static const struct proto_ops pppol2tp_ops;
/* per-net private data for this module */
-static int pppol2tp_net_id;
+static int pppol2tp_net_id __read_mostly;
struct pppol2tp_net {
struct list_head pppol2tp_tunnel_list;
rwlock_t pppol2tp_tunnel_list_lock;