyle(a)mcmartin.ca>
Cc: Helge Deller <deller(a)gmx.de>
Cc: James E.J. Bottomley <jejb(a)parisc-linux.org>
---
arch/parisc/include/asm/cache.h | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/parisc/include/asm/cache.h b/arch/parisc/include/asm/cache.h
index 45effe6..039880e 100644
--- a/arch/parisc/include/asm/cache.h
+++ b/arch/parisc/include/asm/cache.h
@@ -28,6 +28,8 @@

#define SMP_CACHE_BYTES L1_CACHE_BYTES

+#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
+
#define __read_mostly __attribute__((__section__(".data..read_mostly")))

void parisc_cache_init(void); /* initializes cache-flushing */
--
1.6.5

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Prev: [PATCH -mm 0/3] unify dma_get_cache_alignment implementations
Next: [PATCH -mm 1/3] rename ARCH_KMALLOC_MINALIGN to ARCH_DMA_MINALIGN