Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck...

Pull RCU fix from Paul McKenney:

" This pull request is for an RCU change that permits waiting for grace
  periods started by CPUs late in the process of going offline.  Lack of
  this capability is causing failures:

    http://lkml.kernel.org/r/db9c91f6-1b17-6136-84f0-03c3c2581ab4@codeaurora.org"

Signed-off-by: Ingo Molnar <mingo@kernel.org>