RCU_NOCB_WAKE
if (rcu_nocb_need_deferred_wakeup(rdp, RCU_NOCB_WAKE))
if (!rdp_gp || !rcu_nocb_need_deferred_wakeup(rdp_gp, RCU_NOCB_WAKE))
return do_nocb_deferred_wakeup_common(rdp_gp, rdp, RCU_NOCB_WAKE, flags);
if (rdp_gp->nocb_defer_wakeup < RCU_NOCB_WAKE)
wake_nocb_gp_defer(rdp, RCU_NOCB_WAKE,