Merge branch 'sched/rt' into sched/core, to pick up -rt changes

Pick up the first couple of patches working towards PREEMPT_RT.

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

diff --cc MAINTAINERS
Simple merge

diff --cc include/linux/sched.h
Simple merge

diff --cc kernel/events/core.c
Simple merge

diff --cc kernel/rcu/tree.c
Simple merge

diff --cc kernel/sched/core.c
Simple merge

diff --cc kernel/sched/fair.c
Simple merge

diff --cc kernel/sched/sched.h
Simple merge