Hi "Toke, I love your patch! Yet something to improve: [auto build test ERROR on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Toke-H-iland-J-rgensen/bpf-Suppo... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: i386-randconfig-a014-20200914 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # save the attached .config to linux build tree make W=1 ARCH=i386 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/core.o: in function `bpf_prog_free_deferred': # https://github.com/0day-ci/linux/commit/3c0e2196879a758e13a0dc59ea06c3c02... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Toke-H-iland-J-rgensen/bpf-Support-multi-attach-for-freplace-programs/20200915-003428 git checkout 3c0e2196879a758e13a0dc59ea06c3c02e5236bf vim +2133 kernel/bpf/core.c 2119 2120 static void bpf_prog_free_deferred(struct work_struct *work) 2121 { 2122 struct bpf_prog_aux *aux; 2123 int i; 2124 2125 aux = container_of(work, struct bpf_prog_aux, work); 2126 bpf_free_used_maps(aux); 2127 if (bpf_prog_is_dev_bound(aux)) 2128 bpf_prog_offload_destroy(aux->prog); 2129 #ifdef CONFIG_PERF_EVENTS 2130 if (aux->prog->has_callchain_buf) 2131 put_callchain_buffers(); 2132 #endif 2134 for (i = 0; i < aux->func_cnt; i++) 2135 bpf_jit_free(aux->func[i]); 2136 if (aux->func_cnt) { 2137 kfree(aux->func); 2138 bpf_prog_unlock_free(aux->prog); 2139 } else { 2140 bpf_jit_free(aux->prog); 2141 } 2142 } 2143 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org