Hi Kumar, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: ef6b35306dd8f15a7e5e5a2532e665917a43c5d9 commit: b4c2b9593a1c4c3a718370e34af28e817fd5e5c6 [710/4147] net/netfilter: Add unstable CT lookup helpers for XDP and TC-BPF config: i386-debian-10.3-kselftests (https://download.01.org/0day-ci/archive/20220207/202202071436.tEl98zc6-lkp@xxxxxxxxx/config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=b4c2b9593a1c4c3a718370e34af28e817fd5e5c6 git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout b4c2b9593a1c4c3a718370e34af28e817fd5e5c6 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> net/netfilter/nf_conntrack_bpf.c:251:5: warning: no previous prototype for 'register_nf_conntrack_bpf' [-Wmissing-prototypes] 251 | int register_nf_conntrack_bpf(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~ vim +/register_nf_conntrack_bpf +251 net/netfilter/nf_conntrack_bpf.c 250 > 251 int register_nf_conntrack_bpf(void) --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
