Hi Baolin, kernel test robot noticed the following build errors: [auto build test ERROR on akpm-mm/mm-everything] url: https://github.com/intel-lab-lkp/linux/commits/Baolin-Wang/mm-compaction-skip-memory-hole-rapidly-when-isolating-migratable-pages/20230609-174659 base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/8cc668b77c8eb2fa78058b3d81386ebed9c5a9cd.1686294549.git.baolin.wang%40linux.alibaba.com patch subject: [PATCH] mm: compaction: skip memory hole rapidly when isolating migratable pages config: arm-randconfig-r025-20230609 (https://download.01.org/0day-ci/archive/20230609/202306092250.cp65gzkn-lkp@xxxxxxxxx/config) compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07) reproduce (this is a W=1 build): mkdir -p ~/bin wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi git remote add akpm-mm https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git git fetch akpm-mm mm-everything git checkout akpm-mm/mm-everything b4 shazam https://lore.kernel.org/r/8cc668b77c8eb2fa78058b3d81386ebed9c5a9cd.1686294549.git.baolin.wang@xxxxxxxxxxxxxxxxx # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=arm olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202306092250.cp65gzkn-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): >> mm/compaction.c:235:27: error: call to undeclared function 'pfn_to_section_nr'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] unsigned long start_nr = pfn_to_section_nr(start_pfn); ^ >> mm/compaction.c:237:6: error: call to undeclared function 'online_section_nr'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] if (online_section_nr(start_nr)) ^ >> mm/compaction.c:240:19: error: call to undeclared function 'next_online_section_nr'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] next_online_nr = next_online_section_nr(start_nr); ^ >> mm/compaction.c:242:10: error: call to undeclared function 'section_nr_to_pfn'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] return section_nr_to_pfn(next_online_nr); ^ 4 errors generated. vim +/pfn_to_section_nr +235 mm/compaction.c 231 232 static unsigned long skip_hole_pageblock(unsigned long start_pfn) 233 { 234 unsigned long next_online_nr; > 235 unsigned long start_nr = pfn_to_section_nr(start_pfn); 236 > 237 if (online_section_nr(start_nr)) 238 return -1UL; 239 > 240 next_online_nr = next_online_section_nr(start_nr); 241 if (next_online_nr != -1UL) > 242 return section_nr_to_pfn(next_online_nr); 243 244 return -1UL; 245 } 246 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
