CPU Hotplug Interface (and boot)
o	rcu_boot_init_percpu_data(),
	rcu_init_levelspread(),
	rcu_init_one(),
	__rcu_init_preempt(),
	rcu_bootup_announce_oddness(),
	rcu_bootup_announce(),
	rcu_init(),
	rcu_scheduler_starting(),
o	rcu_preempt_offline_tasks(),
	__rcu_offline_cpu(),
	rcu_preempt_offline_cpu(),
	rcu_offline_cpu(), 
	rcu_init_percpu_data(),
	rcu_preempt_init_percpu_data(),
	rcu_prepare_cpu(),
	rcu_cpu_notify(),
