RCU_NOCB_WAKE_NOT
if (rdp_gp->nocb_defer_wakeup > RCU_NOCB_WAKE_NOT) {
WRITE_ONCE(rdp_gp->nocb_defer_wakeup, RCU_NOCB_WAKE_NOT);
rdp_gp->nocb_defer_wakeup == RCU_NOCB_WAKE_NOT) {