[PATCH] libnvdimm, pmem: fix ia64 build, use PHYS_PFN

[Dan Williams]

   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),

ia64 does not provide __phys_to_pfn(), just use the PHYS_PFN() alias.

Cc: Guenter Roeck <li...@roeck-us.net>
Reported-by: kbuild test robot <fengguang...@intel.com>
Signed-off-by: Dan Williams <dan.j.willi...@intel.com>
---
 drivers/nvdimm/pmem.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 0cb450e1b400..74e2569910d8 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -407,15 +407,15 @@ static int nvdimm_namespace_detach_pfn(struct 
nd_namespace_common *ndns)
  */
 static unsigned long init_altmap_base(resource_size_t base)
 {
-       unsigned long base_pfn = __phys_to_pfn(base);
+       unsigned long base_pfn = PHYS_PFN(base);
 
        return PFN_SECTION_ALIGN_DOWN(base_pfn);
 }
 
 static unsigned long init_altmap_reserve(resource_size_t base)
 {
-       unsigned long reserve = __phys_to_pfn(SZ_8K);
-       unsigned long base_pfn = __phys_to_pfn(base);
+       unsigned long reserve = PHYS_PFN(SZ_8K);
+       unsigned long base_pfn = PHYS_PFN(base);
 
        reserve += base_pfn - PFN_SECTION_ALIGN_DOWN(base_pfn);
        return reserve;
@@ -458,7 +458,7 @@ static int __nvdimm_namespace_attach_pfn(struct nd_pfn 
*nd_pfn)
                                        le64_to_cpu(nd_pfn->pfn_sb->npfns),
                                        nd_pfn->npfns);
                altmap = & __altmap;
-               altmap->free = __phys_to_pfn(pmem->data_offset - SZ_8K);
+               altmap->free = PHYS_PFN(pmem->data_offset - SZ_8K);
                altmap->alloc = 0;
        } else {
                rc = -ENXIO;