Merge branch 'sched/urgent' into x86/mm, to pick up dependent fix

Andy will need the following scheduler fix for the PCID series:

  252d2a4117bc: sched/core: Idle_task_exit() shouldn't use switch_mm_irqs_off()

So do a cross-merge.

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