[akpm-mm:mm-unstable 328/329] mm/page_alloc.c:421:3: error: call to undeclared function 'in_mem_hotplug'; ISO C99 and later do not support implicit function declarations

[akpm-mm:mm-unstable 328/329] mm/page_alloc.c:421:3: error: call to undeclared function 'in_mem_hotplug'; ISO C99 and later do not support implicit function declarations

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
head:   5f089a9aa987ccf72df0c6955e168e865f280603
commit: b4cfcc26f507ecef2861ccfb883698933083fce6 [328/329] mm/page_alloc: add lockdep assertion for pageblock type change
config: arm64-randconfig-003-20250301 (https://download.01.org/0day-ci/archive/20250301/202503011224.Gak85jxJ-lkp@intel.com/config)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250301/202503011224.Gak85jxJ-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/202503011224.Gak85jxJ-lkp@intel.com/

All errors (new ones prefixed by >>):

>> mm/page_alloc.c:421:3: error: call to undeclared function 'in_mem_hotplug'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
                   in_mem_hotplug() ||
                   ^
   1 error generated.


vim +/in_mem_hotplug +421 mm/page_alloc.c

   417	
   418	void set_pageblock_migratetype(struct page *page, int migratetype)
   419	{
   420		lockdep_assert_once(system_state == SYSTEM_BOOTING ||
 > 421			in_mem_hotplug() ||
   422			lockdep_is_held(&page_zone(page)->lock));
   423	
   424		if (unlikely(page_group_by_mobility_disabled &&
   425			     migratetype < MIGRATE_PCPTYPES))
   426			migratetype = MIGRATE_UNMOVABLE;
   427	
   428		set_pfnblock_flags_mask(page, (unsigned long)migratetype,
   429					page_to_pfn(page), MIGRATETYPE_MASK);
   430	}
   431	

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