[dhowells-fs:fscache-netfs-lib 2/28] mm/page-writeback.c:2847: warning: expecting prototype for Wait for a page to complete writeback(). Prototype was for wait_on_page_writeback_killable() instead

[dhowells-fs:fscache-netfs-lib 2/28] mm/page-writeback.c:2847: warning: expecting prototype for Wait for a page to complete writeback(). Prototype was for wait_on_page_writeback_killable() instead

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git fscache-netfs-lib
head:   fc307ae9cffffb17be171fb6613a788746e0b564
commit: a9e1626c4d3c876c864422ac4388d859dcb801c0 [2/28] mm: Add wait_on_page_writeback_killable()
config: x86_64-randconfig-a012-20210323 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 78a65cd945d006ff02f9d24d9cc20a302ed93b08)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit/?id=a9e1626c4d3c876c864422ac4388d859dcb801c0
        git remote add dhowells-fs https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
        git fetch --no-tags dhowells-fs fscache-netfs-lib
        git checkout a9e1626c4d3c876c864422ac4388d859dcb801c0
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> mm/page-writeback.c:2847: warning: expecting prototype for Wait for a page to complete writeback(). Prototype was for wait_on_page_writeback_killable() instead


vim +2847 mm/page-writeback.c

  2835	
  2836	/**
  2837	 * Wait for a page to complete writeback
  2838	 * @page: The page to wait on
  2839	 *
  2840	 * Wait for the writeback status of a page to clear or a fatal signal to occur.
  2841	 *
  2842	 * Return:
  2843	 * - 0 on success.
  2844	 * - -EINTR if a fatal signal was encountered.
  2845	 */
  2846	int wait_on_page_writeback_killable(struct page *page)
> 2847	{
  2848		int ret = 0;
  2849	
  2850		while (PageWriteback(page)) {
  2851			trace_wait_on_page_writeback(page, page_mapping(page));
  2852			ret = wait_on_page_bit_killable(page, PG_writeback);
  2853			if (ret < 0)
  2854				break;
  2855		}
  2856	
  2857		return ret;
  2858	}
  2859	EXPORT_SYMBOL(wait_on_page_writeback_killable);
  2860	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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