Hi Mike,

[auto build test ERROR on linus/master]
[also build test ERROR on next-20160804]
[cannot apply to v4.7]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Mike-Christie/mm-block-convert-rw_page-users-to-bio-op-use/20160805-012041
config: i386-tinyconfig (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   mm/filemap.c: In function 'page_endio':

quoted

mm/filemap.c:892:7: error: implicit declaration of function 'op_is_write' [-Werror=implicit-function-declaration]

     if (!op_is_write(op)) {
          ^~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/op_is_write +892 mm/filemap.c

   886	/*
   887	 * After completing I/O on a page, call this routine to update the page
   888	 * flags appropriately
   889	 */
   890	void page_endio(struct page *page, int op, int err)
   891	{
 > 892		if (!op_is_write(op)) {
   893			if (!err) {
   894				SetPageUptodate(page);
   895			} else {

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