Re: [PATCH 5/8] mm/zsmalloc,zswap: Redirect zswap_entry->obcg to zpdesc

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

Hi Joshua,

kernel test robot noticed the following build errors:

[auto build test ERROR on axboe/for-next]
[also build test ERROR on linus/master v7.0-rc1 next-20260226]
[cannot apply to akpm-mm/mm-everything]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Joshua-Hahn/mm-zsmalloc-Rename-zs_object_copy-to-zs_obj_copy/20260227-033239
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux.git for-next
patch link:    https://lore.kernel.org/r/20260226192936.3190275-6-joshua.hahnjy%40gmail.com
patch subject: [PATCH 5/8] mm/zsmalloc,zswap: Redirect zswap_entry->obcg to zpdesc
config: x86_64-buildonly-randconfig-004-20260227 (https://download.01.org/0day-ci/archive/20260227/202602270738.SxqPEs3Q-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/20260227/202602270738.SxqPEs3Q-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/202602270738.SxqPEs3Q-lkp@intel.com/

All errors (new ones prefixed by >>):

   mm/zswap.c: In function 'zswap_lru_add':
>> mm/zswap.c:626:25: error: implicit declaration of function 'obj_cgroup_memcg'; did you mean 'obj_cgroup_get'? [-Wimplicit-function-declaration]
     626 |         memcg = objcg ? obj_cgroup_memcg(objcg) : NULL;
         |                         ^~~~~~~~~~~~~~~~
         |                         obj_cgroup_get
>> mm/zswap.c:626:49: error: pointer/integer type mismatch in conditional expression [-Wint-conversion]
     626 |         memcg = objcg ? obj_cgroup_memcg(objcg) : NULL;
         |                                                 ^
   mm/zswap.c: In function 'zswap_lru_del':
   mm/zswap.c:639:49: error: pointer/integer type mismatch in conditional expression [-Wint-conversion]
     639 |         memcg = objcg ? obj_cgroup_memcg(objcg) : NULL;
         |                                                 ^


vim +626 mm/zswap.c

   607	
   608	static void zswap_lru_add(struct list_lru *list_lru, struct zswap_entry *entry,
   609				  struct obj_cgroup *objcg)
   610	{
   611		int nid = entry_to_nid(entry);
   612		struct mem_cgroup *memcg;
   613	
   614		/*
   615		 * Note that it is safe to use rcu_read_lock() here, even in the face of
   616		 * concurrent memcg offlining:
   617		 *
   618		 * 1. list_lru_add() is called before list_lru_one is dead. The
   619		 *    new entry will be reparented to memcg's parent's list_lru.
   620		 * 2. list_lru_add() is called after list_lru_one is dead. The
   621		 *    new entry will be added directly to memcg's parent's list_lru.
   622		 *
   623		 * Similar reasoning holds for list_lru_del().
   624		 */
   625		rcu_read_lock();
 > 626		memcg = objcg ? obj_cgroup_memcg(objcg) : NULL;
   627		/* will always succeed */
   628		list_lru_add(list_lru, &entry->lru, nid, memcg);
   629		rcu_read_unlock();
   630	}
   631	

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