2 files changed, 13 insertions, 3 deletions

diff --git a/include/asm-ia64/nodedata.h b/include/asm-ia64/nodedata.h
index a140310bf84d..2fb337b0e9b7 100644
--- a/include/asm-ia64/nodedata.h
+++ b/include/asm-ia64/nodedata.h
@@ -46,6 +46,18 @@ struct ia64_node_data {
  */
 #define NODE_DATA(nid)          (local_node_data->pg_data_ptrs[nid])
 
+/*
+ * LOCAL_DATA_ADDR - This is to calculate the address of other node's
+ *                   "local_node_data" at hot-plug phase. The local_node_data
+ *                   is pointed by per_cpu_page. Kernel usually use it for
+ *                   just executing cpu. However, when new node is hot-added,
+ *                   the addresses of local data for other nodes are necessary
+ *                   to update all of them.
+ */
+#define LOCAL_DATA_ADDR(pgdat)                          \
+        ((struct ia64_node_data *)((u64)(pgdat) +       \
+                                   L1_CACHE_ALIGN(sizeof(struct pglist_data))))
+
 #endif /* CONFIG_NUMA */
 
 #endif /* _ASM_IA64_NODEDATA_H */
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 569b1f6c27d1..9b6260007e5e 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -91,9 +91,7 @@ static inline pg_data_t *arch_alloc_nodedata(int nid)
 static inline void arch_free_nodedata(pg_data_t *pgdat)
 {
 }
-static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
-{
-}
+extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
 
 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */