linux-kernel - Re: [PATCH -next] slub: set PG

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Message-ID: <alpine.DEB.2.00.1202290922210.32268@router.home>
Date:	Wed, 29 Feb 2012 09:24:30 -0600 (CST)
From:	Christoph Lameter <cl@...two.org>
To:	Namhyung Kim <namhyung.kim@....com>
cc:	Pekka Enberg <penberg@...nel.org>, Matt Mackall <mpm@...enic.com>,
	Namhyung Kim <namhyung@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] slub: set PG_slab on all of slab pages

On Wed, 29 Feb 2012, Namhyung Kim wrote:

> Unlike SLAB, SLUB doesn't set PG_slab on tail pages, so if a user would
> call free_pages() incorrectly on a object in a tail page, she will get
> confused with the undefined result. Setting the flag would help her by
> emitting a warning on bad_page() in such a case.

NAK

You cannot free a tail page of a compound higher order page independently.
You must free the whole compound.

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