Hi "Matthew, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on next-20210715] [cannot apply to hnaz-linux-mm/master xfs-linux/for-next tip/perf/core v5.14-rc1] [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/Memory-fol... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 8096acd7442e613fad0354fc8dfdb2003cceea0b config: arm-randconfig-r014-20210715 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 0e49c54a8cbd3e779e5526a5888c683c01cc3c50) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/0day-ci/linux/commit/fd265884da3f65758e8b5153d45537a4b... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Matthew-Wilcox-Oracle/Memory-folios/20210715-133101 git checkout fd265884da3f65758e8b5153d45537a4bbefbb70 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): flush_dcache_folio(folio); ^ fs/iomap/buffered-io.c:645:2: note: did you mean 'flush_dcache_page'? arch/arm/include/asm/cacheflush.h:292:13: note: 'flush_dcache_page' declared here extern void flush_dcache_page(struct page *); ^ 1 error generated. vim +/flush_dcache_folio +645 fs/iomap/buffered-io.c 640 641 static size_t __iomap_write_end(struct inode *inode, loff_t pos, size_t len, 642 size_t copied, struct folio *folio) 643 { 644 struct iomap_page *iop = to_iomap_page(folio); 646 647 /* 648 * The blocks that were entirely written will now be uptodate, so we 649 * don't have to worry about a readpage reading them and overwriting a 650 * partial write. However if we have encountered a short write and only 651 * partially written into a block, it will not be marked uptodate, so a 652 * readpage might come in and destroy our partial write. 653 * 654 * Do the simplest thing, and just treat any short write to a non 655 * uptodate page as a zero-length write, and force the caller to redo 656 * the whole thing. 657 */ 658 if (unlikely(copied < len && !folio_test_uptodate(folio))) 659 return 0; 660 iomap_set_range_uptodate(folio, iop, offset_in_folio(folio, pos), len); 661 filemap_dirty_folio(inode->i_mapping, folio); 662 return copied; 663 } 664 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org