[kas:hugeext4/v5 219/339] file.c:undefined reference to `dax_iomap_rw'

[kas:hugeext4/v5 219/339] file.c:undefined reference to `dax_iomap_rw'

[kbuild test robot]

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Hi Andrew,

It's probably a bug fix that unveils the link errors.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git hugeext4/v5
head:   db420786908155553b057eb4494cd8a111ba10bf
commit: b59aa3626a9fb545266bd77329e172f7a8ecf15b [219/339] linux-next-rejects
config: x86_64-randconfig-i0-201648 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout b59aa3626a9fb545266bd77329e172f7a8ecf15b
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   fs/built-in.o: In function `ext4_file_read_iter':
>> file.c:(.text+0xa0f4a): undefined reference to `dax_iomap_rw'
   fs/built-in.o: In function `ext4_dax_fault':
   file.c:(.text+0xa1220): undefined reference to `dax_iomap_fault'
   fs/built-in.o: In function `ext4_file_write_iter':
   file.c:(.text+0xa13a6): undefined reference to `dax_iomap_rw'
   fs/built-in.o: In function `ext4_block_zero_page_range':
>> inode.c:(.text+0xa7fa8): undefined reference to `iomap_zero_range'

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