Hi Andrii, I love your patch! Yet something to improve: [auto build test ERROR on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Andrii-Nakryiko/Support-BTF-powered-BPF-tracing-programs-for-kernel-modules/20201203-115515 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: i386-randconfig-s002-20201203 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-179-ga00755aa-dirty # https://github.com/0day-ci/linux/commit/c0eabf99f8312c12d4c210628360d28bbf915a91 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Andrii-Nakryiko/Support-BTF-powered-BPF-tracing-programs-for-kernel-modules/20201203-115515 git checkout c0eabf99f8312c12d4c210628360d28bbf915a91 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): ld: kernel/bpf/core.o: in function `bpf_prog_free': >> kernel/bpf/core.c:2155: undefined reference to `btf_put' vim +2155 kernel/bpf/core.c 2146 2147 /* Free internal BPF program */ 2148 void bpf_prog_free(struct bpf_prog *fp) 2149 { 2150 struct bpf_prog_aux *aux = fp->aux; 2151 2152 if (aux->dst_prog) 2153 bpf_prog_put(aux->dst_prog); 2154 if (aux->attach_btf) > 2155 btf_put(aux->attach_btf); 2156 INIT_WORK(&aux->work, bpf_prog_free_deferred); 2157 schedule_work(&aux->work); 2158 } 2159 EXPORT_SYMBOL_GPL(bpf_prog_free); 2160 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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