[android-common:android16-6.12 2/2] mm/vmscan.c:4372:6: warning: no previous prototype for 'isolate_folio'

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

tree:   https://android.googlesource.com/kernel/common android16-6.12
head:   51fe955bf6dfda4550402c3f4335814f77b4e297
commit: 0e47a7391b3e2e57c4769f14a7be0ba7b56b10ca [2/2] ANDROID: mm: export isolate_folio and reclaim_pages
config: i386-buildonly-randconfig-006-20250124 (https://download.01.org/0day-ci/archive/20250124/202501240645.ysfaM2ej-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250124/202501240645.ysfaM2ej-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/202501240645.ysfaM2ej-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/vmscan.c:4372:6: warning: no previous prototype for 'isolate_folio' [-Wmissing-prototypes]
    4372 | bool isolate_folio(struct lruvec *lruvec, struct folio *folio, struct scan_control *sc)
         |      ^~~~~~~~~~~~~


vim +/isolate_folio +4372 mm/vmscan.c

  4371	
> 4372	bool isolate_folio(struct lruvec *lruvec, struct folio *folio, struct scan_control *sc)
  4373	{
  4374		bool success;
  4375	
  4376		/* swap constrained */
  4377		if (!(sc->gfp_mask & __GFP_IO) &&
  4378		    (folio_test_dirty(folio) ||
  4379		     (folio_test_anon(folio) && !folio_test_swapcache(folio))))
  4380			return false;
  4381	
  4382		/* raced with release_pages() */
  4383		if (!folio_try_get(folio))
  4384			return false;
  4385	
  4386		/* raced with another isolation */
  4387		if (!folio_test_clear_lru(folio)) {
  4388			folio_put(folio);
  4389			return false;
  4390		}
  4391	
  4392		/* see the comment on MAX_NR_TIERS */
  4393		if (!folio_test_referenced(folio))
  4394			set_mask_bits(&folio->flags, LRU_REFS_MASK | LRU_REFS_FLAGS, 0);
  4395	
  4396		/* for shrink_folio_list() */
  4397		folio_clear_reclaim(folio);
  4398		folio_clear_referenced(folio);
  4399	
  4400		success = lru_gen_del_folio(lruvec, folio, true);
  4401		VM_WARN_ON_ONCE_FOLIO(!success, folio);
  4402	
  4403		return true;
  4404	}
  4405	EXPORT_SYMBOL_GPL(isolate_folio);
  4406	

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