[axboe-block:rw_iter 9/12] fs/tracefs/inode.c:56:9: 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:   8e8fd62fac9e105d05cfda66070e98a3a255e1a0
commit: bb285b16cf180b4178bb9a45a8ffbf1ca5d9a701 [9/12] fs: convert remaining users of ->read and ->write to iterator variants
config: arm-defconfig (https://download.01.org/0day-ci/archive/20240404/202404040725.9Abdcjc9-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/20240404/202404040725.9Abdcjc9-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/202404040725.9Abdcjc9-lkp@intel.com/

All errors (new ones prefixed by >>):

>> fs/tracefs/inode.c:56:9: 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 +56 fs/tracefs/inode.c

    53	
    54	static ssize_t default_write_file_iter(struct kiocb *iocb, struct iov_iter *from)
    55	{
  > 56		return iov_iter_count(from);
    57	}
    58	

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