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From: Pekka Enberg on 20 May 2010 01:00
On Thu, May 20, 2010 at 6:21 AM, FUJITA Tomonori
<fujita.tomonori(a)lab.ntt.co.jp> wrote:
> As DMA-API-HOWTO says, kmalloc'ed buffer must be DMA-safe. Drivers and
> subsystems depend on it.
>
> So architectures that handle DMA-non-coherent memory need to set
> ARCH_KMALLOC_MINALIGN: the kmalloc'ed buffer doesn't share a cache
> with the others. Otherwise, we hit memory corruption due to DMA.
>
> I had a quick look at all the architectures. Seems that some
> architectures that need to set ARCH_KMALLOC_MINALIGN don't do.

Acked-by: Pekka Enberg <penberg(a)cs.helsinki.fi>

for the whole series.

>
> =
> �arch/blackfin/include/asm/cache.h | � �2 ++
> �arch/frv/include/asm/cache.h � � �| � �2 ++
> �arch/m68k/include/asm/cache.h � � | � �2 ++
> �arch/mn10300/include/asm/cache.h �| � �2 ++
> �arch/parisc/include/asm/cache.h � | � �2 ++
> �arch/xtensa/include/asm/cache.h � | � �1 +
> �6 files changed, 11 insertions(+), 0 deletions(-)
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