Hi Jesper, I love your patch! Perhaps something to improve: [auto build test WARNING on bpf/master] url: https://github.com/0day-ci/linux/commits/Jesper-Dangaard-Brouer/bpf-avoid... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master config: x86_64-randconfig-r003-20200608 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project e429cffd4f228f70c1d9df0e5d77c08590dd9766) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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 warnings (new ones prefixed by >>, old ones prefixed by <<): int bpf_anon_inode_getfd(const char *name, const struct file_operations *fops, ^ kernel/bpf/syscall.c:692:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int bpf_anon_inode_getfd(const char *name, const struct file_operations *fops, ^ static 1 warning generated. vim +/bpf_anon_inode_getfd +692 kernel/bpf/syscall.c 690 691 /* Code is similar to anon_inode_getfd(), except starts at FD 1 */ 693 void *priv, int flags) 694 { 695 int error, fd; 696 struct file *file; 697 698 error = alloc_fd(1, flags); 699 if (error < 0) 700 return error; 701 fd = error; 702 703 file = anon_inode_getfile(name, fops, priv, flags); 704 if (IS_ERR(file)) { 705 error = PTR_ERR(file); 706 goto err_put_unused_fd; 707 } 708 fd_install(fd, file); 709 710 return fd; 711 712 err_put_unused_fd: 713 put_unused_fd(fd); 714 return error; 715 } 716 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org