From: Chris Metcalf <cmetcalf@tilera.com>
Date: Thu, 2 Jun 2011 14:19:41 +0000 (-0400)
Subject: slub: always align cpu_slab to honor cmpxchg_double requirement
X-Git-Tag: v3.0-rc3~1^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d4d84fef6d0366b585b7de13527a0faeca84d9ce;p=pandora-kernel.git

slub: always align cpu_slab to honor cmpxchg_double requirement

On an architecture without CMPXCHG_LOCAL but with DEBUG_VM enabled,
the VM_BUG_ON() in __pcpu_double_call_return_bool() will cause an early
panic during boot unless we always align cpu_slab properly.

In principle we could remove the alignment-testing VM_BUG_ON() for
architectures that don't have CMPXCHG_LOCAL, but leaving it in means
that new code will tend not to break x86 even if it is introduced
on another platform, and it's low cost to require alignment.

Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---

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