tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: d2f38a3c6507b2520101f9a3807ed98f1bdc545a commit: a927bd6ba952d13c52b8b385030943032f659a3e mm: fix phys_to_target_node() and memory_add_physaddr_to_nid() exports date: 12 months ago config: powerpc64-randconfig-r013-20211027 (attached as .config) compiler: powerpc64le-linux-gcc (GCC) 11.2.0 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 a927bd6ba952d13c52b8b385030943032f659a3e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 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 errors (new ones prefixed by >>): 174 | int __meminit create_section_mapping(unsigned long start, unsigned long end, | ^~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/mm/book3s64/pgtable.c:405:6: error: no previous prototype for 'arch_report_meminfo' [-Werror=missing-prototypes] 405 | void arch_report_meminfo(struct seq_file *m) | ^~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors vim +/create_section_mapping +174 arch/powerpc/mm/book3s64/pgtable.c 32b53c012e0bfe arch/powerpc/mm/pgtable-book3s64.c Reza Arbab 2017-01-03 172 32b53c012e0bfe arch/powerpc/mm/pgtable-book3s64.c Reza Arbab 2017-01-03 173 #ifdef CONFIG_MEMORY_HOTPLUG 4e00c5affdd4b0 arch/powerpc/mm/book3s64/pgtable.c Logan Gunthorpe 2020-04-10 @174 int __meminit create_section_mapping(unsigned long start, unsigned long end, 4e00c5affdd4b0 arch/powerpc/mm/book3s64/pgtable.c Logan Gunthorpe 2020-04-10 175 int nid, pgprot_t prot) 32b53c012e0bfe arch/powerpc/mm/pgtable-book3s64.c Reza Arbab 2017-01-03 176 { 32b53c012e0bfe arch/powerpc/mm/pgtable-book3s64.c Reza Arbab 2017-01-03 177 if (radix_enabled()) 4e00c5affdd4b0 arch/powerpc/mm/book3s64/pgtable.c Logan Gunthorpe 2020-04-10 178 return radix__create_section_mapping(start, end, nid, prot); 32b53c012e0bfe arch/powerpc/mm/pgtable-book3s64.c Reza Arbab 2017-01-03 179 4e00c5affdd4b0 arch/powerpc/mm/book3s64/pgtable.c Logan Gunthorpe 2020-04-10 180 return hash__create_section_mapping(start, end, nid, prot); 32b53c012e0bfe arch/powerpc/mm/pgtable-book3s64.c Reza Arbab 2017-01-03 181 } 32b53c012e0bfe arch/powerpc/mm/pgtable-book3s64.c Reza Arbab 2017-01-03 182 :::::: The code at line 174 was first introduced by commit :::::: 4e00c5affdd4b04e6392001716333971932f3d0c powerpc/mm: thread pgprot_t through create_section_mapping() :::::: TO: Logan Gunthorpe <logang(a)deltatee.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org