linux-kernel - Re: [PATCH] add __GFP_ZERO to GFP_LEVEL

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Message-Id: <20070724161247.ee1a2546.akpm@linux-foundation.org>
Date:	Tue, 24 Jul 2007 16:12:47 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mel Gorman <mel@...net.ie>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Daniel Phillips <phillips@...gle.com>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH] add __GFP_ZERO to GFP_LEVEL_MASK

On Tue, 24 Jul 2007 16:00:32 -0700 (PDT) Christoph Lameter <clameter@....com> wrote:

> On Tue, 24 Jul 2007, Andrew Morton wrote:
> 
> > I think I'll duck this for now.  Otherwise I have a suspicion that I'll
> > be the first person to run it and I'm too old for such excitement.
> 
> I always had the suspicion that you have some magical script 
> which will immediately tell you that a patch is not working ;-)

sort of a defensive crouch.

> Works fine on x86_64 (on top of the ctor cleanup patchset) and passes the 
> kernel build test but then there may be creatively designed drivers and 
> such that pass these flags to the slab allocators which will now BUG.

__GFP_COLD looks OK.

__GFP_COMP I'm not so sure about. 
drivers/char/drm/drm_pci.c:drm_pci_alloc() (and other places like infiniband)
pass it into dma_alloc_coherent() which some architectures implement via slab.  umm,
arch/arm/mm/consistent.c is one such.

__GFP_MOVABLE looks OK.

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