ppp_register_net_channel
return ppp_register_net_channel(current->nsproxy->net_ns, chan);
EXPORT_SYMBOL(ppp_register_net_channel);
error = ppp_register_net_channel(dev_net(dev), &po->chan);
extern int ppp_register_net_channel(struct net *, struct ppp_channel *);
error = ppp_register_net_channel(sock_net(sk), &po->chan);