[vbabka:objext_split 10/14] kernel/bpf/../../mm/slab.h:702:47: error: no member named '_ctref' in 'struct slabobj_ext'

[vbabka:objext_split 10/14] kernel/bpf/../../mm/slab.h:702:47: error: no member named '_ctref' in 'struct slabobj_ext'

[kernel test robot]

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: 510dc45196b1495bba6f15a6f3348ace5c983136 [10/14] mm/slab: abstract slabobj_ext.ref access
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260709/202607090246.FbXygihm-lkp@intel.com/config)
compiler: clang version 22.1.8 (https://github.com/llvm/llvm-project ca7933e47d3a3451d81e72ac174dcb5aa28b59d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260709/202607090246.FbXygihm-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/202607090246.FbXygihm-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from kernel/bpf/kmem_cache_iter.c:9:
>> kernel/bpf/../../mm/slab.h:702:47: error: no member named '_ctref' in 'struct slabobj_ext'
     702 |         return &slab_obj_ext(slab, obj_exts, index)->_ctref;
         |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  ^
   1 error generated.


vim +702 kernel/bpf/../../mm/slab.h

   694	
   695	static inline union codetag_ref *slab_obj_ext_codetag_ref(struct slab *slab,
   696						unsigned long obj_exts, const void *obj)
   697	{
   698		unsigned int index;
   699	
   700		index = obj_to_index(slab->slab_cache, slab, obj);
   701	
 > 702		return &slab_obj_ext(slab, obj_exts, index)->_ctref;
   703	}
   704	

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