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Date: Fri, 12 Jun 2009 09:16:57 +0300 (EEST)
From: Pekka J Enberg <penberg@cs.helsinki.fi>
Subject: Re: slab: setup allocators earlier in the boot sequence
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To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>, Linux Kernel list <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>, mingo@elte.hu
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Hi Benjamin,

[ First of all, sorry for the breakage and thank you for looking into 
  this! ]

On Fri, 12 Jun 2009, Benjamin Herrenschmidt wrote:
> > I'll cook up a patch that defines a global bitmask of "forbidden" GFP
> > bits and see how things go.
> 
> >From ad87215e01b257ccc1af64aa9d5776ace580dea3 Mon Sep 17 00:00:00 2001
> From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Date: Fri, 12 Jun 2009 15:03:47 +1000
> Subject: [PATCH] Sanitize "gfp" flags during boot

OK, I am not sure we actually need that. The thing is, no one is allowed 
to use kmalloc() unless slab_is_available() returns true so we can just 
grep for the latter and do something like the following patch. Does that 
make powerpc boot nicely again? Ingo, I think this fixes the early irq 
screams you were having too.

There's some more in s390 architecture code and some drivers (!) but I 
left them out from this patch for now.

			Pekka