tree: https://github.com/zen-kernel/zen-kernel 5.10/bbr2 head: b9dd14514a5879eee40822e28074dcc6a12e12b8 commit: ba575c2fd7855b0586a87bbc6a67e1fa7fd397a1 [14/27] net-tcp: re-generalize TSO sizing in TCP CC module API config: x86_64-randconfig-s022-20210115 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-208-g46a52ca4-dirty # https://github.com/zen-kernel/zen-kernel/commit/ba575c2fd7855b0586a87bbc6... git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel git fetch --no-tags zen-kernel-zen-kernel 5.10/bbr2 git checkout ba575c2fd7855b0586a87bbc6a67e1fa7fd397a1 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the zen-kernel-zen-kernel/5.10/bbr2 HEAD b9dd14514a5879eee40822e28074dcc6a12e12b8 builds fine. It only hurts bisectibility. All errors (new ones prefixed by >>): In file included from <command-line>: 19 | offsetof(struct tcp_congestion_ops, min_tso_segs), | ^~~~~~~~~~~~ include/linux/compiler_types.h:135:57: note: in definition of macro '__compiler_offsetof' 135 | #define __compiler_offsetof(a, b) __builtin_offsetof(a, b) | ^ net/ipv4/bpf_tcp_ca.c:19:2: note: in expansion of macro 'offsetof' 19 | offsetof(struct tcp_congestion_ops, min_tso_segs), | ^~~~~~~~ vim +19 net/ipv4/bpf_tcp_ca.c 0baf26b0fcd74bbf Martin KaFai Lau 2020-01-08 11 0baf26b0fcd74bbf Martin KaFai Lau 2020-01-08 12 static u32 optional_ops[] = { 0baf26b0fcd74bbf Martin KaFai Lau 2020-01-08 13 offsetof(struct tcp_congestion_ops, init), 0baf26b0fcd74bbf Martin KaFai Lau 2020-01-08 14 offsetof(struct tcp_congestion_ops, release), 0baf26b0fcd74bbf Martin KaFai Lau 2020-01-08 15 offsetof(struct tcp_congestion_ops, set_state), 0baf26b0fcd74bbf Martin KaFai Lau 2020-01-08 16 offsetof(struct tcp_congestion_ops, cwnd_event), 0baf26b0fcd74bbf Martin KaFai Lau 2020-01-08 17 offsetof(struct tcp_congestion_ops, in_ack_event), 0baf26b0fcd74bbf Martin KaFai Lau 2020-01-08 18 offsetof(struct tcp_congestion_ops, pkts_acked), 0baf26b0fcd74bbf Martin KaFai Lau 2020-01-08 @19 offsetof(struct tcp_congestion_ops, min_tso_segs), 0baf26b0fcd74bbf Martin KaFai Lau 2020-01-08 20 offsetof(struct tcp_congestion_ops, sndbuf_expand), 0baf26b0fcd74bbf Martin KaFai Lau 2020-01-08 21 offsetof(struct tcp_congestion_ops, cong_control), 0baf26b0fcd74bbf Martin KaFai Lau 2020-01-08 22 }; 0baf26b0fcd74bbf Martin KaFai Lau 2020-01-08 23 :::::: The code at line 19 was first introduced by commit :::::: 0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 bpf: tcp: Support tcp_congestion_ops in bpf :::::: TO: Martin KaFai Lau <kafai(a)fb.com&gt; :::::: CC: Alexei Starovoitov <ast(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org