From: Christoph Lameter <cl@linux.com>
Date: Tue, 2 Jul 2013 19:12:10 +0000 (-0700)
Subject: slab: fix init_lock_keys
X-Git-Tag: v3.11-rc1~1^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0f8f8094d28eb53368ac09186ea6b3a324cc7d44;p=pandora-kernel.git

slab: fix init_lock_keys

Some architectures (e.g. powerpc built with CONFIG_PPC_256K_PAGES=y
CONFIG_FORCE_MAX_ZONEORDER=11) get PAGE_SHIFT + MAX_ORDER > 26.

In 3.10 kernels, CONFIG_LOCKDEP=y with PAGE_SHIFT + MAX_ORDER > 26 makes
init_lock_keys() dereference beyond kmalloc_caches[26].
This leads to an unbootable system (kernel panic at initializing SLAB)
if one of kmalloc_caches[26...PAGE_SHIFT+MAX_ORDER-1] is not NULL.

Fix this by making sure that init_lock_keys() does not dereference beyond
kmalloc_caches[26] arrays.

Signed-off-by: Christoph Lameter <cl@linux.com>
Reported-by: Tetsuo Handa <penguin-kernel@I-Love.SAKURA.ne.jp>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: <stable@vger.kernel.org>	[3.10.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
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