[gourryinverse:scratch/gourry/managed_nodes/node_features_v6 18/37] mm/gup.c:2418:21: error: implicit declaration of function 'folio_longterm_pin_forbidden'

tree:   https://github.com/gourryinverse/linux scratch/gourry/managed_nodes/node_features_v6
head:   2a91be748ebcfd653985fa1c6c41371d45953e93
commit: b44aca34818ebf7e2ef962e85b23c05bb7882c05 [18/37] mm: add N_MEMORY_LTPIN node state for longterm-pin eligible nodes
config: alpha-allmodconfig (https://download.01.org/0day-ci/archive/20260731/[email protected]/config)
compiler: alpha-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260731/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

   mm/gup.c: In function 'pofs_has_ltpin_forbidden':
>> mm/gup.c:2418:21: error: implicit declaration of function 'folio_longterm_pin_forbidden' [-Wimplicit-function-declaration]
    2418 |                 if (folio_longterm_pin_forbidden(folio))
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/folio_longterm_pin_forbidden +2418 mm/gup.c

  2409	
  2410	/* True if any folio sits on a node that doesn't support longterm pinning */
  2411	static bool pofs_has_ltpin_forbidden(struct pages_or_folios *pofs)
  2412	{
  2413		struct folio *folio;
  2414		long i = 0;
  2415	
  2416		for (folio = pofs_get_folio(pofs, i); folio;
  2417		     folio = pofs_next_folio(folio, pofs, &i)) {
> 2418			if (folio_longterm_pin_forbidden(folio))
  2419				return true;
  2420		}
  2421		return false;
  2422	}
  2423	

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