include/linux/huge_mm.h:285:undefined reference to `mthp_stats'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   c760b3725e52403dc1b28644fb09c47a83cacea6
commit: ec33687c674934dfefd782a8ffd58370b080b503 mm: add per-order mTHP anon_fault_alloc and anon_fault_fallback counters
date:   2 weeks ago
config: s390-randconfig-r005-20230226 (https://download.01.org/0day-ci/archive/20240523/202405231728.tCAogiSI-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240523/202405231728.tCAogiSI-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/202405231728.tCAogiSI-lkp@intel.com/

All errors (new ones prefixed by >>):

   s390-linux-ld: mm/memory.o: in function `count_mthp_stat':
>> include/linux/huge_mm.h:285:(.text+0x191c): undefined reference to `mthp_stats'
   s390-linux-ld: mm/huge_memory.o:(.rodata+0x10): undefined reference to `mthp_stats'


vim +285 include/linux/huge_mm.h

   279	
   280	static inline void count_mthp_stat(int order, enum mthp_stat_item item)
   281	{
   282		if (order <= 0 || order > PMD_ORDER)
   283			return;
   284	
 > 285		this_cpu_inc(mthp_stats.stats[order][item]);
   286	}
   287	

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