[akpm-mm:mm-unstable 27/106] mm/page_io.c:220:3: error: call to undeclared function 'count_objcg_events'; ISO C99 and later do not support implicit function declarations

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
head:   7994b7ea6ac880efd0c38fedfbffd5ab8b1b7b2b
commit: c10966f19a878a66206327ebe3b85500f59f47e2 [27/106] mm: count zeromap read and set for swapout and swapin
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20241106/202411062130.JXvq8Cjt-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241106/202411062130.JXvq8Cjt-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/202411062130.JXvq8Cjt-lkp@intel.com/

Note: the akpm-mm/mm-unstable HEAD 7994b7ea6ac880efd0c38fedfbffd5ab8b1b7b2b builds fine.
      It only hurts bisectability.

All errors (new ones prefixed by >>):

   In file included from mm/page_io.c:14:
   In file included from include/linux/mm.h:2213:
   include/linux/vmstat.h:504:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     504 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     505 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:511:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     511 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     512 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   include/linux/vmstat.h:524:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     524 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     525 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
>> mm/page_io.c:220:3: error: call to undeclared function 'count_objcg_events'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     220 |                 count_objcg_events(objcg, SWPOUT_ZERO, nr_pages);
         |                 ^
   mm/page_io.c:220:3: note: did you mean 'count_objcg_event'?
   include/linux/memcontrol.h:1763:20: note: 'count_objcg_event' declared here
    1763 | static inline void count_objcg_event(struct obj_cgroup *objcg,
         |                    ^
   mm/page_io.c:532:3: error: call to undeclared function 'count_objcg_events'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     532 |                 count_objcg_events(objcg, SWPIN_ZERO, nr_pages);
         |                 ^
   4 warnings and 2 errors generated.


vim +/count_objcg_events +220 mm/page_io.c

   204	
   205	static void swap_zeromap_folio_set(struct folio *folio)
   206	{
   207		struct obj_cgroup *objcg = get_obj_cgroup_from_folio(folio);
   208		struct swap_info_struct *sis = swp_swap_info(folio->swap);
   209		int nr_pages = folio_nr_pages(folio);
   210		swp_entry_t entry;
   211		unsigned int i;
   212	
   213		for (i = 0; i < folio_nr_pages(folio); i++) {
   214			entry = page_swap_entry(folio_page(folio, i));
   215			set_bit(swp_offset(entry), sis->zeromap);
   216		}
   217	
   218		count_vm_events(SWPOUT_ZERO, nr_pages);
   219		if (objcg) {
 > 220			count_objcg_events(objcg, SWPOUT_ZERO, nr_pages);
   221			obj_cgroup_put(objcg);
   222		}
   223	}
   224	

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