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

Pull RCU updates from Paul E. McKenney:

 - Documentation updates
 - Miscellaneous fixes
 - RCU CPU stall-warning updates
 - Torture-test updates
Signed-off-by: Ingo Molnar <mingo@kernel.org>