drivers/nvdimm/pmem.c:367:3: error: implicit declaration of function '__phys_to_pfn'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   12b9fa6a97b3150477ab182e321be512b59fa899
commit: d2c0f041e1bb1260629ecea2161adb9778945aa3 libnvdimm, pfn, pmem: allocate memmap array in persistent memory
date:   6 weeks ago
config: ia64-allmodconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout d2c0f041e1bb1260629ecea2161adb9778945aa3
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

All errors (new ones prefixed by >>):

   drivers/nvdimm/pmem.c: In function 'nvdimm_namespace_attach_pfn':
>> drivers/nvdimm/pmem.c:367:3: error: implicit declaration of function '__phys_to_pfn' [-Werror=implicit-function-declaration]
      .base_pfn = __phys_to_pfn(nsio->res.start),
      ^
   cc1: some warnings being treated as errors

vim +/__phys_to_pfn +367 drivers/nvdimm/pmem.c

   361		struct vmem_altmap *altmap;
   362		struct nd_pfn_sb *pfn_sb;
   363		struct pmem_device *pmem;
   364		phys_addr_t offset;
   365		int rc;
   366		struct vmem_altmap __altmap = {
 > 367			.base_pfn = __phys_to_pfn(nsio->res.start),
   368			.reserve = __phys_to_pfn(SZ_8K),
   369		};
   370	

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