xfs_iomap.c:undefined reference to `put_dax'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   cd636458904a04de2349c728323c5d2af1203bdf
commit: ef51042472f55b325fd7f2b26a2e29fd89757234 block, dax: move "select DAX" from BLOCK to FS_DAX
date:   5 days ago
config: ia64-bigsur_defconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 6.2.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout ef51042472f55b325fd7f2b26a2e29fd89757234
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

All errors (new ones prefixed by >>):

   fs/built-in.o: In function `xfs_file_iomap_end':
>> xfs_iomap.c:(.text+0x2e3022): undefined reference to `put_dax'
   fs/built-in.o: In function `xfs_file_iomap_begin':
>> xfs_iomap.c:(.text+0x2e4502): undefined reference to `dax_get_by_host'

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