Hi Christoph, I love your patch! Yet something to improve: [auto build test ERROR on linus/master] [cannot apply to xfs-linux/for-next device-mapper-dm/for-next tytso-ext4/dev v5.15 next-20211111] [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/Christoph-Hellwig/nvdimm-pmem-mo... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git d2f38a3c6507b2520101f9a3807ed98f1bdc545a config: um-i386_defconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/5ea2c91584999019cd215022cca4d292c... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Christoph-Hellwig/nvdimm-pmem-move-dax_attribute_group-from-dax-to-pmem/20211109-173316 git checkout 5ea2c91584999019cd215022cca4d292c9296294 # save the attached .config to linux build tree make W=1 ARCH=um SUBARCH=i386 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 >>): fs/ext4/inode.c: In function 'ext4_block_zero_page_range': 3786 | return dax_zero_range(inode, from, length, NULL, | ^~~~~~~~~~~~~~ | iomap_zero_range cc1: some warnings being treated as errors vim +3786 fs/ext4/inode.c 3762 3763 /* 3764 * ext4_block_zero_page_range() zeros out a mapping of length 'length' 3765 * starting from file offset 'from'. The range to be zero'd must 3766 * be contained with in one block. If the specified range exceeds 3767 * the end of the block it will be shortened to end of the block 3768 * that corresponds to 'from' 3769 */ 3770 static int ext4_block_zero_page_range(handle_t *handle, 3771 struct address_space *mapping, loff_t from, loff_t length) 3772 { 3773 struct inode *inode = mapping->host; 3774 unsigned offset = from & (PAGE_SIZE-1); 3775 unsigned blocksize = inode->i_sb->s_blocksize; 3776 unsigned max = blocksize - (offset & (blocksize - 1)); 3777 3778 /* 3779 * correct length if it does not fall between 3780 * 'from' and the end of the block 3781 */ 3782 if (length > max || length < 0) 3783 length = max; 3784 3785 if (IS_DAX(inode)) { 3787 &ext4_iomap_ops); 3788 } 3789 return __ext4_block_zero_page_range(handle, mapping, from, length); 3790 } 3791 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org