[axboe-block:for-5.20/io_uring 61/69] io_uring/io_uring.c:3795:6: warning: no previous prototype for 'io_assign_file'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-5.20/io_uring
head:   35527d1da9a7caedd07ab1b0a2176ea80bbdf692
commit: 7d8795a4e662b005b70330c8038f486f4465e4de [61/69] io_uring: move poll handling into its own file
config: um-x86_64_defconfig (https://download.01.org/0day-ci/archive/20220602/202206021948.3N7DAXYa-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?id=7d8795a4e662b005b70330c8038f486f4465e4de
        git remote add axboe-block https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
        git fetch --no-tags axboe-block for-5.20/io_uring
        git checkout 7d8795a4e662b005b70330c8038f486f4465e4de
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um SUBARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

   io_uring/io_uring.c: In function '__io_submit_flush_completions':
   io_uring/io_uring.c:1743:40: warning: variable 'prev' set but not used [-Wunused-but-set-variable]
    1743 |         struct io_wq_work_node *node, *prev;
         |                                        ^~~~
   io_uring/io_uring.c: At top level:
>> io_uring/io_uring.c:3795:6: warning: no previous prototype for 'io_assign_file' [-Wmissing-prototypes]
    3795 | bool io_assign_file(struct io_kiocb *req, unsigned int issue_flags)
         |      ^~~~~~~~~~~~~~


vim +/io_assign_file +3795 io_uring/io_uring.c

  3794	
> 3795	bool io_assign_file(struct io_kiocb *req, unsigned int issue_flags)
  3796	{
  3797		if (req->file || !io_op_defs[req->opcode].needs_file)
  3798			return true;
  3799	
  3800		if (req->flags & REQ_F_FIXED_FILE)
  3801			req->file = io_file_get_fixed(req, req->cqe.fd, issue_flags);
  3802		else
  3803			req->file = io_file_get_normal(req, req->cqe.fd);
  3804	
  3805		return !!req->file;
  3806	}
  3807	

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