Hi Matteo,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on bpf/master]

url:    https://github.com/0day-ci/linux/commits/Matteo-Croce/bpf-kernel-CO-RE-relocation/20210909-213900
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master
config: sh-allmodconfig (attached as .config)
compiler: sh4-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://github.com/0day-ci/linux/commit/c195b385facdf03a4ce9fc7a00d370b1753de6b6
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Matteo-Croce/bpf-kernel-CO-RE-relocation/20210909-213900
        git checkout c195b385facdf03a4ce9fc7a00d370b1753de6b6
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=sh 

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

All warnings (new ones prefixed by >>):

>> kernel/bpf/relo_core.c:168:1: warning: no previous prototype for 'skip_mods_and_typedefs' [-Wmissing-prototypes]
     168 | skip_mods_and_typedefs(const struct btf *btf, __u32 id, __u32 *res_id)
         | ^~~~~~~~~~~~~~~~~~~~~~
   kernel/bpf/relo_core.c: In function 'bpf_core_apply_relo_insn':
>> kernel/bpf/relo_core.c:1457:1: warning: the frame size of 2188 bytes is larger than 1024 bytes [-Wframe-larger-than=]
    1457 | }
         | ^

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for SND_ATMEL_SOC_PDC
   Depends on SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC && HAS_DMA
   Selected by
   - SND_ATMEL_SOC_SSC && SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC
   - SND_ATMEL_SOC_SSC_PDC && SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC && ATMEL_SSC


vim +/skip_mods_and_typedefs +168 kernel/bpf/relo_core.c

   166	
   167	const struct btf_type *
 > 168	skip_mods_and_typedefs(const struct btf *btf, __u32 id, __u32 *res_id)
   169	{
   170		const struct btf_type *t = btf__type_by_id(btf, id);
   171	
   172		if (res_id)
   173			*res_id = id;
   174	
   175		while (btf_type_is_modifier(t) || btf_type_is_typedef(t)) {
   176			if (res_id)
   177				*res_id = t->type;
   178			t = btf__type_by_id(btf, t->type);
   179		}
   180	
   181		return t;
   182	}
   183	

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