linux-kernel - Re: [RFC/PATCH 1/3] SLAB: Add PageSlab checking to ksize()

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Message-ID: <84144f020805220913g344baedaqb0996adecdadae99@mail.gmail.com>
Date:	Thu, 22 May 2008 19:13:56 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Matt Mackall" <mpm@...enic.com>
Cc:	"Paul Mundt" <lethal@...ux-sh.org>,
	"Christoph Lameter" <clameter@....com>,
	linux-kernel@...r.kernel.org, dhowells@...hat.com
Subject: Re: [RFC/PATCH 1/3] SLAB: Add PageSlab checking to ksize()

Hi Matt,

On Thu, May 22, 2008 at 6:01 PM, Matt Mackall <mpm@...enic.com> wrote:
> As I've said several times, ksize() on kmem_cache_alloced objects
> -cannot work- on SLOB. Calling ksize() on something returned by
> kmem_cache_alloc is a categorical error.

Well, it's a historical fact that ksize() worked for both kmalloc()
and kmem_cache_alloc() (see the kernedoc comment in mm/slab.c).
However, I think we should just look at getting rid of ksize()
altogether as it's only (ab)used by the nommu code and few call-sites
that open-code krealloc().

                       Pekka
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