linux-kernel - Re: [PATCH 1/4] mm: Move ARCH_SLAB_MINALIGN and ARCH_KMALLOC_MINALIGN to <linux/slab

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Message-ID: <alpine.DEB.2.00.1005191444230.5729@router.home>
Date:	Wed, 19 May 2010 14:45:01 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
cc:	David Woodhouse <dwmw2@...radead.org>,
	Herbert Xu <herbert@...dor.hengli.com.au>,
	manfred@...orfullife.com, David Miller <davem@...emloft.net>,
	mpm@...enic.com, ken@...elabs.ch, geert@...ux-m68k.org,
	michael-dev@...i-braun.de, linux-kernel@...r.kernel.org,
	linux-crypto@...r.kernel.org, anemo@....ocn.ne.jp
Subject: Re: [PATCH 1/4] mm: Move ARCH_SLAB_MINALIGN and ARCH_KMALLOC_MINALIGN
 to <linux/slab_def.h>

On Wed, 19 May 2010, Pekka Enberg wrote:

> Christoph Lameter wrote:
> > Maybe we can consolidate that into slab.h so that the alignment is the
> > same for all allocators?
>
> But we don't want that for SLOB as discussed in the other thread. It really
> wants to be sizeof(unsigned long), not sizeof(unsigned long long).

__alignof__(unsigned long long)

SLOB needs to respect that as well otherwise objects are not aligned as
required by the compiler.

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