Hi Yang, Thank you for the patch! Yet something to improve: [auto build test ERROR on mmotm/master] [also build test ERROR on linus/master v5.6-rc6 next-20200316] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Yang-Shi/mm-swap-make-page_evict... base: git://git.cmpxchg.org/linux-mmotm.git master config: openrisc-simple_smp_defconfig (attached as .config) compiler: or1k-linux-gcc (GCC) 9.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=9.2.0 make.cross ARCH=openrisc If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from include/linux/suspend.h:5, from init/do_mounts.c:7: include/linux/swap.h: In function 'page_evictable': include/linux/swap.h:395:9: error: implicit declaration of function 'mapping_unevictable'; did you mean 'mapping_deny_writable'? [-Werror=implicit-function-declaration] 395 | ret = !mapping_unevictable(page_mapping(page)) && !PageMlocked(page); | ^~~~~~~~~~~~~~~~~~~ | mapping_deny_writable In file included from include/linux/mempolicy.h:16, from include/linux/shmem_fs.h:7, from init/do_mounts.c:21: include/linux/pagemap.h: At top level: 73 | static inline bool mapping_unevictable(struct address_space *mapping) | ^~~~~~~~~~~~~~~~~~~ In file included from include/linux/suspend.h:5, from init/do_mounts.c:7: include/linux/swap.h:395:9: note: previous implicit declaration of 'mapping_unevictable' was here 395 | ret = !mapping_unevictable(page_mapping(page)) && !PageMlocked(page); | ^~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/mapping_unevictable +73 include/linux/pagemap.h 72 74 { 75 if (mapping) 76 return test_bit(AS_UNEVICTABLE, &mapping->flags); 77 return !!mapping; 78 } 79 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org