tree: https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git topic/renesas-debug head: 19a13e050f789ac7d98a4b3320a376f5052e84a0 commit: cff4ebb63f314f3c191a893b8bfce4877b5b1572 [12/20] [DEBUG] soc: renesas: r8a77990: MSTP debug handling config: arm64-allyesconfig (attached as .config) compiler: aarch64-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://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git... git remote add renesas-drivers https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git git fetch --no-tags renesas-drivers topic/renesas-debug git checkout cff4ebb63f314f3c191a893b8bfce4877b5b1572 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 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 >>): 544 | void __init r8a77990_disable_mstp_clocks(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/r8a77990_disable_mstp_clocks +544 drivers/soc/renesas/r8a77990-mstp.c 543 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org