Hi Xiaoming, Thank you for the patch! Yet something to improve: [auto build test ERROR on next-20200616] [cannot apply to tip/perf/core arm/for-next tip/x86/asm linus/master v5.8-rc1 v5.7 v5.7-rc7 v5.8-rc1] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Xiaoming-Ni/All-arch-remove-syst... base: 27f70ec4fa0e0f419031f1b8d61b1a788244e313 config: s390-allyesconfig (attached as .config) compiler: s390-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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390 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 >>, old ones prefixed by <<): s390-linux-ld: arch/s390/kernel/entry.o: in function `sys_call_table_emu': --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org