Messages in this thread | | | From | Sebastian Andrzej Siewior <> | Subject | [PATCH v2 0/4] irq_work: PREEMPT_RT bits | Date | Wed, 6 Oct 2021 13:18:48 +0200 |
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This is v2 of the series. v1 can be found at https://lkml.kernel.org/20210927211919.310855-1-bigeasy@linutronix.de
Changelog: v1…v2: - Drop "irq_work: Ensure that irq_work runs in in-IRQ context". This triggers if a CPU goes down.
- #3 now uses per-CPU threads with the lowest RT priority instead of the timer softirq.
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 #3 introduces the required processing split of callbacks with are really invoked from hard-irq context and those which are processed in a per-CPU thread. Unless "LAZY" the thread is woken from the irq_work hardirq.
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
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