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Date: Tue, 4 Mar 2008 12:01:29 -0800 (PST)
From: Christoph Lameter <clameter@sgi.com>
To: Pekka Enberg <penberg@cs.helsinki.fi>
Subject: Re: [BUG] 2.6.25-rc3-mm1 kernel panic while bootup on powerpc ()
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Cc: linux-mm@kvack.org, Mel Gorman <mel@csn.ul.ie>,
	Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>, linuxppc-dev@ozlabs.org,
	Andrew Morton <akpm@linux-foundation.org>
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On Tue, 4 Mar 2008, Pekka Enberg wrote:

> >  > >> [c000000009edf5f0] [c0000000000b56e4] .__alloc_pages_internal+0xf8/0x470
> >  > >> [c000000009edf6e0] [c0000000000e0458] .kmem_getpages+0x8c/0x194
> >  > >> [c000000009edf770] [c0000000000e1050] .fallback_alloc+0x194/0x254
> >  > >> [c000000009edf820] [c0000000000e14b0] .kmem_cache_alloc+0xd8/0x144

Ahh! This is SLAB. slub does not suffer this problem since new_slab() 
masks the bits correctly.

So we need to fix SLAB.