The following commit has been merged into the sched/core branch of tip: Commit-ID: da6ff09943491819e077b94c284bf0a6b751c9b8 Gitweb: https://git.kernel.org/tip/da6ff09943491819e077b94c284bf0a6b751c9b8 Author: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> AuthorDate: Wed, 06 Oct 2021 13:18:49 +02:00 Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx> CommitterDate: Fri, 15 Oct 2021 11:25:16 +02:00 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: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Link: https://lkml.kernel.org/r/20211006111852.1514359-2-bigeasy@xxxxxxxxxxxxx --- kernel/sched/topology.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index c1729f9..e812467 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -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;
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