[ast-bpf:relo_core 9/19] kernel/bpf/btf.c:6417:5: error: no previous prototype for 'bpf_core_types_are_compat'

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf.git relo_core
head:   f17ef55e5e0bac0d11d3186cd1c468b5a1e047d7
commit: 03c354f8c71c2478c421d5552d284e0befb03861 [9/19] bpf: Prepare relo_core.c for kernel duty.
config: m68k-allyesconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf.git/commit/?id=03c354f8c71c2478c421d5552d284e0befb03861
        git remote add ast-bpf https://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf.git
        git fetch --no-tags ast-bpf relo_core
        git checkout 03c354f8c71c2478c421d5552d284e0befb03861
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=m68k 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

Note: the ast-bpf/relo_core HEAD f17ef55e5e0bac0d11d3186cd1c468b5a1e047d7 builds fine.
      It only hurts bisectability.

All errors (new ones prefixed by >>):

   kernel/bpf/btf.c: In function 'btf_seq_show':
   kernel/bpf/btf.c:5888:29: error: function 'btf_seq_show' might be a candidate for 'gnu_printf' format attribute [-Werror=suggest-attribute=format]
    5888 |         seq_vprintf((struct seq_file *)show->target, fmt, args);
         |                             ^~~~~~~~
   kernel/bpf/btf.c: In function 'btf_snprintf_show':
   kernel/bpf/btf.c:5925:9: error: function 'btf_snprintf_show' might be a candidate for 'gnu_printf' format attribute [-Werror=suggest-attribute=format]
    5925 |         len = vsnprintf(show->target, ssnprintf->len_left, fmt, args);
         |         ^~~
   kernel/bpf/btf.c: At top level:
>> kernel/bpf/btf.c:6417:5: error: no previous prototype for 'bpf_core_types_are_compat' [-Werror=missing-prototypes]
    6417 | int bpf_core_types_are_compat(const struct btf *local_btf, __u32 local_id,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~
>> kernel/bpf/btf.c:6431:8: error: no previous prototype for 'bpf_core_essential_name_len' [-Werror=missing-prototypes]
    6431 | size_t bpf_core_essential_name_len(const char *name)
         |        ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +/bpf_core_types_are_compat +6417 kernel/bpf/btf.c

  6416	
> 6417	int bpf_core_types_are_compat(const struct btf *local_btf, __u32 local_id,
  6418				      const struct btf *targ_btf, __u32 targ_id)
  6419	{
  6420		return -EOPNOTSUPP;
  6421	}
  6422	
  6423	static bool bpf_core_is_flavor_sep(const char *s)
  6424	{
  6425		/* check X___Y name pattern, where X and Y are not underscores */
  6426		return s[0] != '_' &&				      /* X */
  6427		       s[1] == '_' && s[2] == '_' && s[3] == '_' &&   /* ___ */
  6428		       s[4] != '_';				      /* Y */
  6429	}
  6430	
> 6431	size_t bpf_core_essential_name_len(const char *name)

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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