tree: https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git xdp-queueing-01 head: 7cdc645073a59261514e56e1a4c6d0dac1b24b32 commit: de44bbfd9cf981baab181c006dc363c5f412d94c [4/9] bpf: Add helpers to dequeue from a PIFO map config: riscv-buildonly-randconfig-r002-20211111 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 63ef0e17e28827eae53133b3467bdac7d9729318) 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 # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git/commit/?id... git remote add toke https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git git fetch --no-tags toke xdp-queueing-01 git checkout de44bbfd9cf981baab181c006dc363c5f412d94c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv 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/core/filter.c:3992:10: error: implicit declaration of function 'pifo_map_enqueue' [-Werror,-Wimplicit-function-declaration] err = pifo_map_enqueue(map, xdp, ri->tgt_index); ^ return (unsigned long)pifo_map_dequeue(map, flags); ^ net/core/filter.c:10088:15: error: use of undeclared identifier 'bpf_prog_test_run_dequeue' .test_run = bpf_prog_test_run_dequeue, ^ 3 errors generated. vim +/pifo_map_dequeue +4153 net/core/filter.c 4149 4150 BPF_CALL_3(bpf_packet_dequeue, struct dequeue_data *, ctx, struct bpf_map *, map, 4151 u64, flags) 4152 { 4154 } 4155 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org