Hi Christian, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on bpf-next/master] url: https://github.com/intel-lab-lkp/linux/commits/Christian-Ehrig/ipip-ip_tunnel-sit-Add-FOU-support-for-externally-controlled-ipip-devices/20230402-033512 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master patch link: https://lore.kernel.org/r/65b05e447b28d32fb0e07275dc988989f358da2c.1680379518.git.cehrig%40cloudflare.com patch subject: [PATCH bpf-next 2/3] bpf,fou: Add bpf_skb_{set,get}_fou_encap kfuncs config: i386-randconfig-a005 (https://download.01.org/0day-ci/archive/20230402/202304020430.KvQEwmII-lkp@xxxxxxxxx/config) compiler: gcc-11 (Debian 11.3.0-8) 11.3.0 reproduce (this is a W=1 build): # https://github.com/intel-lab-lkp/linux/commit/111ef54093a724110ca63e6a6279e60dd669094b git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Christian-Ehrig/ipip-ip_tunnel-sit-Add-FOU-support-for-externally-controlled-ipip-devices/20230402-033512 git checkout 111ef54093a724110ca63e6a6279e60dd669094b # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=i386 olddefconfig make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash net/ipv4/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Link: https://lore.kernel.org/oe-kbuild-all/202304020430.KvQEwmII-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> net/ipv4/fou_bpf.c:114:5: warning: no previous prototype for 'register_fou_bpf' [-Wmissing-prototypes] 114 | int register_fou_bpf(void) | ^~~~~~~~~~~~~~~~ vim +/register_fou_bpf +114 net/ipv4/fou_bpf.c 113 > 114 int register_fou_bpf(void) -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
