tree: https://github.com/congwang/linux.git sockmap1-v2 head: dbcb8c1d39a99e8cc66bd7ced359d4b986776f78 commit: 847353ec78c927b3a10beb39e7786d6e3b76fb43 [1/5] bpf: clean up CONFIG_BPF_STREAM_PARSER config: arc-vdk_hs38_defconfig (attached as .config) compiler: arc-elf-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/847353ec78c927b3a10beb39e7786d6e... git remote add congwang https://github.com/congwang/linux.git git fetch --no-tags congwang sockmap1-v2 git checkout 847353ec78c927b3a10beb39e7786d6e3b76fb43 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 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 >>): arc-elf-ld: net/ipv4/tcp_minisocks.o: in function `tcp_create_openreq_child': tcp_minisocks.c:(.text+0x790): undefined reference to `tcp_bpf_clone' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org