net/ipv6/ip6_tunnel.c:1869: warning: No description found for return value of 'ip6_tnl_dev_init_gen'
net/ipv6/ip6_tunnel.c:1913: warning: No description found for return value of 'ip6_tnl_dev_init'
net/ipv6/ip6_tunnel.c:1871: warning: No description found for return value of 'ip6_tnl_dev_init_gen'
net/ipv6/ip6_tunnel.c:1914: warning: No description found for return value of 'ip6_tnl_dev_init'