mm/slub.c:1946:34: error: unused function 'memcg_from_slab_obj'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   052d534373b7ed33712a63d5e17b2b6cdbce84fd
commit: 0bedcc66d2a43a50ab660273842f4737a293dd8a mm/slab: move memcg related functions from slab.h to slub.c
date:   5 weeks ago
config: x86_64-sof-customedconfig-edison-defconfig (https://download.01.org/0day-ci/archive/20240113/202401132054.I2L6evrk-lkp@xxxxxxxxx/config)
compiler: ClangBuiltLinux clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240113/202401132054.I2L6evrk-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401132054.I2L6evrk-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

>> mm/slub.c:1946:34: error: unused function 'memcg_from_slab_obj' [-Werror,-Wunused-function]
    1946 | static inline struct mem_cgroup *memcg_from_slab_obj(void *ptr)
         |                                  ^~~~~~~~~~~~~~~~~~~
   1 error generated.


vim +/memcg_from_slab_obj +1946 mm/slub.c

  1915	
  1916	static inline void memcg_slab_free_hook(struct kmem_cache *s, struct slab *slab,
  1917						void **p, int objects)
  1918	{
  1919		struct obj_cgroup **objcgs;
  1920		int i;
  1921	
  1922		if (!memcg_kmem_online())
  1923			return;
  1924	
  1925		objcgs = slab_objcgs(slab);
  1926		if (!objcgs)
  1927			return;
  1928	
  1929		for (i = 0; i < objects; i++) {
  1930			struct obj_cgroup *objcg;
  1931			unsigned int off;
  1932	
  1933			off = obj_to_index(s, slab, p[i]);
  1934			objcg = objcgs[off];
  1935			if (!objcg)
  1936				continue;
  1937	
  1938			objcgs[off] = NULL;
  1939			obj_cgroup_uncharge(objcg, obj_full_size(s));
  1940			mod_objcg_state(objcg, slab_pgdat(slab), cache_vmstat_idx(s),
  1941					-obj_full_size(s));
  1942			obj_cgroup_put(objcg);
  1943		}
  1944	}
  1945	#else /* CONFIG_MEMCG_KMEM */
> 1946	static inline struct mem_cgroup *memcg_from_slab_obj(void *ptr)
  1947	{
  1948		return NULL;
  1949	}
  1950	

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