Hi Michal, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: 89f3a2595f2e3f14f976811d203bd8f55ff4eada commit: 2f5f99f3efc5d34c37f9918c50808a4cfe36c211 [1659/1659] mm: handle uninitialized numa nodes gracefully config: x86_64-buildonly-randconfig-002-20250606 (https://download.01.org/0day-ci/archive/20250606/202506061755.yar1Fr9d-lkp@i...) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250606/202506061755.yar1Fr9d-lkp@i...) 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/202506061755.yar1Fr9d-lkp@intel.com/ All warnings (new ones prefixed by >>): mm/memory_hotplug.c: In function '__remove_section': mm/memory_hotplug.c:481:23: warning: variable 'start_pfn' set but not used [-Wunused-but-set-variable] 481 | unsigned long start_pfn; | ^~~~~~~~~ mm/memory_hotplug.c: In function 'hotadd_init_pgdat': mm/memory_hotplug.c:926:23: warning: unused variable 'start_pfn' [-Wunused-variable] 926 | unsigned long start_pfn = PFN_DOWN(start); | ^~~~~~~~~ mm/memory_hotplug.c: At top level:

...

mm/memory_hotplug.c:971:13: warning: 'rollback_node_hotadd' defined but not used [-Wunused-function] 971 | static void rollback_node_hotadd(int nid) | ^~~~~~~~~~~~~~~~~~~~

vim +/rollback_node_hotadd +971 mm/memory_hotplug.c 9af3c2dea3a3ae Yasunori Goto 2006-06-27 970 b9ff036082cd17 Oscar Salvador 2018-08-17 @971 static void rollback_node_hotadd(int nid) 9af3c2dea3a3ae Yasunori Goto 2006-06-27 972 { b9ff036082cd17 Oscar Salvador 2018-08-17 973 pg_data_t *pgdat = NODE_DATA(nid); b9ff036082cd17 Oscar Salvador 2018-08-17 974 9af3c2dea3a3ae Yasunori Goto 2006-06-27 975 arch_refresh_nodedata(nid, NULL); 5830169f47269f Reza Arbab 2016-08-11 976 free_percpu(pgdat->per_cpu_nodestats); 9af3c2dea3a3ae Yasunori Goto 2006-06-27 977 arch_free_nodedata(pgdat); 9af3c2dea3a3ae Yasunori Goto 2006-06-27 978 return; 9af3c2dea3a3ae Yasunori Goto 2006-06-27 979 } 9af3c2dea3a3ae Yasunori Goto 2006-06-27 980 :::::: The code at line 971 was first introduced by commit :::::: b9ff036082cd1793a59b35c4432644fe44620664 mm/memory_hotplug.c: make add_memory_resource use __try_online_node :::::: TO: Oscar Salvador <osalvador@suse.de> :::::: CC: Linus Torvalds <torvalds@linux-foundation.org> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki