6.17-stable review patch. If anyone has any objections, please let me know.
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From: Zqiang qiang.zhang@linux.dev
[ Upstream commit 36c6f3c03d104faf1aa90922f2310549c175420f ]
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@linux.dev Signed-off-by: Tejun Heo tj@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 16a7ae9b29ae4..9592579db949d 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -5378,7 +5378,7 @@ 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;