stable/for-linus-3.12-rc0-tag-two

 - Boot on ARM without using Xen unconditionally
 - On Xen ARM don't run cpuidle/cpufreq
 - Fix regression in balloon driver, preempt count warnings
 - Fixes to make PVHVM able to use pv ticketlock.
 - Revert Xen PVHVM disabling pv ticketlock (aka, re-enable pv ticketlocks)