[android-common:android15-6.6-2026-07 1/1] mm/memory.c:95:2: warning: Unfortunate NUMA and NUMA Balancing config, growing page-frame for last_cpupid.

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

Hi Xiaofeng,

FYI, the error/warning still remains.

tree:   https://android.googlesource.com/kernel/common android15-6.6-2026-07
head:   5556e039c32fa02b239611dc8e5ebb958a7f12e1
commit: 2729133c1b5b2ed86b546b4c096ba101ec9141db [1/1] ANDROID: GKI: Add pageflags for OEM
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20260702/202607021146.c2GuuGHT-lkp@intel.com/config)
compiler: clang version 22.1.3 (https://github.com/llvm/llvm-project e9846648fd6183ee6d8cbdb4502213fcf902a211)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260702/202607021146.c2GuuGHT-lkp@intel.com/reproduce)

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/202607021146.c2GuuGHT-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from mm/memory.c:43:
   In file included from include/linux/mm.h:2222:
   include/linux/vmstat.h:508:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     508 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     509 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:515:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     515 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     516 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   include/linux/vmstat.h:527:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     527 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     528 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:536:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     536 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     537 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   In file included from mm/memory.c:44:
   include/linux/mm_inline.h:46:41: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
      46 |         __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
         |                                    ~~~~~~~~~~~ ^ ~~~
   include/linux/mm_inline.h:48:22: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
      48 |                                 NR_ZONE_LRU_BASE + lru, nr_pages);
         |                                 ~~~~~~~~~~~~~~~~ ^ ~~~
>> mm/memory.c:95:2: warning: Unfortunate NUMA and NUMA Balancing config, growing page-frame for last_cpupid. [-W#warnings]
      95 | #warning Unfortunate NUMA and NUMA Balancing config, growing page-frame for last_cpupid.
         |  ^
   8 warnings generated.


vim +95 mm/memory.c

42b7772812d15b Jan Beulich    2008-07-23  93  
af27d9403f5b80 Arnd Bergmann  2018-02-16  94  #if defined(LAST_CPUPID_NOT_IN_PAGE_FLAGS) && !defined(CONFIG_COMPILE_TEST)
90572890d20252 Peter Zijlstra 2013-10-07 @95  #warning Unfortunate NUMA and NUMA Balancing config, growing page-frame for last_cpupid.
75980e97daccfc Peter Zijlstra 2013-02-22  96  #endif
75980e97daccfc Peter Zijlstra 2013-02-22  97  

:::::: The code at line 95 was first introduced by commit
:::::: 90572890d202527c366aa9489b32404e88a7c020 mm: numa: Change page last {nid,pid} into {cpu,pid}

:::::: TO: Peter Zijlstra <peterz@infradead.org>
:::::: CC: Ingo Molnar <mingo@kernel.org>

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