void __init sched_init_smp(void)
{
	cpumask_var_t non_isolated_cpus;

	alloc_cpumask_var(&non_isolated_cpus, GFP_KERNEL);
	alloc_cpumask_var(&fallback_doms, GFP_KERNEL);

	sched_init_numa();

	/*
	 * There's no userspace yet to cause hotplug operations; hence all the
	 * cpu masks are stable and all blatant races in the below code cannot
	 * happen.
	 */
	mutex_lock(&sched_domains_mutex);
	init_sched_domains(cpu_active_mask);
	cpumask_andnot(non_isolated_cpus, cpu_possible_mask, cpu_isolated_map);
	if (cpumask_empty(non_isolated_cpus))
		cpumask_set_cpu(smp_processor_id(), non_isolated_cpus);
	mutex_unlock(&sched_domains_mutex);

	hotcpu_notifier(sched_domains_numa_masks_update, CPU_PRI_SCHED_ACTIVE);
	hotcpu_notifier(cpuset_cpu_active, CPU_PRI_CPUSET_ACTIVE);
	hotcpu_notifier(cpuset_cpu_inactive, CPU_PRI_CPUSET_INACTIVE);

	init_hrtick();

	/* Move init over to a non-isolated CPU */
	if (set_cpus_allowed_ptr(current, non_isolated_cpus) < 0)
		BUG();
	sched_init_granularity();
	free_cpumask_var(non_isolated_cpus);

	init_sched_rt_class();
	init_sched_dl_class();
}

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