Hi YangYuxi, Thank you for the patch! Yet something to improve: [auto build test ERROR on bpf-next/master] [also build test ERROR on bpf/master net/master ipvs/master net-next/master v5.8-rc5 next-20200716] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/YangYuxi/ebpf-fix-parameter-nami... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: x86_64-rhel-7.6-kselftests (attached as .config) compiler: gcc-9 (Debian 9.3.0-14) 9.3.0 reproduce (this is a W=1 build): # save the attached .config to linux build tree make W=1 ARCH=x86_64 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 >>): kernel/bpf/syscall.c: In function 'bpf_prog_get_ok': 1887 | if (!attach_type) | ^~~~~~~~~~~ | stack_type kernel/bpf/syscall.c:1887:7: note: each undeclared identifier is reported only once for each function it appears in vim +1887 kernel/bpf/syscall.c b16d9aa4c2b90a Martin KaFai Lau 2017-06-05 1882 040ee69226f8a9 Al Viro 2017-12-02 1883 bool bpf_prog_get_ok(struct bpf_prog *prog, 10eb063762081a YangYuxi 2020-07-16 1884 enum bpf_prog_type *prog_type, bool attach_drv) 248f346ffe9508 Jakub Kicinski 2017-11-03 1885 { 288b3de55aace8 Jakub Kicinski 2017-11-20 1886 /* not an attachment, just a refcount inc, always allow */ 288b3de55aace8 Jakub Kicinski 2017-11-20 @1887 if (!attach_type) 288b3de55aace8 Jakub Kicinski 2017-11-20 1888 return true; 248f346ffe9508 Jakub Kicinski 2017-11-03 1889 10eb063762081a YangYuxi 2020-07-16 1890 if (prog->type != *prog_type) 248f346ffe9508 Jakub Kicinski 2017-11-03 1891 return false; 288b3de55aace8 Jakub Kicinski 2017-11-20 1892 if (bpf_prog_is_dev_bound(prog->aux) && !attach_drv) 248f346ffe9508 Jakub Kicinski 2017-11-03 1893 return false; 248f346ffe9508 Jakub Kicinski 2017-11-03 1894 248f346ffe9508 Jakub Kicinski 2017-11-03 1895 return true; 248f346ffe9508 Jakub Kicinski 2017-11-03 1896 } 248f346ffe9508 Jakub Kicinski 2017-11-03 1897 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org