Hi Jens, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-5.12/io_uring head: ddebaa7f62a202b40378a5a71d1a51737277d773 commit: 5af393d9a934d576bb13e45eac17ed5c1129a2f6 [28/34] fs: provide locked helper variant of close_fd_get_file() config: x86_64-randconfig-a002-20210120 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 22b68440e1647e16b5ee24b924986207173c02d1) 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 # https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/com... git remote add block https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git git fetch --no-tags block for-5.12/io_uring git checkout 5af393d9a934d576bb13e45eac17ed5c1129a2f6 # 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 >>): int __close_fd_get_file(unsigned int fd, struct file **res) ^ fs/file.c:738:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __close_fd_get_file(unsigned int fd, struct file **res) ^ static 1 warning generated. vim +/__close_fd_get_file +738 fs/file.c 733 734 /* 735 * See close_fd_get_file() below, this variant assumes current->files->file_lock 736 * is held. 737 */ 739 { 740 struct files_struct *files = current->files; 741 struct file *file; 742 struct fdtable *fdt; 743 744 fdt = files_fdtable(files); 745 if (fd >= fdt->max_fds) 746 goto out_err; 747 file = fdt->fd[fd]; 748 if (!file) 749 goto out_err; 750 rcu_assign_pointer(fdt->fd[fd], NULL); 751 __put_unused_fd(files, fd); 752 get_file(file); 753 *res = file; 754 return 0; 755 out_err: 756 *res = NULL; 757 return -ENOENT; 758 } 759 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org