lockdep: Add hrtimer context tracing bits

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Set current->irq_config = 1 for hrtimers which are not marked to expire in
hard interrupt context during hrtimer_init(). These timers will expire in
softirq context on PREEMPT_RT.

Setting this allows lockdep to differentiate these timers. If a timer is
marked to expire in hard interrupt context then the timer callback is not
supposed to acquire a regular spinlock instead of a raw_spinlock in the
expiry callback.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200321113242.534508206@linutronix.de

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Sebastian Andrzej Siewior 2020-03-21 12:26:02 +01:00 • committed by Peter Zijlstra

parent de8f5e4f2d

commit 40db173965

4 changed files with 22 additions and 2 deletions

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15

include/linux/irqflags.h

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1

include/linux/sched.h

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2

kernel/locking/lockdep.c

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6

kernel/time/hrtimer.c

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