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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
This commit is contained in:
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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2
kernel/locking/lockdep.c
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@@ -4025,7 +4025,7 @@ static int check_wait_context(struct task_struct *curr, struct held_lock *next)
/*
* Check if force_irqthreads will run us threaded.
*/
if (curr->hardirq_threaded)
if (curr->hardirq_threaded || curr->irq_config)
curr_inner = LD_WAIT_CONFIG;
else
curr_inner = LD_WAIT_SPIN;