Hi Alan, Thank you for the patch! Yet something to improve: [auto build test ERROR on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Alan-Maguire/libbpf-BTF-dumper-s... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: x86_64-rhel-8.3-kselftests (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/a0ac40961a89472fd36dcc5449e7a8e0e... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Alan-Maguire/libbpf-BTF-dumper-support-for-typed-data/20210619-165722 git checkout a0ac40961a89472fd36dcc5449e7a8e0e263d4c0 # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): btf_dump.c: In function 'btf_dump_type_data_check_zero': 2107 | __u8 bit_sz; | ^~~~~~ btf_dump.c:2024:12: note: shadowed declaration is here 2024 | __u8 bit_sz) | ~~~~~^~~~~~ cc1: all warnings being treated as errors make[5]: *** [tools/build/Makefile.build:96: tools/bpf/resolve_btfids/libbpf/staticobjs/btf_dump.o] Error 1 make[4]: *** [Makefile:158: tools/bpf/resolve_btfids/libbpf/staticobjs/libbpf-in.o] Error 2 make[3]: *** [Makefile:44: tools/bpf/resolve_btfids//libbpf/libbpf.a] Error 2 -- btf_dump.c: In function 'btf_dump_type_data_check_zero': 2107 | __u8 bit_sz; | ^~~~~~ btf_dump.c:2024:12: note: shadowed declaration is here 2024 | __u8 bit_sz) | ~~~~~^~~~~~ cc1: all warnings being treated as errors make[5]: *** [tools/build/Makefile.build:96: tools/bpf/resolve_btfids/libbpf/staticobjs/btf_dump.o] Error 1 make[4]: *** [Makefile:158: tools/bpf/resolve_btfids/libbpf/staticobjs/libbpf-in.o] Error 2 make[3]: *** [Makefile:44: tools/bpf/resolve_btfids//libbpf/libbpf.a] Error 2 make[2]: *** [Makefile:72: bpf/resolve_btfids] Error 2 make[1]: *** [Makefile:1965: tools/bpf/resolve_btfids] Error 2 make[1]: Target 'modules_prepare' not remade because of errors. make: *** [Makefile:215: __sub-make] Error 2 make: Target 'modules_prepare' not remade because of errors. -- btf_dump.c: In function 'btf_dump_type_data_check_zero': 2107 | __u8 bit_sz; | ^~~~~~ btf_dump.c:2024:12: note: shadowed declaration is here 2024 | __u8 bit_sz) | ~~~~~^~~~~~ cc1: all warnings being treated as errors make[5]: *** [tools/build/Makefile.build:96: tools/bpf/resolve_btfids/libbpf/staticobjs/btf_dump.o] Error 1 make[5]: *** Waiting for unfinished jobs.... make[4]: *** [Makefile:158: tools/bpf/resolve_btfids/libbpf/staticobjs/libbpf-in.o] Error 2 make[3]: *** [Makefile:44: tools/bpf/resolve_btfids//libbpf/libbpf.a] Error 2 make[2]: *** [Makefile:72: bpf/resolve_btfids] Error 2 make[1]: *** [Makefile:1965: tools/bpf/resolve_btfids] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:215: __sub-make] Error 2 make: Target 'prepare' not remade because of errors. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org