Re: [PATCH v2] memcg: workingset: remove folio_memcg_rcu usage

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

Hi Shakeel,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on linus/master v6.12-rc4 next-20241025]
[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/Shakeel-Butt/memcg-workingset-remove-folio_memcg_rcu-usage/20241027-003815
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20241026163707.2479526-1-shakeel.butt%40linux.dev
patch subject: [PATCH v2] memcg: workingset: remove folio_memcg_rcu usage
config: x86_64-allnoconfig (https://download.01.org/0day-ci/archive/20241027/202410271328.q4gVeNsh-lkp@intel.com/config)
compiler: clang version 19.1.2 (https://github.com/llvm/llvm-project 7ba7d8e2f7b6445b60679da826210cdde29eaf8b)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241027/202410271328.q4gVeNsh-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/202410271328.q4gVeNsh-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from mm/workingset.c:8:
   In file included from include/linux/memcontrol.h:21:
   In file included from include/linux/mm.h:2213:
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from mm/workingset.c:9:
   include/linux/mm_inline.h:47:41: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
      47 |         __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
         |                                    ~~~~~~~~~~~ ^ ~~~
   include/linux/mm_inline.h:49:22: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
      49 |                                 NR_ZONE_LRU_BASE + lru, nr_pages);
         |                                 ~~~~~~~~~~~~~~~~ ^ ~~~
>> mm/workingset.c:598:31: error: call to undeclared function 'folio_memcg_charged'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     598 |         if (mem_cgroup_disabled() || folio_memcg_charged(folio))
         |                                      ^
   mm/workingset.c:598:31: note: did you mean 'folio_memcg_check'?
   include/linux/memcontrol.h:1058:34: note: 'folio_memcg_check' declared here
    1058 | static inline struct mem_cgroup *folio_memcg_check(struct folio *folio)
         |                                  ^
   3 warnings and 1 error generated.


vim +/folio_memcg_charged +598 mm/workingset.c

   587	
   588	/**
   589	 * workingset_activation - note a page activation
   590	 * @folio: Folio that is being activated.
   591	 */
   592	void workingset_activation(struct folio *folio)
   593	{
   594		/*
   595		 * Filter non-memcg pages here, e.g. unmap can call
   596		 * mark_page_accessed() on VDSO pages.
   597		 */
 > 598		if (mem_cgroup_disabled() || folio_memcg_charged(folio))
   599			workingset_age_nonresident(folio_lruvec(folio), folio_nr_pages(folio));
   600	}
   601	

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