tree: https://github.com/congwang/linux.git sockmap1 head: b2dfda210226f6718a7bab6ba27fca4958cf5fde commit: ade71f1d50ccf7cbbd5fcd8bd741d9142c7dca77 [1/7] bpf: clean up sockmap related Kconfigs config: arm-randconfig-r005-20210215 (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/congwang/linux/commit/ade71f1d50ccf7cbbd5fcd8bd741d914... git remote add congwang https://github.com/congwang/linux.git git fetch --no-tags congwang sockmap1 git checkout ade71f1d50ccf7cbbd5fcd8bd741d9142c7dca77 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): net/ipv4/tcp_bpf.c: In function 'tcp_bpf_rebuild_protos': 563 | prot[TCP_BPF_BASE].unhash = sock_map_unhash; | ^~~~~~~~~~~~~~~ net/ipv4/tcp_bpf.c:563:31: note: each undeclared identifier is reported only once for each function it appears in 564 | prot[TCP_BPF_BASE].close = sock_map_close; | ^~~~~~~~~~~~~~ | sk_msg_clone -- net/ipv4/udp_bpf.c: In function 'udp_bpf_rebuild_protos': 21 | prot->unhash = sock_map_unhash; | ^~~~~~~~~~~~~~~ net/ipv4/udp_bpf.c:21:17: note: each undeclared identifier is reported only once for each function it appears in 22 | prot->close = sock_map_close; | ^~~~~~~~~~~~~~ | sk_msg_clone vim +/sock_map_unhash +563 net/ipv4/tcp_bpf.c 604326b41a6fb9 Daniel Borkmann 2018-10-13 558 604326b41a6fb9 Daniel Borkmann 2018-10-13 559 static void tcp_bpf_rebuild_protos(struct proto prot[TCP_BPF_NUM_CFGS], 604326b41a6fb9 Daniel Borkmann 2018-10-13 560 struct proto *base) 604326b41a6fb9 Daniel Borkmann 2018-10-13 561 { 604326b41a6fb9 Daniel Borkmann 2018-10-13 562 prot[TCP_BPF_BASE] = *base; f747632b608f90 Lorenz Bauer 2020-03-09 @563 prot[TCP_BPF_BASE].unhash = sock_map_unhash; f747632b608f90 Lorenz Bauer 2020-03-09 @564 prot[TCP_BPF_BASE].close = sock_map_close; 604326b41a6fb9 Daniel Borkmann 2018-10-13 565 prot[TCP_BPF_BASE].recvmsg = tcp_bpf_recvmsg; 604326b41a6fb9 Daniel Borkmann 2018-10-13 566 prot[TCP_BPF_BASE].stream_memory_read = tcp_bpf_stream_read; 604326b41a6fb9 Daniel Borkmann 2018-10-13 567 604326b41a6fb9 Daniel Borkmann 2018-10-13 568 prot[TCP_BPF_TX] = prot[TCP_BPF_BASE]; 604326b41a6fb9 Daniel Borkmann 2018-10-13 569 prot[TCP_BPF_TX].sendmsg = tcp_bpf_sendmsg; 604326b41a6fb9 Daniel Borkmann 2018-10-13 570 prot[TCP_BPF_TX].sendpage = tcp_bpf_sendpage; 604326b41a6fb9 Daniel Borkmann 2018-10-13 571 } 604326b41a6fb9 Daniel Borkmann 2018-10-13 572 :::::: The code at line 563 was first introduced by commit :::::: f747632b608f90217a4e9ebb1deba8a37612aa32 bpf: sockmap: Move generic sockmap hooks from BPF TCP :::::: TO: Lorenz Bauer <lmb(a)cloudflare.com&gt; :::::: CC: Daniel Borkmann <daniel(a)iogearbox.net&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org