libnvdimm, e820: fix numa node for e820-type-12 pmem ranges

Rather than punt on the numa node for these e820 ranges try to find a
better answer with memory_add_physaddr_to_nid() when it is available.

Cc: <stable@vger.kernel.org>
Reported-by: NBoaz Harrosh <boaz@plexistor.com>
Tested-by: NBoaz Harrosh <boaz@plexistor.com>
Signed-off-by: NDan Williams <dan.j.williams@intel.com>

drivers/nvdimm/e820.c

@@ -3,6 +3,7 @@
  * Copyright (c) 2015, Intel Corporation.
  */
 #include <linux/platform_device.h>
+#include <linux/memory_hotplug.h>
 #include <linux/libnvdimm.h>
 #include <linux/module.h>
 
@@ -25,6 +26,18 @@ static int e820_pmem_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_MEMORY_HOTPLUG
+static int e820_range_to_nid(resource_size_t addr)
+{
+	return memory_add_physaddr_to_nid(addr);
+}
+#else
+static int e820_range_to_nid(resource_size_t addr)
+{
+	return NUMA_NO_NODE;
+}
+#endif
+
 static int e820_pmem_probe(struct platform_device *pdev)
 {
 	static struct nvdimm_bus_descriptor nd_desc;
@@ -48,7 +61,7 @@ static int e820_pmem_probe(struct platform_device *pdev)
 		memset(&ndr_desc, 0, sizeof(ndr_desc));
 		ndr_desc.res = p;
 		ndr_desc.attr_groups = e820_pmem_region_attribute_groups;
-		ndr_desc.numa_node = NUMA_NO_NODE;
+		ndr_desc.numa_node = e820_range_to_nid(p->start);
 		set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
 		if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
 			goto err;