linux-kernel - Re: [PATCH 2/3] slub: record page flag overlays explicitly

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Message-ID: <Pine.LNX.4.64.0805151028130.18354@schroedinger.engr.sgi.com>
Date:	Thu, 15 May 2008 10:29:16 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andy Whitcroft <apw@...dowen.org>
cc:	linux-mm@...ck.org, Andrew Morton <akpm@...l.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] slub: record page flag overlays explicitly

On Thu, 15 May 2008, Andy Whitcroft wrote:
 
> 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.

Hmmm.. Add the definitions also to page-flags.h?

SLABFLAG(Frozen, PG_active)
SLABFLAG(Debug, PG_error)
?

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