[axboe-block:rw_iter 5/10] fs/debugfs/file.c:36:9: error: implicit declaration of function 'iov_iter_count' is invalid in C99

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git rw_iter
head:   8b68c0bba37e427ceb23ae39861ba6816fdec1f9
commit: 9c9b194abb1f6b266a4db14859611801811cf0b3 [5/10] debugfs: convert to ->read_iter()
config: arm-defconfig (https://download.01.org/0day-ci/archive/20240404/202404040448.aafNQ1ic-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project.git f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240404/202404040448.aafNQ1ic-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404040448.aafNQ1ic-lkp@intel.com/

All errors (new ones prefixed by >>):

>> fs/debugfs/file.c:36:9: error: implicit declaration of function 'iov_iter_count' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
           return iov_iter_count(from);
                  ^
   1 error generated.


vim +/iov_iter_count +36 fs/debugfs/file.c

    33	
    34	static ssize_t default_write_file_iter(struct kiocb *iocb, struct iov_iter *from)
    35	{
  > 36		return iov_iter_count(from);
    37	}
    38	

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