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

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Message-Id: <20100519212904N.fujita.tomonori@lab.ntt.co.jp>
Date:	Wed, 19 May 2010 21:26:49 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	dwmw2@...radead.org
Cc:	fujita.tomonori@....ntt.co.jp, 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 13:19:45 +0100
David Woodhouse <dwmw2@...radead.org> wrote:

> On Wed, 2010-05-19 at 21:02 +0900, FUJITA Tomonori wrote:
> > 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. 
> 
> Surely those architectures that have alignment constraints for DMA but
> which don't set ARCH_KMALLOC_MINALIGN are just buggy -- it _does_ mean
> that.

Well, I thought so but seems that there isn't such agreement:

http://kerneltrap.org/mailarchive/linux-kernel/2010/5/12/4568960

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