tree: https://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc.git topic-zol-remove head: f2709e461ce51e131e57d07a45a634f3b79b5298 commit: b1afff27a36ab56a6ed1d5933731a360aa896ad3 [80/187] xxx: debug fork/execve config: riscv-randconfig-r042-20211021 (attached as .config) compiler: riscv64-linux-gcc (GCC) 11.2.0 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://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc.git/commit/?id... git remote add vgupta-arc https://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc.git git fetch --no-tags vgupta-arc topic-zol-remove git checkout b1afff27a36ab56a6ed1d5933731a360aa896ad3 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=riscv SHELL=/bin/bash 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 >>): riscv64-linux-ld: kernel/fork.o: in function `.L0 ': fork.c:(.text+0x1ea6): undefined reference to `arc_debug' riscv64-linux-ld: kernel/fork.o: in function `.L584': fork.c:(.text+0x2626): undefined reference to `arc_debug' riscv64-linux-ld: kernel/kthread.o: in function `kthread_probe_data': riscv64-linux-ld: fs/exec.o: in function `.L18': exec.c:(.text+0x1204): undefined reference to `arc_debug' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org