Re: [PATCH 15/21] iomap: Convert iomap_write_begin and iomap_write_end to folios

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

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Hi "Matthew,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on hnaz-mm/master]
[also build test ERROR on axboe-block/for-next linus/master next-20211101]
[cannot apply to xfs-linux/for-next djwong-xfs/djwong-devel v5.15]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Matthew-Wilcox-Oracle/iomap-xfs-folio-patches/20211102-052926
base:   https://github.com/hnaz/linux-mm master
config: sparc64-randconfig-r035-20211101 (attached as .config)
compiler: sparc64-linux-gcc (GCC) 11.2.0
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
        # https://github.com/0day-ci/linux/commit/b3cbfa38e55d041252c57ee712d1bbb146a4aee8
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Matthew-Wilcox-Oracle/iomap-xfs-folio-patches/20211102-052926
        git checkout b3cbfa38e55d041252c57ee712d1bbb146a4aee8
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=sparc64 

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

All errors (new ones prefixed by >>):

   fs/iomap/buffered-io.c: In function '__iomap_write_end':
>> fs/iomap/buffered-io.c:657:9: error: implicit declaration of function 'flush_dcache_folio'; did you mean 'flush_dcache_page'? [-Werror=implicit-function-declaration]
     657 |         flush_dcache_folio(folio);
         |         ^~~~~~~~~~~~~~~~~~
         |         flush_dcache_page
   cc1: some warnings being treated as errors


vim +657 fs/iomap/buffered-io.c

   652	
   653	static size_t __iomap_write_end(struct inode *inode, loff_t pos, size_t len,
   654			size_t copied, struct folio *folio)
   655	{
   656		struct iomap_page *iop = to_iomap_page(folio);
 > 657		flush_dcache_folio(folio);
   658	
   659		/*
   660		 * The blocks that were entirely written will now be uptodate, so we
   661		 * don't have to worry about a readpage reading them and overwriting a
   662		 * partial write.  However, if we've encountered a short write and only
   663		 * partially written into a block, it will not be marked uptodate, so a
   664		 * readpage might come in and destroy our partial write.
   665		 *
   666		 * Do the simplest thing and just treat any short write to a
   667		 * non-uptodate page as a zero-length write, and force the caller to
   668		 * redo the whole thing.
   669		 */
   670		if (unlikely(copied < len && !folio_test_uptodate(folio)))
   671			return 0;
   672		iomap_set_range_uptodate(folio, iop, offset_in_folio(folio, pos), len);
   673		filemap_dirty_folio(inode->i_mapping, folio);
   674		return copied;
   675	}
   676	

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

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