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sched/rt: Annotate the RT balancing logic irqwork as IRQ_WORK_HARD_IRQ

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The push-IPI logic for RT tasks expects to be invoked from hardirq
context. One reason is that a RT task on the remote CPU would block the
softirq processing on PREEMPT_RT and so avoid pulling / balancing the RT
tasks as intended.

Annotate root_domain::rto_push_work as IRQ_WORK_HARD_IRQ.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20211006111852.1514359-2-bigeasy@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2021-10-06 13:18:49 +02:00 committed by Peter Zijlstra
parent 66558b730f
commit da6ff09943
1 changed files with 1 additions and 1 deletions
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kernel/sched/topology.c
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@ -526,7 +526,7 @@ static int init_rootdomain(struct root_domain *rd)
#ifdef HAVE_RT_PUSH_IPI
rd->rto_cpu = -1;
raw_spin_lock_init(&rd->rto_lock);
init_irq_work(&rd->rto_push_work, rto_push_irq_work_func);
rd->rto_push_work = IRQ_WORK_INIT_HARD(rto_push_irq_work_func);
#endif
rd->visit_gen = 0;