[PATCH 0/5] irq_work: PREEMPT_RT bits

[Sebastian Andrzej Siewior]

This are the PREEMPT_RT bits for irq_work. The annotation for
IRQ_WORK_HARD_IRQ was already merged except for one missed annotation.
Patch #4 introduces the required processing split of callbacks with are
really invoked from hard-irq context and those which are delayed until
the softirq timer tick. This has been done as quite a few them acquire
locks which need to sleep on PREEMPT_RT and must not be invoked in
hardirq context. We can not delay all of them since a few need to be
invoked hardirq context in order to work properly (NOHZ, scheduler, …).

Sebastian