Hi Andreas,

I love your patch! Yet something to improve:

[auto build test ERROR on ceph-client/for-linus]
[also build test ERROR on ext4/dev xfs-linux/for-next linus/master v5.5-rc5]
[cannot apply to f2fs/dev-test rw-ubifs/next btrfs/next next-20200109]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Andreas-Gruenbacher/fs-Fix-page_mkwrite-off-by-one-errors/20200110-033920
base:   https://github.com/ceph/ceph-client.git for-linus
config: sh-rsk7269_defconfig (attached as .config)
compiler: sh4-linux-gcc (GCC) 7.5.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.5.0 make.cross ARCH=sh 

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

All errors (new ones prefixed by >>):

   fs/buffer.o: In function `block_page_mkwrite':
   buffer.c:(.text+0x2bd0): undefined reference to `page_mkwrite_check_truncate'
   fs/iomap/buffered-io.o: In function `iomap_page_mkwrite':
>> buffered-io.c:(.text+0x2460): undefined reference to `page_mkwrite_check_truncate'
   fs/ext4/inode.o: In function `ext4_page_mkwrite':
>> inode.c:(.text+0x7478): undefined reference to `page_mkwrite_check_truncate'

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0-DAY kernel test infrastructure                 Open Source Technology Center
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