Hi Arnd, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f8e6dfc64f6135d1b6c5215c14cd30b9b60a0008 commit: a734bbf694270dca8594a5c33375867dc31503f5 m68k: m68328: move platform code to separate files date: 8 months ago config: m68k-randconfig-r005-20210813 (attached as .config) compiler: m68k-linux-gcc (GCC) 10.3.0 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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout a734bbf694270dca8594a5c33375867dc31503f5 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=m68k If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): 38 | void __init init_dragen2(char *command, int size) | ^~~~~~~~~~~~ arch/m68k/68000/dragen2.c: In function 'init_dragen2': arch/m68k/68000/dragen2.c:73:16: error: 'screen_bits' undeclared (first use in this function) 73 | LSSA = (long) screen_bits; | ^~~~~~~~~~~ arch/m68k/68000/dragen2.c:73:16: note: each undeclared identifier is reported only once for each function it appears in vim +/init_dragen2 +38 arch/m68k/68000/dragen2.c 37 39 { 40 mach_reset = dragen2_reset; 41 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org