Dyntick-Idle Interface
x	rcu_enter_nohz(), rcu_exit_nohz(), rcu_nmi_enter(), rcu_nmi_exit(),
	rcu_irq_enter(), rcu_irq_exit()
	
o	rcu_needs_cpu_quick_check(), rcu_preempt_needs_cpu(),
	rcu_needs_cpu(), rcu_needs_cpu_flush(),
