On Fri, Dec 13, 2024 at 01:14:54AM +0100, Thomas Gleixner wrote: > --- a/kernel/sched/core.c > +++ b/kernel/sched/core.c > @@ -7276,7 +7276,7 @@ void rt_mutex_setprio(struct task_struct > #if !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC) > int __sched __cond_resched(void) > { > - if (should_resched(0)) { > + if (should_resched(0) && system_state != SYSTEM_SUSPEND) { > preempt_schedule_common(); > return 1; > } Perhaps we should just do: if (should_resched(0) && !irqs_disabled()) That's more or less what preemptible() does too. Yes, mucking about with IF is expensive, but it's only done if preempt_count is agreeing we should schedule, which it shouldn't be most of the time.