A more readable version, with a few differences:

 - don't check against the root domain, but instead check
   SD_LOAD_BALANCE

 - don't re-iterate the cpus already iterated on the previous SD

 - use rcu_read_lock() around the sd iteration
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Dinakar Guniguntala <dino@in.ibm.com>
Cc: John Stultz <johnstul@us.ibm.com>
Cc: Darren Hart <dvhltc@us.ibm.com>
Cc: John Kacur <jkacur@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>