linux-kernel - Re: [PATCH 1/3] page-flags: record page flag overlays explicitly

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Message-ID: <Pine.LNX.4.64.0805151026410.18354@schroedinger.engr.sgi.com>
Date:	Thu, 15 May 2008 10:28:00 -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 1/3] page-flags: record page flag overlays explicitly

On Thu, 15 May 2008, Andy Whitcroft wrote:

> Now that we have a single enum to generate the bit orders it makes sense
> to express overlays in the same place.  So create per use aliases for
> this bit in the main page-flags enum and use those in the accessors.

Well I thought it would be better to have the overlays defined when the 
PAGEFLAGS_xx macro is used. If that is done then every PG_xxx has a unique 
id. The aliasing is then only through PageXXXX() using a PG_yyy
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