Re: [PATCH] mm: compaction: skip memory hole rapidly when isolating migratable pages

[kernel test robot <lkp@intel.com>]

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@intel.com/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@linux.alibaba.com
        # 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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306092250.cp65gzkn-lkp@intel.com/

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