1 files changed, 28 insertions, 0 deletions

diff --git a/arch/i386/mm/discontig.c b/arch/i386/mm/discontig.c
index 103b76e56a94..e0c390d6ceb5 100644
--- a/arch/i386/mm/discontig.c
+++ b/arch/i386/mm/discontig.c
@@ -405,3 +405,31 @@ void __init set_highmem_pages_init(int bad_ppro)
         totalram_pages += totalhigh_pages;
 #endif
 }
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+int paddr_to_nid(u64 addr)
+{
+        int nid;
+        unsigned long pfn = PFN_DOWN(addr);
+
+        for_each_node(nid)
+                if (node_start_pfn[nid] <= pfn &&
+                    pfn < node_end_pfn[nid])
+                        return nid;
+
+        return -1;
+}
+
+/*
+ * This function is used to ask node id BEFORE memmap and mem_section's
+ * initialization (pfn_to_nid() can't be used yet).
+ * If _PXM is not defined on ACPI's DSDT, node id must be found by this.
+ */
+int memory_add_physaddr_to_nid(u64 addr)
+{
+        int nid = paddr_to_nid(addr);
+        return (nid >= 0) ? nid : 0;
+}
+
+EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
+#endif