[ammarfaizi2-block:axboe/linux-block/for-5.20/io_uring 36/40] io_uring/splice.c:42:5: warning: no previous prototype for 'io_tee_prep'

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/ammarfaizi2/linux-block axboe/linux-block/for-5.20/io_uring
head:   9da4fba4e0165c5e40d689eb5d34b73d780bf067
commit: 22eadf221928100134978b69655f0cf37466e30a [36/40] io_uring: split out splice related operations
config: um-x86_64_defconfig (https://download.01.org/0day-ci/archive/20220525/202205251321.vRCtW7An-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/ammarfaizi2/linux-block/commit/22eadf221928100134978b69655f0cf37466e30a
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block axboe/linux-block/for-5.20/io_uring
        git checkout 22eadf221928100134978b69655f0cf37466e30a
        # 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@intel.com>

All warnings (new ones prefixed by >>):

>> io_uring/splice.c:42:5: warning: no previous prototype for 'io_tee_prep' [-Wmissing-prototypes]
      42 | int io_tee_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
         |     ^~~~~~~~~~~
>> io_uring/splice.c:49:5: warning: no previous prototype for 'io_tee' [-Wmissing-prototypes]
      49 | int io_tee(struct io_kiocb *req, unsigned int issue_flags)
         |     ^~~~~~
>> io_uring/splice.c:81:5: warning: no previous prototype for 'io_splice_prep' [-Wmissing-prototypes]
      81 | int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
         |     ^~~~~~~~~~~~~~
>> io_uring/splice.c:90:5: warning: no previous prototype for 'io_splice' [-Wmissing-prototypes]
      90 | int io_splice(struct io_kiocb *req, unsigned int issue_flags)
         |     ^~~~~~~~~


vim +/io_tee_prep +42 io_uring/splice.c

    41	
  > 42	int io_tee_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
    43	{
    44		if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off))
    45			return -EINVAL;
    46		return __io_splice_prep(req, sqe);
    47	}
    48	
  > 49	int io_tee(struct io_kiocb *req, unsigned int issue_flags)
    50	{
    51		struct io_splice *sp = io_kiocb_to_cmd(req);
    52		struct file *out = sp->file_out;
    53		unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
    54		struct file *in;
    55		long ret = 0;
    56	
    57		if (issue_flags & IO_URING_F_NONBLOCK)
    58			return -EAGAIN;
    59	
    60		if (sp->flags & SPLICE_F_FD_IN_FIXED)
    61			in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags);
    62		else
    63			in = io_file_get_normal(req, sp->splice_fd_in);
    64		if (!in) {
    65			ret = -EBADF;
    66			goto done;
    67		}
    68	
    69		if (sp->len)
    70			ret = do_tee(in, out, sp->len, flags);
    71	
    72		if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
    73			io_put_file(in);
    74	done:
    75		if (ret != sp->len)
    76			req_set_fail(req);
    77		io_req_set_res(req, ret, 0);
    78		return IOU_OK;
    79	}
    80	
  > 81	int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
    82	{
    83		struct io_splice *sp = io_kiocb_to_cmd(req);
    84	
    85		sp->off_in = READ_ONCE(sqe->splice_off_in);
    86		sp->off_out = READ_ONCE(sqe->off);
    87		return __io_splice_prep(req, sqe);
    88	}
    89	
  > 90	int io_splice(struct io_kiocb *req, unsigned int issue_flags)

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