tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 8548fd2f20ed19b0e8c0585b71fdfde1ae00ae3c commit: a4409c694c004f0b412b69c82f9f119d43d521af [9143/9312] Merge remote- tracking branch 'tty/tty-next' config: powerpc-pmac32_defconfig (attached as .config) compiler: powerpc-linux-gcc (GCC) 9.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp- tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout a4409c694c004f0b412b69c82f9f119d43d521af # save the attached .config to linux build tree GCC_VERSION=9.2.0 make.cross ARCH=powerpc 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 >>): >> ERROR: modpost: "sysrq_mask" [drivers/tty/serial/serial_core.ko] undefined!