From: "Anil" <anil.s.keshavamurthy@intel.com>

We don't need lock_cpu_hotplug()/unlock_cpu_hotplug for singlethreaded
workqueues.
Signed-off-by: Anil Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>