tree: https://github.com/0day-ci/linux/commits/UPDATE-20210129-103224/Steven-Ro... head: c140cea32477ff764802c34df91fd920fee36903 commit: c140cea32477ff764802c34df91fd920fee36903 x86/mm: Tracking linear mapping split events date: 2 weeks ago config: i386-randconfig-a016-20210209 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/c140cea32477ff764802c34df91fd920f... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review UPDATE-20210129-103224/Steven-Rostedt/sched-tracing-Reset-critical-timings-on-scheduling/20210129-032839 git checkout c140cea32477ff764802c34df91fd920fee36903 # save the attached .config to linux build tree make W=1 ARCH=i386 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 >>): arch/x86/mm/pat/set_memory.c:90:6: warning: no previous prototype for 'update_split_page_event_count' [-Wmissing-prototypes] 90 | void update_split_page_event_count(int level) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/x86/mm/pat/set_memory.c: In function 'update_split_page_event_count': 95 | count_vm_event(DIRECT_MAP_2M_SPLIT); | ^~~~~~~~~~~~~~~~~~~ arch/x86/mm/pat/set_memory.c:95:19: note: each undeclared identifier is reported only once for each function it appears in arch/x86/mm/pat/set_memory.c:100:19: error: 'DIRECT_MAP_1G_SPLIT' undeclared (first use in this function) 100 | count_vm_event(DIRECT_MAP_1G_SPLIT); | ^~~~~~~~~~~~~~~~~~~ vim +/DIRECT_MAP_2M_SPLIT +95 arch/x86/mm/pat/set_memory.c 89 90 void update_split_page_event_count(int level) 91 { 92 if (system_state == SYSTEM_RUNNING) { 93 if (level == PG_LEVEL_2M) { 94 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE) 96 #else 97 count_vm_event(DIRECT_MAP_4M_SPLIT); 98 #endif 99 } else if (level == PG_LEVEL_1G) { 100 count_vm_event(DIRECT_MAP_1G_SPLIT); 101 } 102 } 103 } 104 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org