[akpm-mm:mm-unstable 288/290] mm/vmalloc.c:3448:8: warning: no previous prototype for 'zero_iter'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
head:   39aca4f17e02ee4076b6ab327577c9b1be23775d
commit: d9cab54f77377439e766e1c5916f79ec2ee27a6c [288/290] mm: vmalloc: convert vread() to vread_iter()
config: i386-randconfig-a001 (https://download.01.org/0day-ci/archive/20230323/202303230226.NucKb3B7-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/commit/?id=d9cab54f77377439e766e1c5916f79ec2ee27a6c
        git remote add akpm-mm https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git
        git fetch --no-tags akpm-mm mm-unstable
        git checkout d9cab54f77377439e766e1c5916f79ec2ee27a6c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303230226.NucKb3B7-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/vmalloc.c:3448:8: warning: no previous prototype for 'zero_iter' [-Wmissing-prototypes]
    3448 | size_t zero_iter(struct iov_iter *iter, size_t count)
         |        ^~~~~~~~~


vim +/zero_iter +3448 mm/vmalloc.c

  3442	
  3443	/*
  3444	 * Atomically zero bytes in the iterator.
  3445	 *
  3446	 * Returns the number of zeroed bytes.
  3447	 */
> 3448	size_t zero_iter(struct iov_iter *iter, size_t count)
  3449	{
  3450		size_t remains = count;
  3451	
  3452		while (remains > 0) {
  3453			size_t num, copied;
  3454	
  3455			num = remains < PAGE_SIZE ? remains : PAGE_SIZE;
  3456			copied = copy_page_to_iter_atomic(ZERO_PAGE(0), 0, num, iter);
  3457			remains -= copied;
  3458	
  3459			if (copied < num)
  3460				break;
  3461		}
  3462	
  3463		return count - remains;
  3464	}
  3465	

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