kernel/bpf/helpers.c:685:39: warning: bitwise operation between different enumeration types ('enum bpf_return_type' and 'enum bpf_type_flag')

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

CC: linux-kernel@vger.kernel.org
TO: Hao Luo <haoluo@google.com>
CC: Alexei Starovoitov <ast@kernel.org>

Hi Hao,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   6537cfb395f352782918d8ee7b7f10ba2cc3cbf2
commit: 3c4807322660d4290ac9062c034aed6b87243861 bpf: Replace RET_XXX_OR_NULL with RET_XXX | PTR_MAYBE_NULL
date:   3 years, 2 months ago
config: arm-randconfig-004-20250120 (https://download.01.org/0day-ci/archive/20250219/202502191132.ElRmNRIr-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250219/202502191132.ElRmNRIr-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/202502191132.ElRmNRIr-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from kernel/bpf/helpers.c:4:
   In file included from include/linux/bpf.h:20:
   In file included from include/linux/kallsyms.h:13:
   In file included from include/linux/mm.h:1721:
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> kernel/bpf/helpers.c:685:39: warning: bitwise operation between different enumeration types ('enum bpf_return_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
     685 |         .ret_type       = RET_PTR_TO_MEM_OR_BTF_ID | PTR_MAYBE_NULL,
         |                           ~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~
   2 warnings generated.


vim +685 kernel/bpf/helpers.c

   681	
   682	const struct bpf_func_proto bpf_per_cpu_ptr_proto = {
   683		.func		= bpf_per_cpu_ptr,
   684		.gpl_only	= false,
 > 685		.ret_type	= RET_PTR_TO_MEM_OR_BTF_ID | PTR_MAYBE_NULL,
   686		.arg1_type	= ARG_PTR_TO_PERCPU_BTF_ID,
   687		.arg2_type	= ARG_ANYTHING,
   688	};
   689	

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