> +static void schedule_cpuset_propagate_hotplug(struct cpuset *cs)
> +{
> + /*
> + * Pin @cs. The refcnt will be released when the work item
> + * finishes executing.
> + */
> + if (!css_tryget(&cs->css))
> + return;
> +
> + /*
> + * Queue @cs->empty_cpuset_work. If already pending, lose the css
cs->hotplug_work
> + * ref. cpuset_propagate_hotplug_wq is ordered and propagation
> + * will happen in the order this function is called.
> + */
> + if (!queue_work(cpuset_propagate_hotplug_wq, &cs->hotplug_work))
> + css_put(&cs->css);
> }
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