[android-common:android16-6.12 0/2] mm/vmscan.c:5285:59: error: 'root_mem_cgroup' undeclared; did you mean 'parent_mem_cgroup'?

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

tree:   https://android.googlesource.com/kernel/common android16-6.12
head:   c7ad8c94d6193bff72b385b1cf3fb753de09f780
commit: aa438a63587f2d9dc1888265365ff3de338ba16f [0/2] ANDROID: mm: mglru: invoke root shrinker before memcg-specific ones
config: x86_64-randconfig-2101-20261008 (https://download.01.org/0day-ci/archive/20261008/202610080912.dCrKVMaZ-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261008/202610080912.dCrKVMaZ-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/202610080912.dCrKVMaZ-lkp@intel.com/

All errors (new ones prefixed by >>):

   mm/vmscan.c:4695:6: warning: no previous prototype for 'isolate_folio' [-Wmissing-prototypes]
    4695 | bool isolate_folio(struct lruvec *lruvec, struct folio *folio, struct scan_control *sc)
         |      ^~~~~~~~~~~~~
   mm/vmscan.c: In function 'lru_gen_shrink_node':
>> mm/vmscan.c:5285:59: error: 'root_mem_cgroup' undeclared (first use in this function); did you mean 'parent_mem_cgroup'?
    5285 |                 shrink_slab(sc->gfp_mask, pgdat->node_id, root_mem_cgroup,
         |                                                           ^~~~~~~~~~~~~~~
         |                                                           parent_mem_cgroup
   mm/vmscan.c:5285:59: note: each undeclared identifier is reported only once for each function it appears in


vim +5285 mm/vmscan.c

  5255	
  5256	static void lru_gen_shrink_node(struct pglist_data *pgdat, struct scan_control *sc)
  5257	{
  5258		struct blk_plug plug;
  5259		unsigned long reclaimed = sc->nr_reclaimed;
  5260	
  5261		VM_WARN_ON_ONCE(!root_reclaim(sc));
  5262	
  5263		/*
  5264		 * Unmapped clean folios are already prioritized. Scanning for more of
  5265		 * them is likely futile and can cause high reclaim latency when there
  5266		 * is a large number of memcgs.
  5267		 */
  5268		if (!sc->may_writepage || !sc->may_unmap)
  5269			goto done;
  5270	
  5271		lru_add_drain();
  5272	
  5273		blk_start_plug(&plug);
  5274	
  5275		set_mm_walk(pgdat, sc->proactive);
  5276	
  5277		set_initial_priority(pgdat, sc);
  5278	
  5279		if (current_is_kswapd())
  5280			sc->nr_reclaimed = 0;
  5281	
  5282		if (mem_cgroup_disabled()) {
  5283			shrink_one(&pgdat->__lruvec, sc);
  5284		} else {
> 5285			shrink_slab(sc->gfp_mask, pgdat->node_id, root_mem_cgroup,
  5286				    sc->priority);
  5287			if (sc->nr_reclaimed < sc->nr_to_reclaim)
  5288				shrink_many(pgdat, sc);
  5289		}
  5290		if (current_is_kswapd())
  5291			sc->nr_reclaimed += reclaimed;
  5292	
  5293		clear_mm_walk();
  5294	
  5295		blk_finish_plug(&plug);
  5296	done:
  5297		if (sc->nr_reclaimed > reclaimed)
  5298			pgdat->kswapd_failures = 0;
  5299	}
  5300	

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