tree: https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git xdp-queueing-01 head: 7cdc645073a59261514e56e1a4c6d0dac1b24b32 commit: 64155ff31b7e15635ccae5395cf57caa0834faba [2/9] xdp: add dequeue program type for getting packets from a PIFO config: s390-allyesconfig (attached as .config) compiler: s390-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/toke/linux.git/commit/?id... git remote add toke https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git git fetch --no-tags toke xdp-queueing-01 git checkout 64155ff31b7e15635ccae5395cf57caa0834faba # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=s390 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 >>): 4550 | 0, /* avoid empty array */ | ^ kernel/bpf/btf.c:4550:9: note: (near initialization for 'bpf_ctx_convert_map[32]') kernel/bpf/btf.c: In function 'btf_seq_show': kernel/bpf/btf.c:5876:29: error: function 'btf_seq_show' might be a candidate for 'gnu_printf' format attribute [-Werror=suggest-attribute=format] 5876 | seq_vprintf((struct seq_file *)show->target, fmt, args); | ^~~~~~~~ kernel/bpf/btf.c: In function 'btf_snprintf_show': kernel/bpf/btf.c:5913:9: error: function 'btf_snprintf_show' might be a candidate for 'gnu_printf' format attribute [-Werror=suggest-attribute=format] 5913 | len = vsnprintf(show->target, ssnprintf->len_left, fmt, args); | ^~~ cc1: all warnings being treated as errors vim +4550 kernel/bpf/btf.c 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4524 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4525 #define BPF_MAP_TYPE(_id, _ops) f2e10bff16a0fdd Andrii Nakryiko 2020-04-28 4526 #define BPF_LINK_TYPE(_id, _name) 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4527 static union { 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4528 struct bpf_ctx_convert { 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4529 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \ 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4530 prog_ctx_type _id##_prog; \ 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4531 kern_ctx_type _id##_kern; 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4532 #include <linux/bpf_types.h> 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4533 #undef BPF_PROG_TYPE 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4534 } *__t; 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4535 /* 't' is written once under lock. Read many times. */ 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4536 const struct btf_type *t; 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4537 } bpf_ctx_convert; 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4538 enum { 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4539 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \ 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4540 __ctx_convert##_id, 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4541 #include <linux/bpf_types.h> 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4542 #undef BPF_PROG_TYPE ce27709b8162e5c Alexei Starovoitov 2019-11-27 4543 __ctx_convert_unused, /* to avoid empty enum in extreme .config */ 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4544 }; 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4545 static u8 bpf_ctx_convert_map[] = { 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4546 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \ 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4547 [_id] = __ctx_convert##_id, 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4548 #include <linux/bpf_types.h> 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4549 #undef BPF_PROG_TYPE 4c80c7bc583a87d Arnd Bergmann 2019-12-10 @4550 0, /* avoid empty array */ 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4551 }; 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4552 #undef BPF_MAP_TYPE f2e10bff16a0fdd Andrii Nakryiko 2020-04-28 4553 #undef BPF_LINK_TYPE 91cc1a99740e2ed Alexei Starovoitov 2019-11-14 4554 :::::: The code at line 4550 was first introduced by commit :::::: 4c80c7bc583a87ded5f61906f81256b57c795806 bpf: Fix build in minimal configurations, again :::::: TO: Arnd Bergmann <arnd(a)arndb.de&gt; :::::: CC: Daniel Borkmann <daniel(a)iogearbox.net&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org