Fixes spurious system load spikes observed in /proc/loadavgrt, as described in:

  Bug 253103: /proc/loadavgrt issues weird results
  https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=253103Signed-off-by: Luis Claudio R. Goncalves <lgoncalv@redhat.com&gt;>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>