Hi Yonghong, Thank you for the patch! Yet something to improve:
[auto build test ERROR on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Yonghong-Song/bpf-add-bpf_get_stack-helper/20180418-210810 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: ia64-allmodconfig (attached as .config) compiler: ia64-linux-gcc (GCC) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=ia64 All errors (new ones prefixed by >>): kernel/bpf/core.c: In function 'bpf_prog_free_deferred': >> kernel/bpf/core.c:1714:3: error: implicit declaration of function >> 'put_callchain_buffers' [-Werror=implicit-function-declaration] put_callchain_buffers(); ^~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/put_callchain_buffers +1714 kernel/bpf/core.c 1704 1705 static void bpf_prog_free_deferred(struct work_struct *work) 1706 { 1707 struct bpf_prog_aux *aux; 1708 int i; 1709 1710 aux = container_of(work, struct bpf_prog_aux, work); 1711 if (bpf_prog_is_dev_bound(aux)) 1712 bpf_prog_offload_destroy(aux->prog); 1713 if (aux->prog->need_callchain_buf) > 1714 put_callchain_buffers(); 1715 for (i = 0; i < aux->func_cnt; i++) 1716 bpf_jit_free(aux->func[i]); 1717 if (aux->func_cnt) { 1718 kfree(aux->func); 1719 bpf_prog_unlock_free(aux->prog); 1720 } else { 1721 bpf_jit_free(aux->prog); 1722 } 1723 } 1724 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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