From: Christoph Lameter <cl@linux.com>
Date: Thu, 5 May 2011 20:23:54 +0000 (-0500)
Subject: slub: Remove CONFIG_CMPXCHG_LOCAL ifdeffery
X-Git-Tag: v3.0-rc1~341^2^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1759415e630e5db0dd2390df9f94892cbfb9a8a2;p=pandora-kernel.git

slub: Remove CONFIG_CMPXCHG_LOCAL ifdeffery

Remove the #ifdefs. This means that the irqsafe_cpu_cmpxchg_double() is used
everywhere.

There may be performance implications since:

A. We now have to manage a transaction ID for all arches

B. The interrupt holdoff for arches not supporting CONFIG_CMPXCHG_LOCAL is reduced
to a very short irqoff section.

There are no multiple irqoff/irqon sequences as a result of this change. Even in the fallback
case we only have to do one disable and enable like before.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
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