tree: https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git topic/renesas-debug head: 19a13e050f789ac7d98a4b3320a376f5052e84a0 commit: 22eb3f0626ac322902b84663309a24753578ca32 [6/20] [DEBUG] soc: renesas: r8a7791: MSTP debug handling config: arm-defconfig (attached as .config) compiler: arm-linux-gnueabi-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 22eb3f0626ac322902b84663309a24753578ca32 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 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 >>): 528 | void __init r8a7791_disable_mstp_clocks(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/r8a7791_disable_mstp_clocks +528 drivers/soc/renesas/r8a7791-mstp.c 527 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org