tree: https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/batch head: 5f1f613266bf58f8424a93e1f8b99c4ac8fa6c2b commit: 12ea728e52b0432131a800281f2015a7358b3d81 [17/29] bpf: Resolve id in bpf_tramp_id_single config: i386-randconfig-c023-20211118 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/commit/?id... git remote add jolsa-perf https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git git fetch --no-tags jolsa-perf bpf/batch git checkout 12ea728e52b0432131a800281f2015a7358b3d81 # save the attached .config to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash 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 >>): ld: kernel/bpf/trampoline.o: in function `bpf_tramp_id_single': ld: kernel/bpf/trampoline.o: in function `bpf_tramp_attach': kernel/bpf/trampoline.c:644: undefined reference to `bpf_check_attach_model' vim +118 kernel/bpf/trampoline.c 106 107 struct bpf_tramp_id *bpf_tramp_id_single(const struct bpf_prog *tgt_prog, 108 struct bpf_prog *prog, u32 btf_id, 109 struct bpf_attach_target_info *tgt_info) 110 { 111 struct bpf_tramp_id *id; 112 113 if (!tgt_info) { 114 struct bpf_attach_target_info __tgt_info = {}; 115 int err; 116 117 tgt_info = &__tgt_info; 119 tgt_info); 120 if (err) 121 return ERR_PTR(err); 122 } 123 id = bpf_tramp_id_alloc(1); 124 if (!id) 125 return ERR_PTR(-ENOMEM); 126 if (tgt_prog) 127 id->obj_id = tgt_prog->aux->id; 128 else 130 id->id[0] = btf_id; 131 id->addr[0] = (void *) tgt_info->tgt_addr; 132 id->cnt = 1; 133 return id; 134 } 135 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org