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

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Message-ID: <AANLkTikZyfxBjXdvNzuVT2N9XIyJmY6JDiKRMRtAykeC@mail.gmail.com>
Date:	Wed, 19 May 2010 13:50:52 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Herbert Xu <herbert@...dor.hengli.com.au>,
	David Miller <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, May 19, 2010 at 13:40, 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).
>
> Some architectures don't _have_ any minimum required alignment, so they
> have no need to set it. If the architecture _does_ specify a minimum,
> the allocators must honour it. Otherwise, they're free to do their own
> thing. And slob chooses to use a smaller alignment than slab and slub
> do, in accordance with its design and its raison d'être.

Currently 7 out of 20+ architectures set it.
Any bets on how many are missing, but should set it?

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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