tree: https://github.com/zen-kernel/zen-kernel 5.12/futex2 head: 81255c11c48cc2302883425c87318f9cad37e7e6 commit: 74b2323f995135be08649b48df710e78efcf7f62 [13/16] kernel: Enable waitpid() for futex2 config: nds32-allnoconfig (attached as .config) compiler: nds32le-linux-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/zen-kernel/zen-kernel/commit/74b2323f995135be08649b48d... git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel git fetch --no-tags zen-kernel-zen-kernel 5.12/futex2 git checkout 74b2323f995135be08649b48df710e78efcf7f62 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nds32 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 >>): nds32le-linux-ld: kernel/fork.o: in function `.L21': fork.c:(.text+0xc2): undefined reference to `ksys_futex_wake' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org