Re: [PATCH v1 bpf-next 1/2] bpf: Support BPF_F_MMAPABLE task_local storage

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

Hi Dave,

kernel test robot noticed the following build warnings:

[auto build test WARNING on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Dave-Marchevsky/bpf-Support-BPF_F_MMAPABLE-task_local-storage/20231121-020345
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20231120175925.733167-2-davemarchevsky%40fb.com
patch subject: [PATCH v1 bpf-next 1/2] bpf: Support BPF_F_MMAPABLE task_local storage
config: sparc-randconfig-r081-20231121 (https://download.01.org/0day-ci/archive/20231121/202311211037.6BmDdrr4-lkp@intel.com/config)
compiler: sparc-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231121/202311211037.6BmDdrr4-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/202311211037.6BmDdrr4-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/bpf/syscall.c:407:20: warning: no previous prototype for 'bpf_map_get_memcg' [-Wmissing-prototypes]
     407 | struct mem_cgroup *bpf_map_get_memcg(const struct bpf_map *map)
         |                    ^~~~~~~~~~~~~~~~~
--
>> kernel/bpf/bpf_local_storage.c:30:7: warning: no previous prototype for 'alloc_mmapable_selem_value' [-Wmissing-prototypes]
      30 | void *alloc_mmapable_selem_value(struct bpf_local_storage_map *smap)
         |       ^~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/bpf/bpf_local_storage.c: In function 'bpf_selem_free_rcu':
   kernel/bpf/bpf_local_storage.c:288:39: warning: variable 'smap' set but not used [-Wunused-but-set-variable]
     288 |         struct bpf_local_storage_map *smap;
         |                                       ^~~~


vim +/bpf_map_get_memcg +407 kernel/bpf/syscall.c

   406	
 > 407	struct mem_cgroup *bpf_map_get_memcg(const struct bpf_map *map)
   408	{
   409		if (map->objcg)
   410			return get_mem_cgroup_from_objcg(map->objcg);
   411	
   412		return root_mem_cgroup;
   413	}
   414	

-- 
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