tree: https://github.com/linuxppc/linux next-test head: 30133c32d19c678dbd9da28ace3aac35eb5dd4c9 commit: 1f4165b859f7a32b147fe4cac2d558001ed7e1ee [59/77] powerpc/pci: Add ppc_md.discover_phbs() config: powerpc-allyesconfig (attached as .config) compiler: powerpc64-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://github.com/linuxppc/linux/commit/1f4165b859f7a32b147fe4cac2d55800... git remote add linuxppc https://github.com/linuxppc/linux git fetch --no-tags linuxppc next-test git checkout 1f4165b859f7a32b147fe4cac2d558001ed7e1ee # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc 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 >>): 1704 | int __init discover_phbs(void) | ^~~~~~~~~~~~~ vim +/discover_phbs +1704 arch/powerpc/kernel/pci-common.c 1702 1703 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org