Hi all, After merging the net-next tree, today's linux-next build (s390 defconfig) failed like this: net/ipv4/ip_tunnel_core.c:335:2: error: implicit declaration of function 'csum_ipv6_magic' [-Werror=implicit-function-declaration] Caused by commit 4cb47a8644cc ("tunnels: PMTU discovery support for directly bridged IP packets") -- Cheers, Stephen Rothwell