pmem.c:undefined reference to `nd_dax_probe'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   9fe68cad6e74967b88d0c6aeca7d9cd6b6e91942
commit: e476f94482fc20a23b7b33b3d8e50f1953f71828 Merge branch 'for-4.9/dax' into libnvdimm-for-next
date:   3 weeks ago
config: x86_64-randconfig-s4-10261936 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout e476f94482fc20a23b7b33b3d8e50f1953f71828
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `to_nd_device_type':
   bus.c:(.text+0xe4322): undefined reference to `is_nd_dax'
   drivers/built-in.o: In function `nd_region_notify_driver_action.constprop.5':
   region_devs.c:(.text+0xe77d8): undefined reference to `is_nd_dax'
   region_devs.c:(.text+0xe77e9): undefined reference to `to_nd_dax'
   drivers/built-in.o: In function `nd_region_probe':
   region.c:(.text+0xe79fd): undefined reference to `nd_dax_create'
   drivers/built-in.o: In function `mode_show':
   namespace_devs.c:(.text+0xe83ef): undefined reference to `is_nd_dax'
   drivers/built-in.o: In function `nvdimm_namespace_common_probe':
   (.text+0xe9cb3): undefined reference to `is_nd_dax'
   drivers/built-in.o: In function `nvdimm_namespace_common_probe':
   (.text+0xe9cc1): undefined reference to `to_nd_dax'
   drivers/built-in.o: In function `nd_region_create_dax_seed':
   (.text+0xea74b): undefined reference to `nd_dax_create'
   drivers/built-in.o: In function `to_nd_pfn_safe':
   (.text+0xed2bb): undefined reference to `is_nd_dax'
   drivers/built-in.o: In function `to_nd_pfn_safe':
   (.text+0xed2c7): undefined reference to `to_nd_dax'
   drivers/built-in.o: In function `nd_namespace_store':
   (.text+0xed3db): undefined reference to `is_nd_dax'
   drivers/built-in.o: In function `nd_namespace_store':
   (.text+0xed621): undefined reference to `is_nd_dax'
   drivers/built-in.o: In function `nvdimm_setup_pfn':
   (.text+0xee7d1): undefined reference to `is_nd_dax'
   drivers/built-in.o: In function `nvdimm_setup_pfn':
   (.text+0xee816): undefined reference to `is_nd_dax'
   drivers/built-in.o: In function `nd_pmem_probe':
>> pmem.c:(.text+0xef898): undefined reference to `nd_dax_probe'

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