Hi Matthew, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 32ef9553635ab1236c33951a8bd9b5af1c3b1646 commit: 5a74ac4c4a97bd8b7dba054304d598e2a882fea6 idr: Fix idr_get_next_ul race with idr_remove date: 4 weeks ago config: arc-defconfig (attached as .config) compiler: arc-elf-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 5a74ac4c4a97bd8b7dba054304d598e2a882fea6 # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=arc If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): {standard input}: Assembler messages: {standard input}:906: Error: operand out of range (128 is not between -128 and 127) --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation