linux-kernel - Re: [PATCH -tip] mm: introduce __GFP

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Date:	Mon, 4 May 2009 11:53:35 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	gorcunov@...il.com, mingo@...e.hu, mel@....ul.ie,
	linux-kernel@...r.kernel.org, penberg@...helsinki.fi,
	riel@...hat.com, rientjes@...gle.com, xemul@...nvz.org
Subject: Re: [PATCH -tip] mm: introduce __GFP_PANIC modifier

On Mon, 4 May 2009 09:47:45 -0400 (EDT)
Christoph Lameter <cl@...ux.com> wrote:

> 
> 
> Could you try to avoid consuming another GFP flag? __GFP_BITS_SHIFT is
> used elsewhere to figure out where to put miscellanous flags into the gfp
> mask. This is pretty limited right now and so the patch does work.

hm, yes, there are seven bits left.

afaict bit 3 (0x08) is unused?

Is __GFP_PANIC very useful?  I expect it will permit a very small code
saving at a relatively small number of callsites, all of which are
__init anyway?

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