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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2020-03-21 12:26:02 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-03-21 16:00:24 +0100 |
| commit | 40db173965c05a1d803451240ed41707d5bd978d (patch) | |
| tree | c5629cb1e7034131b69c247d392e256be5dfc396 /kernel/time | |
| parent | de8f5e4f2dc1f032b46afda0a78cab5456974f89 (diff) | |
| download | linux-40db173965c05a1d803451240ed41707d5bd978d.tar.gz linux-40db173965c05a1d803451240ed41707d5bd978d.tar.bz2 linux-40db173965c05a1d803451240ed41707d5bd978d.zip | |
lockdep: Add hrtimer context tracing bits
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
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/hrtimer.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c index 3a609e7344f3..8cce72501aea 100644 --- a/kernel/time/hrtimer.c +++ b/kernel/time/hrtimer.c @@ -1404,7 +1404,7 @@ static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id, base = softtimer ? HRTIMER_MAX_CLOCK_BASES / 2 : 0; base += hrtimer_clockid_to_base(clock_id); timer->is_soft = softtimer; - timer->is_hard = !softtimer; + timer->is_hard = !!(mode & HRTIMER_MODE_HARD); timer->base = &cpu_base->clock_base[base]; timerqueue_init(&timer->node); } @@ -1514,7 +1514,11 @@ static void __run_hrtimer(struct hrtimer_cpu_base *cpu_base, */ raw_spin_unlock_irqrestore(&cpu_base->lock, flags); trace_hrtimer_expire_entry(timer, now); + lockdep_hrtimer_enter(timer); + restart = fn(timer); + + lockdep_hrtimer_exit(timer); trace_hrtimer_expire_exit(timer); raw_spin_lock_irq(&cpu_base->lock); |