Hi Masahiro, I love your patch! Yet something to improve: [auto build test ERROR on powerpc/next] [also build test ERROR on kbuild/for-next arm64/for-next/core linus/master v5.10-rc7 next-20201211] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Masahiro-Yamada/kbuild-do-not-us... base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next config: powerpc-tqm8xx_defconfig (attached as .config) compiler: powerpc-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/0day-ci/linux/commit/0eab60f5e1f804528a4d0dd9566cb30f6... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Masahiro-Yamada/kbuild-do-not-use-scripts-ld-version-sh-for-checking-spatch-version/20201213-010621 git checkout 0eab60f5e1f804528a4d0dd9566cb30f62242d22 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc 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 >>): /bin/sh: 1: [: -lt: unexpected operator -- -- --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org