linux-kernel - [PATCH -mm 0/6] ARCH_KMALLOC

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Message-Id: <1274325703-11092-1-git-send-email-fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 20 May 2010 12:21:37 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Cc:	davem@...emloft.net, dwmw2@...radead.org
Subject: [PATCH -mm 0/6] ARCH_KMALLOC_MINALIGN fixes

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.

=
 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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