Re: [PATCH bpf-next v4 1/4] bpf: add bpf_get_cpu_cycles kfunc

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

Hi Vadim,

kernel test robot noticed the following build errors:

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

url:    https://github.com/intel-lab-lkp/linux/commits/Vadim-Fedorenko/bpf-add-bpf_cpu_cycles_to_ns-helper/20241108-051950
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20241107211206.2814069-1-vadfed%40meta.com
patch subject: [PATCH bpf-next v4 1/4] bpf: add bpf_get_cpu_cycles kfunc
config: arm-randconfig-004-20241108 (https://download.01.org/0day-ci/archive/20241108/202411080939.hiAmVBIM-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 592c0fe55f6d9a811028b5f3507be91458ab2713)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241108/202411080939.hiAmVBIM-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/202411080939.hiAmVBIM-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from kernel/bpf/helpers.c:4:
   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:2213:
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   kernel/bpf/helpers.c:117:36: warning: bitwise operation between different enumeration types ('enum bpf_arg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
     117 |         .arg2_type      = ARG_PTR_TO_MAP_VALUE | MEM_UNINIT | MEM_WRITE,
         |                           ~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~
   kernel/bpf/helpers.c:130:36: warning: bitwise operation between different enumeration types ('enum bpf_arg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
     130 |         .arg2_type      = ARG_PTR_TO_MAP_VALUE | MEM_UNINIT | MEM_WRITE,
         |                           ~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~
   kernel/bpf/helpers.c:541:30: warning: bitwise operation between different enumeration types ('enum bpf_arg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
     541 |         .arg1_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
         |                           ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~
   kernel/bpf/helpers.c:544:41: warning: bitwise operation between different enumeration types ('enum bpf_arg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
     544 |         .arg4_type      = ARG_PTR_TO_FIXED_SIZE_MEM | MEM_UNINIT | MEM_WRITE | MEM_ALIGNED,
         |                           ~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~
   kernel/bpf/helpers.c:569:30: warning: bitwise operation between different enumeration types ('enum bpf_arg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
     569 |         .arg1_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
         |                           ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~
   kernel/bpf/helpers.c:572:41: warning: bitwise operation between different enumeration types ('enum bpf_arg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
     572 |         .arg4_type      = ARG_PTR_TO_FIXED_SIZE_MEM | MEM_UNINIT | MEM_WRITE | MEM_ALIGNED,
         |                           ~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~
   kernel/bpf/helpers.c:585:30: warning: bitwise operation between different enumeration types ('enum bpf_arg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
     585 |         .arg1_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
         |                           ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~
   kernel/bpf/helpers.c:655:35: warning: bitwise operation between different enumeration types ('enum bpf_arg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
     655 |         .arg4_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
         |                           ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~
   kernel/bpf/helpers.c:727:39: warning: bitwise operation between different enumeration types ('enum bpf_return_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
     727 |         .ret_type       = RET_PTR_TO_MEM_OR_BTF_ID | PTR_MAYBE_NULL | MEM_RDONLY,
         |                           ~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~
   kernel/bpf/helpers.c:740:39: warning: bitwise operation between different enumeration types ('enum bpf_return_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
     740 |         .ret_type       = RET_PTR_TO_MEM_OR_BTF_ID | MEM_RDONLY,
         |                           ~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~
   kernel/bpf/helpers.c:1082:30: warning: bitwise operation between different enumeration types ('enum bpf_arg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
    1082 |         .arg4_type      = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY,
         |                           ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~
   kernel/bpf/helpers.c:1643:44: warning: bitwise operation between different enumeration types ('enum bpf_arg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
    1643 |         .arg2_type    = ARG_PTR_TO_BTF_ID_OR_NULL | OBJ_RELEASE,
         |                         ~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~
   kernel/bpf/helpers.c:1748:33: warning: bitwise operation between different enumeration types ('enum bpf_arg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
    1748 |         .arg4_type      = ARG_PTR_TO_DYNPTR | DYNPTR_TYPE_LOCAL | MEM_UNINIT | MEM_WRITE,
         |                           ~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~
   kernel/bpf/helpers.c:1791:33: warning: bitwise operation between different enumeration types ('enum bpf_arg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
    1791 |         .arg3_type      = ARG_PTR_TO_DYNPTR | MEM_RDONLY,
         |                           ~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~
   kernel/bpf/helpers.c:1839:33: warning: bitwise operation between different enumeration types ('enum bpf_arg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
    1839 |         .arg1_type      = ARG_PTR_TO_DYNPTR | MEM_RDONLY,
         |                           ~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~
   kernel/bpf/helpers.c:1841:30: warning: bitwise operation between different enumeration types ('enum bpf_arg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
    1841 |         .arg3_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
         |                           ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~
   kernel/bpf/helpers.c:1881:33: warning: bitwise operation between different enumeration types ('enum bpf_arg_type' and 'enum bpf_type_flag') [-Wenum-enum-conversion]
    1881 |         .arg1_type      = ARG_PTR_TO_DYNPTR | MEM_RDONLY,
         |                           ~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~
   kernel/bpf/helpers.c:3029:18: warning: extra tokens at end of #ifdef directive [-Wextra-tokens]
    3029 | #ifdef IS_ENABLED(CONFIG_GENERIC_GETTIMEOFDAY)
         |                  ^
         |                  //
>> kernel/bpf/helpers.c:3032:9: error: call to undeclared function '__arch_get_hw_counter'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    3032 |         return __arch_get_hw_counter(1, NULL);
         |                ^
   kernel/bpf/helpers.c:3128:18: warning: extra tokens at end of #ifdef directive [-Wextra-tokens]
    3128 | #ifdef IS_ENABLED(CONFIG_GENERIC_GETTIMEOFDAY)
         |                  ^
         |                  //
   20 warnings and 1 error generated.


vim +/__arch_get_hw_counter +3032 kernel/bpf/helpers.c

  3028	
  3029	#ifdef IS_ENABLED(CONFIG_GENERIC_GETTIMEOFDAY)
  3030	__bpf_kfunc u64 bpf_get_cpu_cycles(void)
  3031	{
> 3032		return __arch_get_hw_counter(1, NULL);
  3033	}
  3034	#endif
  3035	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki