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

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Message-ID: <Pine.LNX.4.64.0607260451250.4021@schroedinger.engr.sgi.com>
Date:	Wed, 26 Jul 2006 04:55:24 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Pekka J Enberg <penberg@...helsinki.fi>
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 J Enberg wrote:

> On Wed, 26 Jul 2006, Pekka J Enberg wrote:
> > Note that this will fix the kmem_cache_init() case too. If 
> > ARCH_KMALLOC_MINALIGN is greater than BYTES_PER_WORD, we'll disable 
> > debugging for those caches. It's obviously ok to have debugging for 
> > kmem_cache_init caches too if ARCH_KMALLOC_MINALIGN is greater than or 
> > equal to BYTES_PER_WORD.
> 
> Eh, meant "if ARCH_KMALLOC_MINALIGN is less than or equal to 
> BYTES_PER_WORD" obviously.

Your patch only deals with ARCH_SLAB_MINALIGN. kmem_cache_create() never 
uses ARCH_KMALLOC_MINALIGN only kmem_cache_init() does by passing it to 
kmem_cache_create.  ARCH_KMALLOC_MINALIGN will still be ignored.
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