net/netfilter/nf_bpf_link.c:186:33: warning: bitwise operation between different enumeration types ('enum bpf_reg_type' and 'enum bpf_type_flag')

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

CC: linux-kernel@vger.kernel.org
TO: Florian Westphal <fw@strlen.de>
CC: Alexei Starovoitov <ast@kernel.org>

Hi Florian,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   ece144f151ac7bf8bb5b98f7d4aeeda7a2eed02a
commit: fd9c663b9ad67dedfc9a3fd3429ddd3e83782b4d bpf: minimal support for programs hooked into netfilter framework
date:   1 year, 10 months ago
config: x86_64-buildonly-randconfig-004-20241224 (https://download.01.org/0day-ci/archive/20250302/202503021244.CdSIteqW-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/20250302/202503021244.CdSIteqW-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/202503021244.CdSIteqW-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from net/netfilter/nf_bpf_link.c:2:
   In file included from include/linux/bpf.h:21:
   In file included from include/linux/kallsyms.h:13:
   In file included from include/linux/mm.h:1970:
   include/linux/vmstat.h:502:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     502 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     503 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:509:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     509 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     510 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:516:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     516 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   include/linux/vmstat.h:521:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     521 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     522 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
>> net/netfilter/nf_bpf_link.c:186:33: warning: bitwise operation between different enumeration types ('enum bpf_reg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
     186 |         info->reg_type = PTR_TO_BTF_ID | PTR_TRUSTED;
         |                          ~~~~~~~~~~~~~ ^ ~~~~~~~~~~~
   5 warnings generated.


vim +186 net/netfilter/nf_bpf_link.c

   170	
   171	static bool nf_ptr_to_btf_id(struct bpf_insn_access_aux *info, const char *name)
   172	{
   173		struct btf *btf;
   174		s32 type_id;
   175	
   176		btf = bpf_get_btf_vmlinux();
   177		if (IS_ERR_OR_NULL(btf))
   178			return false;
   179	
   180		type_id = btf_find_by_name_kind(btf, name, BTF_KIND_STRUCT);
   181		if (WARN_ON_ONCE(type_id < 0))
   182			return false;
   183	
   184		info->btf = btf;
   185		info->btf_id = type_id;
 > 186		info->reg_type = PTR_TO_BTF_ID | PTR_TRUSTED;
   187		return true;
   188	}
   189	

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