Commit da6ff099 authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Peter Zijlstra
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sched/rt: Annotate the RT balancing logic irqwork as IRQ_WORK_HARD_IRQ 



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: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20211006111852.1514359-2-bigeasy@linutronix.de
parent 66558b73

kernel/sched/topology.c

+1 −1
Original line number Diff line number Diff line
@@ -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;