[vbabka:objext_split 9/14] mm/slab.h:664:45: error: 'struct slabobj_ext' has no member named '_objcg'

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

Hi Vlastimil,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vbabka/linux.git objext_split
head:   8bd682e28958694beba958e2a3af94c6e1789819
commit: 0be66c218c46f308612a25af648bda07e7f4c8c3 [9/14] mm/slab: abstract obj_ext.objcg access
config: arc-randconfig-002-20260709 (https://download.01.org/0day-ci/archive/20260709/202607091705.XjP7d8IF-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260709/202607091705.XjP7d8IF-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/202607091705.XjP7d8IF-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from mm/slab_common.c:35:
   mm/slab.h: In function 'slab_obj_ext_get_objcg':
>> mm/slab.h:664:45: error: 'struct slabobj_ext' has no member named '_objcg'
     objcg = slab_obj_ext(slab, obj_exts, index)->_objcg;
                                                ^~
   mm/slab.h: In function 'slab_obj_ext_set_objcg':
   mm/slab.h:685:21: error: 'struct slabobj_ext' has no member named '_objcg'
     objcg_old = obj_ext->_objcg;
                        ^~
   mm/slab.h:688:10: error: 'struct slabobj_ext' has no member named '_objcg'
      obj_ext->_objcg = objcg_new;
             ^~


vim +664 mm/slab.h

   654	
   655	static inline struct obj_cgroup *slab_obj_ext_get_objcg(struct slab *slab,
   656						unsigned long obj_exts, void *obj)
   657	{
   658		struct obj_cgroup *objcg;
   659		unsigned int index;
   660	
   661		index = obj_to_index(slab->slab_cache, slab, obj);
   662	
   663		get_slab_obj_exts(obj_exts);
 > 664		objcg = slab_obj_ext(slab, obj_exts, index)->_objcg;
   665		put_slab_obj_exts(obj_exts);
   666	
   667		return objcg;
   668	}
   669	

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