linux-kernel - [PATCH] sched_ext: Use IRQ_WORK_INIT_HARD() to initialize rq->scx.kick_cpus_irq

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Message-ID: <20251117125311.107687-1-qiang.zhang@linux.dev>
Date: Mon, 17 Nov 2025 20:53:10 +0800
From: Zqiang <qiang.zhang@...ux.dev>
To: tj@...nel.org,
	void@...ifault.com,
	arighi@...dia.com,
	changwoo@...lia.com
Cc: sched-ext@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	qiang.zhang@...ux.dev,
	qiang.zhang1211@...il.com
Subject: [PATCH] sched_ext: Use IRQ_WORK_INIT_HARD() to initialize rq->scx.kick_cpus_irq_work

For PREEMPT_RT kernels, the kick_cpus_irq_workfn() be invoked in
the per-cpu irq_work/* task context and there is no rcu-read critical
section to protect. this commit therefore use IRQ_WORK_INIT_HARD() to
initialize the per-cpu rq->scx.kick_cpus_irq_work in the
init_sched_ext_class().

Signed-off-by: Zqiang <qiang.zhang@...ux.dev>
---
 kernel/sched/ext.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 8b88a9e69f8a..c8de9ec70d75 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -5628,7 +5628,7 @@ void __init init_sched_ext_class(void)
 		BUG_ON(!zalloc_cpumask_var_node(&rq->scx.cpus_to_preempt, GFP_KERNEL, n));
 		BUG_ON(!zalloc_cpumask_var_node(&rq->scx.cpus_to_wait, GFP_KERNEL, n));
 		rq->scx.deferred_irq_work = IRQ_WORK_INIT_HARD(deferred_irq_workfn);
-		init_irq_work(&rq->scx.kick_cpus_irq_work, kick_cpus_irq_workfn);
+		rq->scx.kick_cpus_irq_work = IRQ_WORK_INIT_HARD(kick_cpus_irq_workfn);
 
 		if (cpu_online(cpu))
 			cpu_rq(cpu)->scx.flags |= SCX_RQ_ONLINE;
-- 
2.48.1