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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2020-03-21 14:26:02 +0300
committerPeter Zijlstra <peterz@infradead.org>2020-03-21 18:00:24 +0300
commit40db173965c05a1d803451240ed41707d5bd978d (patch)
treec5629cb1e7034131b69c247d392e256be5dfc396 /kernel/time
parentde8f5e4f2dc1f032b46afda0a78cab5456974f89 (diff)
downloadlinux-40db173965c05a1d803451240ed41707d5bd978d.tar.xz
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.c6
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);