[rgushchin:memcontrol_v1.1 4/5] mm/internal.h:1527:17: error: implicit declaration of function 'cgroup_subsys_on_dfl'

[rgushchin:memcontrol_v1.1 4/5] mm/internal.h:1527:17: error: implicit declaration of function 'cgroup_subsys_on_dfl'

[kernel test robot]

tree:   https://github.com/rgushchin/linux.git memcontrol_v1.1
head:   9a677688ef8b39a000f682ac9bfb46453fd94685
commit: 8725b3ac18d0ce3a4cba970cfd0d28286a0b182e [4/5] mm: memcg: move legacy memcg event code into memcontrol-v1.c
config: arc-allnoconfig (https://download.01.org/0day-ci/archive/20240508/202405081104.FJFLLCna-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240508/202405081104.FJFLLCna-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/202405081104.FJFLLCna-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from mm/filemap.c:51:
   mm/internal.h: In function 'do_memsw_account':
>> mm/internal.h:1527:17: error: implicit declaration of function 'cgroup_subsys_on_dfl' [-Werror=implicit-function-declaration]
    1527 |         return !cgroup_subsys_on_dfl(memory_cgrp_subsys);
         |                 ^~~~~~~~~~~~~~~~~~~~
>> mm/internal.h:1527:38: error: 'memory_cgrp_subsys' undeclared (first use in this function)
    1527 |         return !cgroup_subsys_on_dfl(memory_cgrp_subsys);
         |                                      ^~~~~~~~~~~~~~~~~~
   mm/internal.h:1527:38: note: each undeclared identifier is reported only once for each function it appears in
   cc1: some warnings being treated as errors
--
   In file included from mm/page-writeback.c:43:
   mm/internal.h: In function 'do_memsw_account':
>> mm/internal.h:1527:17: error: implicit declaration of function 'cgroup_subsys_on_dfl' [-Werror=implicit-function-declaration]
    1527 |         return !cgroup_subsys_on_dfl(memory_cgrp_subsys);
         |                 ^~~~~~~~~~~~~~~~~~~~
>> mm/internal.h:1527:38: error: 'memory_cgrp_subsys' undeclared (first use in this function)
    1527 |         return !cgroup_subsys_on_dfl(memory_cgrp_subsys);
         |                                      ^~~~~~~~~~~~~~~~~~
   mm/internal.h:1527:38: note: each undeclared identifier is reported only once for each function it appears in
   mm/page-writeback.c: In function 'cgwb_calc_thresh':
   mm/page-writeback.c:900:39: warning: variable 'gdtc' set but not used [-Wunused-but-set-variable]
     900 |         struct dirty_throttle_control gdtc = { GDTC_INIT_NO_WB };
         |                                       ^~~~
   cc1: some warnings being treated as errors
--
   In file included from mm/slub.c:49:
   mm/internal.h: In function 'do_memsw_account':
>> mm/internal.h:1527:17: error: implicit declaration of function 'cgroup_subsys_on_dfl' [-Werror=implicit-function-declaration]
    1527 |         return !cgroup_subsys_on_dfl(memory_cgrp_subsys);
         |                 ^~~~~~~~~~~~~~~~~~~~
>> mm/internal.h:1527:38: error: 'memory_cgrp_subsys' undeclared (first use in this function)
    1527 |         return !cgroup_subsys_on_dfl(memory_cgrp_subsys);
         |                                      ^~~~~~~~~~~~~~~~~~
   mm/internal.h:1527:38: note: each undeclared identifier is reported only once for each function it appears in
   mm/slub.c: In function 'slab_post_alloc_hook':
   mm/slub.c:3831:29: warning: variable 'obj_exts' set but not used [-Wunused-but-set-variable]
    3831 |         struct slabobj_ext *obj_exts;
         |                             ^~~~~~~~
   cc1: some warnings being treated as errors


vim +/cgroup_subsys_on_dfl +1527 mm/internal.h

  1523	
  1524	/* Whether legacy memory+swap accounting is active */
  1525	static inline bool do_memsw_account(void)
  1526	{
> 1527		return !cgroup_subsys_on_dfl(memory_cgrp_subsys);
  1528	}
  1529	

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