hrtimer: Introduce HARD expiry mode
On PREEMPT_RT not all hrtimers can be expired in hard interrupt context even if that is perfectly fine on a PREEMPT_RT=n kernel, e.g. because they take regular spinlocks. Also for latency reasons PREEMPT_RT tries to defer most hrtimers' expiry into soft interrupt context. But there are hrtimers which must be expired in hard interrupt context even when PREEMPT_RT is enabled: - hrtimers which must expiry in hard interrupt context, e.g. scheduler, perf, watchdog related hrtimers - latency critical hrtimers, e.g. nanosleep, ..., kvm lapic timer Add a new mode flag HRTIMER_MODE_HARD which allows to mark these timers so PREEMPT_RT will not move them into softirq expiry mode. [ tglx: Split out of a larger combo patch. Added changelog ] Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20190726185752.981398465@linutronix.de
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@ -38,6 +38,7 @@ enum hrtimer_mode {
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HRTIMER_MODE_REL = 0x01,
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HRTIMER_MODE_PINNED = 0x02,
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HRTIMER_MODE_SOFT = 0x04,
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HRTIMER_MODE_HARD = 0x08,
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HRTIMER_MODE_ABS_PINNED = HRTIMER_MODE_ABS | HRTIMER_MODE_PINNED,
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HRTIMER_MODE_REL_PINNED = HRTIMER_MODE_REL | HRTIMER_MODE_PINNED,
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@ -48,6 +49,11 @@ enum hrtimer_mode {
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HRTIMER_MODE_ABS_PINNED_SOFT = HRTIMER_MODE_ABS_PINNED | HRTIMER_MODE_SOFT,
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HRTIMER_MODE_REL_PINNED_SOFT = HRTIMER_MODE_REL_PINNED | HRTIMER_MODE_SOFT,
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HRTIMER_MODE_ABS_HARD = HRTIMER_MODE_ABS | HRTIMER_MODE_HARD,
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HRTIMER_MODE_REL_HARD = HRTIMER_MODE_REL | HRTIMER_MODE_HARD,
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HRTIMER_MODE_ABS_PINNED_HARD = HRTIMER_MODE_ABS_PINNED | HRTIMER_MODE_HARD,
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HRTIMER_MODE_REL_PINNED_HARD = HRTIMER_MODE_REL_PINNED | HRTIMER_MODE_HARD,
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};
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/*
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