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

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Message-ID: <AANLkTil7bciN2D_4cjROmONihRHQNpH3t_bJNSyz92UW@mail.gmail.com>
Date:	Thu, 20 May 2010 07:50:05 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	davem@...emloft.net, dwmw2@...radead.org
Subject: Re: [PATCH -mm 0/6] ARCH_KMALLOC_MINALIGN fixes

On Thu, May 20, 2010 at 6:21 AM, FUJITA Tomonori
<fujita.tomonori@....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@...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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