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: m68k-randconfig-r005-20211019 (attached as .config) compiler: m68k-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=m68k 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 >>): m68k-linux-ld: arch/m68k/kernel/machine_kexec.o: in function `machine_kexec': machine_kexec.c:(.text+0x154): undefined reference to `m68k_mmutype' m68k-linux-ld: machine_kexec.c:(.text+0x15c): undefined reference to `m68k_cputype' m68k-linux-ld: arch/m68k/kernel/relocate_kernel.o:(.m68k_fixup+0x0): undefined reference to `M68K_FIXUP_MEMOFFSET' m68k-linux-ld: arch/m68k/kernel/relocate_kernel.o:(.m68k_fixup+0x8): undefined reference to `M68K_FIXUP_MEMOFFSET' m68k-linux-ld: kernel/fork.o: in function `copy_process': fork.c:(.text+0x1f6a): undefined reference to `arc_debug' m68k-linux-ld: kernel/fork.o: in function `kernel_clone': fork.c:(.text+0x29c2): undefined reference to `arc_debug' m68k-linux-ld: kernel/kthread.o: in function `kthreadd': kthread.c:(.text+0xef6): undefined reference to `arc_debug' m68k-linux-ld: fs/exec.o: in function `bprm_execve.part.0': --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org