Avoid taking broadcast_lock in the idle path for systems where the
timer doesn't stop in C3.

[ tglx: Removed the stale label and added comment ]
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
Cc: Dave Kleikamp <dkleikamp@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: lenb@kernel.org
Cc: paulmck@us.ibm.com
Link: http://lkml.kernel.org/r/%3C20110504234806.GF2925%40one.firstfloor.org%3ESigned-off-by: NThomas Gleixner <tglx@linutronix.de>