[vbabka:objext_split 12/14] mm/slab.h:720:46: error: 'slabobj_ext_idx_ctref' undeclared; did you mean 'slabobj_ext_idx_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: ac7896437e39eb47ba7cbf00c39915e87e04398f [12/14] mm/slab: change layout of struct slabobj_ext arrays
config: arm64-randconfig-002-20260709 (https://download.01.org/0day-ci/archive/20260709/202607091729.PhhcpvSA-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260709/202607091729.PhhcpvSA-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/202607091729.PhhcpvSA-lkp@intel.com/

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

   In file included from mm/slab_common.c:35:
   mm/slab.h: In function 'slab_obj_ext_codetag_ref':
>> mm/slab.h:720:46: error: 'slabobj_ext_idx_ctref' undeclared (first use in this function); did you mean 'slabobj_ext_idx_objcg'?
     return &slab_obj_ext(slab, obj_exts, index, slabobj_ext_idx_ctref)->_ctref;
                                                 ^~~~~~~~~~~~~~~~~~~~~
                                                 slabobj_ext_idx_objcg
   mm/slab.h:720:46: note: each undeclared identifier is reported only once for each function it appears in
   mm/slab.h: In function 'obj_ext_codetag_ref_start':
   mm/slab.h:731:19: error: 'slabobj_ext_idx_ctref' undeclared (first use in this function); did you mean 'slabobj_ext_idx_objcg'?
     return obj_ext + slabobj_ext_idx_ctref * slab->objects;
                      ^~~~~~~~~~~~~~~~~~~~~
                      slabobj_ext_idx_objcg
--
   In file included from mm/slub.c:23:
   mm/slab.h: In function 'slab_obj_ext_codetag_ref':
>> mm/slab.h:720:46: error: 'slabobj_ext_idx_ctref' undeclared (first use in this function); did you mean 'slabobj_ext_idx_objcg'?
     return &slab_obj_ext(slab, obj_exts, index, slabobj_ext_idx_ctref)->_ctref;
                                                 ^~~~~~~~~~~~~~~~~~~~~
                                                 slabobj_ext_idx_objcg
   mm/slab.h:720:46: note: each undeclared identifier is reported only once for each function it appears in
   mm/slab.h: In function 'obj_ext_codetag_ref_start':
   mm/slab.h:731:19: error: 'slabobj_ext_idx_ctref' undeclared (first use in this function); did you mean 'slabobj_ext_idx_objcg'?
     return obj_ext + slabobj_ext_idx_ctref * slab->objects;
                      ^~~~~~~~~~~~~~~~~~~~~
                      slabobj_ext_idx_objcg
>> mm/slab.h:732:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^
--
   In file included from mm/kasan/generic.c:37:
   mm/kasan/../slab.h: In function 'slab_obj_ext_codetag_ref':
>> mm/kasan/../slab.h:720:46: error: 'slabobj_ext_idx_ctref' undeclared (first use in this function); did you mean 'slabobj_ext_idx_objcg'?
     return &slab_obj_ext(slab, obj_exts, index, slabobj_ext_idx_ctref)->_ctref;
                                                 ^~~~~~~~~~~~~~~~~~~~~
                                                 slabobj_ext_idx_objcg
   mm/kasan/../slab.h:720:46: note: each undeclared identifier is reported only once for each function it appears in
   mm/kasan/../slab.h: In function 'obj_ext_codetag_ref_start':
   mm/kasan/../slab.h:731:19: error: 'slabobj_ext_idx_ctref' undeclared (first use in this function); did you mean 'slabobj_ext_idx_objcg'?
     return obj_ext + slabobj_ext_idx_ctref * slab->objects;
                      ^~~~~~~~~~~~~~~~~~~~~
                      slabobj_ext_idx_objcg
--
   In file included from mm/kfence/kfence.h:17,
                    from mm/kfence/core.c:39:
   mm/kfence/../slab.h: In function 'slab_obj_ext_codetag_ref':
>> mm/kfence/../slab.h:720:46: error: 'slabobj_ext_idx_ctref' undeclared (first use in this function); did you mean 'slabobj_ext_idx_objcg'?
     return &slab_obj_ext(slab, obj_exts, index, slabobj_ext_idx_ctref)->_ctref;
                                                 ^~~~~~~~~~~~~~~~~~~~~
                                                 slabobj_ext_idx_objcg
   mm/kfence/../slab.h:720:46: note: each undeclared identifier is reported only once for each function it appears in
   mm/kfence/../slab.h: In function 'obj_ext_codetag_ref_start':
   mm/kfence/../slab.h:731:19: error: 'slabobj_ext_idx_ctref' undeclared (first use in this function); did you mean 'slabobj_ext_idx_objcg'?
     return obj_ext + slabobj_ext_idx_ctref * slab->objects;
                      ^~~~~~~~~~~~~~~~~~~~~
                      slabobj_ext_idx_objcg


vim +720 mm/slab.h

   712	
   713	static inline union codetag_ref *slab_obj_ext_codetag_ref(struct slab *slab,
   714						unsigned long obj_exts, const void *obj)
   715	{
   716		unsigned int index;
   717	
   718		index = obj_to_index(slab->slab_cache, slab, obj);
   719	
 > 720		return &slab_obj_ext(slab, obj_exts, index, slabobj_ext_idx_ctref)->_ctref;
   721	}
   722	
   723	/*
   724	 * Given slabobj_ext, return the first entry where codetag entries start.
   725	 *
   726	 * Can only be used on slabobj_ext allocated by kmalloc, not in-obj.
   727	 */
   728	static inline struct slabobj_ext *obj_ext_codetag_ref_start(struct slab *slab,
   729							struct slabobj_ext *obj_ext)
   730	{
   731		return obj_ext + slabobj_ext_idx_ctref * slab->objects;
 > 732	}
   733	

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