Re: [PATCH 1/2] zswap: make shrinking memcg-aware

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

Hi Nhat,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on linus/master v6.6-rc1 next-20230914]
[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/Nhat-Pham/zswap-make-shrinking-memcg-aware/20230912-004147
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20230911164024.2541401-2-nphamcs%40gmail.com
patch subject: [PATCH 1/2] zswap: make shrinking memcg-aware
config: loongarch-randconfig-001-20230914 (https://download.01.org/0day-ci/archive/20230914/202309141736.ABab8fuf-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230914/202309141736.ABab8fuf-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/202309141736.ABab8fuf-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   mm/zswap.c: In function 'zswap_lru_add':
>> mm/zswap.c:320:17: error: implicit declaration of function 'get_mem_cgroup_from_objcg'; did you mean 'get_mem_cgroup_from_mm'? [-Werror=implicit-function-declaration]
     320 |                 get_mem_cgroup_from_objcg(entry->objcg) : NULL;
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~
         |                 get_mem_cgroup_from_mm
>> mm/zswap.c:320:57: warning: pointer/integer type mismatch in conditional expression
     320 |                 get_mem_cgroup_from_objcg(entry->objcg) : NULL;
         |                                                         ^
   mm/zswap.c: In function 'zswap_lru_del':
   mm/zswap.c:330:57: warning: pointer/integer type mismatch in conditional expression
     330 |                 get_mem_cgroup_from_objcg(entry->objcg) : NULL;
         |                                                         ^
   mm/zswap.c: In function 'shrink_memcg_cb':
   mm/zswap.c:694:80: warning: pointer/integer type mismatch in conditional expression
     694 |                 memcg = entry->objcg ? get_mem_cgroup_from_objcg(entry->objcg) : NULL;
         |                                                                                ^
   mm/zswap.c: In function 'shrink_worker':
>> mm/zswap.c:758:51: error: invalid use of undefined type 'struct mem_cgroup'
     758 |                         css_put(&pool->next_shrink->css);
         |                                                   ^~
   mm/zswap.c: In function 'zswap_pool_destroy':
   mm/zswap.c:906:43: error: invalid use of undefined type 'struct mem_cgroup'
     906 |                 css_put(&pool->next_shrink->css);
         |                                           ^~
   mm/zswap.c: In function 'zswap_store':
>> mm/zswap.c:1298:23: warning: assignment to 'struct mem_cgroup *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
    1298 |                 memcg = get_mem_cgroup_from_objcg(objcg);
         |                       ^
   mm/zswap.c:1300:39: error: invalid use of undefined type 'struct mem_cgroup'
    1300 |                         css_put(&memcg->css);
         |                                       ^~
   mm/zswap.c:1303:31: error: invalid use of undefined type 'struct mem_cgroup'
    1303 |                 css_put(&memcg->css);
         |                               ^~
   mm/zswap.c:1349:23: warning: assignment to 'struct mem_cgroup *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
    1349 |                 memcg = get_mem_cgroup_from_objcg(objcg);
         |                       ^
   mm/zswap.c:1351:31: error: invalid use of undefined type 'struct mem_cgroup'
    1351 |                 css_put(&memcg->css);
         |                               ^~
   cc1: some warnings being treated as errors


vim +320 mm/zswap.c

   313	
   314	/*********************************
   315	* lru functions
   316	**********************************/
   317	static bool zswap_lru_add(struct list_lru *list_lru, struct zswap_entry *entry)
   318	{
   319		struct mem_cgroup *memcg = entry->objcg ?
 > 320			get_mem_cgroup_from_objcg(entry->objcg) : NULL;
   321		bool added = __list_lru_add(list_lru, &entry->lru, entry->nid, memcg);
   322	
   323		mem_cgroup_put(memcg);
   324		return added;
   325	}
   326	

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