Merge branch 'core/rcu' into sched/core, to pick up dependency

We are going to rely on the loosening of RCU callback semantics,
introduced by this commit:

  806f04e9fd2c: ("rcu: Allow for smp_call_function() running callbacks from idle")

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

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

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

diff --cc kernel/fork.c
Simple merge

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