netdev_debug_event
ns->nb.notifier_call = netdev_debug_event;
int netdev_debug_event(struct notifier_block *nb, unsigned long event,
.notifier_call = netdev_debug_event,
EXPORT_SYMBOL_NS_GPL(netdev_debug_event, "NETDEV_INTERNAL");
nb->notifier_call = netdev_debug_event;