[akpm-mm:mm-unstable 51/162] mm/zswap.c:708:17: error: implicit declaration of function 'obj_cgroup_report_zswap_wb'; did you mean 'obj_cgroup_charge_zswap'?

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
head:   3e8f171b80668501d4715af47563b31b969c94da
commit: cfa9143b9f60ce4a760c154557807a8570fc1b27 [51/162] mm: memcg: add per-memcg zswap writeback stat
config: sparc-randconfig-001-20231019 (https://download.01.org/0day-ci/archive/20231020/202310200057.UDmkbOVO-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231020/202310200057.UDmkbOVO-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/202310200057.UDmkbOVO-lkp@intel.com/

All errors (new ones prefixed by >>):

   mm/zswap.c: In function 'shrink_memcg_cb':
>> mm/zswap.c:708:17: error: implicit declaration of function 'obj_cgroup_report_zswap_wb'; did you mean 'obj_cgroup_charge_zswap'? [-Werror=implicit-function-declaration]
     708 |                 obj_cgroup_report_zswap_wb(entry->objcg);
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~
         |                 obj_cgroup_charge_zswap
   cc1: some warnings being treated as errors


vim +708 mm/zswap.c

   661	
   662	static enum lru_status shrink_memcg_cb(struct list_head *item, struct list_lru_one *l,
   663					       spinlock_t *lock, void *arg)
   664	{
   665		struct zswap_entry *entry = container_of(item, struct zswap_entry, lru);
   666		struct mem_cgroup *memcg;
   667		struct zswap_tree *tree;
   668		pgoff_t swpoffset;
   669		enum lru_status ret = LRU_REMOVED_RETRY;
   670		int writeback_result;
   671	
   672		/*
   673		 * Once the lru lock is dropped, the entry might get freed. The
   674		 * swpoffset is copied to the stack, and entry isn't deref'd again
   675		 * until the entry is verified to still be alive in the tree.
   676		 */
   677		swpoffset = swp_offset(entry->swpentry);
   678		tree = zswap_trees[swp_type(entry->swpentry)];
   679		list_lru_isolate(l, item);
   680		spin_unlock(lock);
   681	
   682		/* Check for invalidate() race */
   683		spin_lock(&tree->lock);
   684		if (entry != zswap_rb_search(&tree->rbroot, swpoffset)) {
   685			goto unlock;
   686		}
   687		/* Hold a reference to prevent a free during writeback */
   688		zswap_entry_get(entry);
   689		spin_unlock(&tree->lock);
   690	
   691		writeback_result = zswap_writeback_entry(entry, tree);
   692	
   693		spin_lock(&tree->lock);
   694		if (writeback_result) {
   695			zswap_reject_reclaim_fail++;
   696			memcg = get_mem_cgroup_from_entry(entry);
   697			spin_lock(lock);
   698			/* we cannot use zswap_lru_add here, because it increments node's lru count */
   699			list_lru_putback(&entry->pool->list_lru, item, entry_to_nid(entry), memcg);
   700			spin_unlock(lock);
   701			mem_cgroup_put(memcg);
   702			ret = LRU_RETRY;
   703			goto put_unlock;
   704		}
   705		zswap_written_back_pages++;
   706	
   707		if (entry->objcg)
 > 708			obj_cgroup_report_zswap_wb(entry->objcg);
   709	
   710		/*
   711		 * Writeback started successfully, the page now belongs to the
   712		 * swapcache. Drop the entry from zswap - unless invalidate already
   713		 * took it out while we had the tree->lock released for IO.
   714		 */
   715		zswap_invalidate_entry(tree, entry);
   716	
   717	put_unlock:
   718		/* Drop local reference */
   719		zswap_entry_put(tree, entry);
   720	unlock:
   721		spin_unlock(&tree->lock);
   722		spin_lock(lock);
   723		return ret;
   724	}
   725	

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