[ext4:dev 21/26] file.c:undefined reference to `dax_iomap_fault'

[kbuild test robot <fengguang.wu@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
head:   19b29dca7eef735531a2448e692bb1658c351887
commit: 8b72e1435cd73926cba767fba3e957807a97069c [21/26] ext4: convert DAX faults to iomap infrastructure
config: i386-randconfig-sb0-11212318 (attached as .config)
compiler: gcc-5 (Debian 5.4.1-2) 5.4.1 20160904
reproduce:
        git checkout 8b72e1435cd73926cba767fba3e957807a97069c
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   fs/built-in.o: In function `ext4_dax_fault':
>> file.c:(.text+0x529f3): undefined reference to `dax_iomap_fault'
   fs/built-in.o: In function `ext4_file_read_iter':
   file.c:(.text+0x52bab): undefined reference to `dax_iomap_rw'
   fs/built-in.o: In function `ext4_file_write_iter':
   file.c:(.text+0x52dff): undefined reference to `dax_iomap_rw'
   fs/built-in.o: In function `ext4_block_zero_page_range':
   inode.c:(.text+0x57c8e): undefined reference to `iomap_zero_range'

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