ip_tunnel: Call ip_tunnel_core_init() from inet_init()

Convert the module_init() to a invocation from inet_init() since
ip_tunnel_core is part of the INET built-in.

Fixes: 3093fbe7ff4 ("route: Per route IP tunnel metadata via lightweight tunnel")
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ip_tunnels.h

@@ -311,6 +311,8 @@ static inline int ip_tunnel_collect_metadata(void)
 	return static_key_false(&ip_tunnel_metadata_cnt);
 }
 
+void __init ip_tunnel_core_init(void);
+
 void ip_tunnel_need_metadata(void);
 void ip_tunnel_unneed_metadata(void);
 

net/ipv4/af_inet.c

@@ -112,6 +112,7 @@
 #include <net/raw.h>
 #include <net/icmp.h>
 #include <net/inet_common.h>
+#include <net/ip_tunnels.h>
 #include <net/xfrm.h>
 #include <net/net_namespace.h>
 #include <net/secure_seq.h>
@@ -1780,6 +1781,8 @@ static int __init inet_init(void)
 
 	dev_add_pack(&ip_packet_type);
 
+	ip_tunnel_core_init();
+
 	rc = 0;
 out:
 	return rc;

net/ipv4/ip_tunnel_core.c

@@ -292,19 +292,10 @@ static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
 	.get_encap_size = ip_tun_encap_nlsize,
 };
 
-static int __init ip_tunnel_core_init(void)
+void __init ip_tunnel_core_init(void)
 {
 	lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
-
-	return 0;
-}
-module_init(ip_tunnel_core_init);
-
-static void __exit ip_tunnel_core_exit(void)
-{
-	lwtunnel_encap_del_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
 }
-module_exit(ip_tunnel_core_exit);
 
 struct static_key ip_tunnel_metadata_cnt = STATIC_KEY_INIT_FALSE;
 EXPORT_SYMBOL(ip_tunnel_metadata_cnt);