[android-common:android13-5.15 1/1] mm/vmscan.c:4613:6: warning: no previous prototype for function 'isolate_page'

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

Hi yipeng,

FYI, the error/warning still remains.

tree:   https://android.googlesource.com/kernel/common android13-5.15
head:   913096d07c824b4bc3fb781fc52d46fbf33dd00a
commit: 54677afc8eb1da47f2eebb6f5c810cd4b6db23dc [1/1] ANDROID: mm: export isolate_folio and reclaim_pages
config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20251231/202512312322.RLaJAoOw-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project f43d6834093b19baf79beda8c0337ab020ac5f17)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251231/202512312322.RLaJAoOw-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/202512312322.RLaJAoOw-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from <built-in>:3:
   In file included from include/linux/compiler_types.h:80:
   include/linux/compiler-clang.h:24:9: warning: '__SANITIZE_ADDRESS__' macro redefined [-Wmacro-redefined]
      24 | #define __SANITIZE_ADDRESS__
         |         ^
   <built-in>:368:9: note: previous definition is here
     368 | #define __SANITIZE_ADDRESS__ 1
         |         ^
   mm/vmscan.c:917:15: warning: no previous prototype for function 'shrink_slab' [-Wmissing-prototypes]
     917 | unsigned long shrink_slab(gfp_t gfp_mask, int nid,
         |               ^
   mm/vmscan.c:917:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     917 | unsigned long shrink_slab(gfp_t gfp_mask, int nid,
         | ^
         | static 
   mm/vmscan.c:1391:6: warning: variable 'err' set but not used [-Wunused-but-set-variable]
    1391 |         int err;
         |             ^
>> mm/vmscan.c:4613:6: warning: no previous prototype for function 'isolate_page' [-Wmissing-prototypes]
    4613 | bool isolate_page(struct lruvec *lruvec, struct page *page, struct scan_control *sc)
         |      ^
   mm/vmscan.c:4613:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    4613 | bool isolate_page(struct lruvec *lruvec, struct page *page, struct scan_control *sc)
         | ^
         | static 
   4 warnings generated.


vim +/isolate_page +4613 mm/vmscan.c

  4612	
> 4613	bool isolate_page(struct lruvec *lruvec, struct page *page, struct scan_control *sc)
  4614	{
  4615		bool success;
  4616	
  4617		/* unmapping inhibited */
  4618		if (!sc->may_unmap && page_mapped(page))
  4619			return false;
  4620	
  4621		/* swapping inhibited */
  4622		if (!(sc->may_writepage && (sc->gfp_mask & __GFP_IO)) &&
  4623		    (PageDirty(page) ||
  4624		     (PageAnon(page) && !PageSwapCache(page))))
  4625			return false;
  4626	
  4627		/* raced with release_pages() */
  4628		if (!get_page_unless_zero(page))
  4629			return false;
  4630	
  4631		/* raced with another isolation */
  4632		if (!TestClearPageLRU(page)) {
  4633			put_page(page);
  4634			return false;
  4635		}
  4636	
  4637		/* see the comment on MAX_NR_TIERS */
  4638		if (!PageReferenced(page))
  4639			set_mask_bits(&page->flags, LRU_REFS_MASK | LRU_REFS_FLAGS, 0);
  4640	
  4641		/* for shrink_page_list() */
  4642		ClearPageReclaim(page);
  4643		ClearPageReferenced(page);
  4644	
  4645		success = lru_gen_del_page(lruvec, page, true);
  4646		VM_WARN_ON_ONCE_PAGE(!success, page);
  4647	
  4648		return true;
  4649	}
  4650	EXPORT_SYMBOL_GPL(isolate_page);
  4651	

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