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Date: Fri, 16 May 2008 09:21:09 +0900
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Andy Whitcroft <apw@shadowen.org>
Subject: Re: [PATCH 2/3] slub: record page flag overlays explicitly
Cc: kosaki.motohiro@jp.fujitsu.com, linux-mm@kvack.org,
       Andrew Morton <akpm@osdl.org>, Christoph Lameter <clameter@sgi.com>,
       KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
       Rik van Riel <riel@redhat.com>, Jeremy Fitzhardinge <jeremy@goop.org>,
       linux-kernel@vger.kernel.org
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> SLUB reuses two page bits for internal purposes, it overlays PG_active
> and PG_error.  This is hidden away in slub.c.  Document these overlays
> explicitly in the main page-flags enum along with all the others.
> 
> Signed-off-by: Andy Whitcroft <apw@shadowen.org>

Agreed.
I like your approach :)