Hi Lorenzo, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Lorenzo-Fontana/tools-lib-bpf-bp... 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/999d9928ec3dd02a08da121d137739268... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Lorenzo-Fontana/tools-lib-bpf-bpf_program__insns-allow-to-retrieve-insns-in-libbpf/20210714-023628 git checkout 999d9928ec3dd02a08da121d1377392681c84e51 # 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 warnings (new ones prefixed by >>): Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h' Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h' Warning: Kernel ABI header at 'tools/include/uapi/linux/if_link.h' differs from latest version at 'include/uapi/linux/if_link.h' In file included from netlink.c:9: usr/include/linux/if_ether.h:169:1: warning: packed attribute is unnecessary for 'ethhdr' [-Wpacked] 169 | } __attribute__((packed)); | ^ In file included from tools/include/uapi/linux/ethtool.h:19, from xsk.c:18: usr/include/linux/if_ether.h:169:1: warning: packed attribute is unnecessary for 'ethhdr' [-Wpacked] 169 | } __attribute__((packed)); | ^ In file included from tools/include/uapi/linux/ethtool.h:19, from xsk.c:18: usr/include/linux/if_ether.h:169:1: warning: packed attribute is unnecessary for 'ethhdr' [-Wpacked] 169 | } __attribute__((packed)); | ^ In file included from netlink.c:9: usr/include/linux/if_ether.h:169:1: warning: packed attribute is unnecessary for 'ethhdr' [-Wpacked] 169 | } __attribute__((packed)); | ^ make[2]: *** [Makefile:186: check_abi] Error 1 make[2]: Target 'all_cmd' not remade because of errors. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org