linux-kernel - Re: [BUG] SLOB breaks Crypto

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Message-Id: <20100519210506U.fujita.tomonori@lab.ntt.co.jp>
Date:	Wed, 19 May 2010 21:02:49 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	dwmw2@...radead.org
Cc:	geert@...ux-m68k.org, herbert@...dor.hengli.com.au,
	davem@...emloft.net, penberg@...helsinki.fi, mpm@...enic.com,
	ken@...elabs.ch, michael-dev@...i-braun.de,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	anemo@....ocn.ne.jp
Subject: Re: [BUG] SLOB breaks Crypto

On Wed, 19 May 2010 12:40:36 +0100
David Woodhouse <dwmw2@...radead.org> wrote:

> On Wed, 2010-05-19 at 13:32 +0200, Geert Uytterhoeven wrote:
> > Instead of having (different) defaults in sl[aou]b, perhaps we should
> > just remove the defaults completely, to ensure all architectures set
> > ARCH_SLAB_MINALIGN to the correct value? 
> 
> What is 'correct'? The architecture sets it to the minimum value that it
> can cope with, according to its own alignment constraints (and DMA/cache
> constraints, in the case of ARCH_KMALLOC_MINALIGN).

IIRC, not all the architectures do that; ARCH_KMALLOC_MINALIGN doesn't
mean "DMA-safe" alignment currently.
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