Re: [patch 4/4] change slab poison pattern

[Pekka Enberg]

Hi,

On Mon, 2006-04-24 at 16:33 +0800, Akinobu Mita wrote:
> kref debugging cannot detect kref_put() with unreferenced object,
> when the structure including kref is allocated by slab
> and slab debugging config is enabled.
> 
> Because use-after-free poisoning make kref counter signed value.
> So this patch prevents it by changing poisoning pattern.

Then why not check against POISON_INUSE when CONFIG_SLAB_DEBUG in the
kref debugging code? I would prefer you didn't change the slab constants
(they're well known by everyone now) but if you must, at least stick a
big fat comment there.

			Pekka

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