linux-kernel - Re: [patch] slab: always follow arch requested alignments

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Message-ID: <Pine.LNX.4.58.0607261430520.17986@sbz-30.cs.Helsinki.FI>
Date:	Wed, 26 Jul 2006 14:32:51 +0300 (EEST)
From:	Pekka J Enberg <penberg@...Helsinki.FI>
To:	Christoph Lameter <clameter@....com>
cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: [patch] slab: always follow arch requested alignments

On Wed, 26 Jul 2006, Pekka Enberg wrote:
> > This is the bit I missed, sorry. I thought that the s390 hardware
> > mandates 8 byte alignment, but it really doesn't. So you're absolutely
> > right, you don't need to set ARCH_SLAB_MINALIGN and the alignment
> > calculation in slab is indeed broken for both, architecture and caller
> > mandated alignments.

On Wed, 26 Jul 2006, Christoph Lameter wrote:
> Well that is a bit far reaching. What is broken is that SLAB_RED_ZONE and
> SLAB_STORE_USER ignore any given alignment. If you want to fix that then 
> you need to modify how both debugging methods work.

Not sure I understand what you mean. Isn't it enough that we disable 
debugging if architecture or caller mandated alignment is greater than 
BYTES_PER_WORD?

				Pekka 
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