diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 5f71bfd6d66..4473d699c5e 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -11,6 +11,9 @@ struct zone;
 struct pglist_data;
 struct mem_section;
 
+extern unsigned long movable_reserved_start, movable_reserved_size;
+extern unsigned long low_power_memory_start, low_power_memory_size;
+
 #ifdef CONFIG_MEMORY_HOTPLUG
 
 /*
@@ -245,3 +248,5 @@ extern int physical_remove_memory(u64 start, u64 size);
 extern int arch_physical_remove_memory(u64 start, u64 size);
 extern int physical_low_power_memory(u64 start, u64 size);
 extern int arch_physical_low_power_memory(u64 start, u64 size);
+extern int physical_active_memory(u64 start, u64 size);
+extern int arch_physical_active_memory(u64 start, u64 size);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index b633ab01d47..7bd35716223 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -684,7 +684,6 @@ int __ref physical_remove_memory(u64 start, u64 size)
 	res = kzalloc(sizeof(struct resource), GFP_KERNEL);
 	BUG_ON(!res);
 
-	/* call arch's memory hotremove */
 	ret = arch_physical_remove_memory(start, size);
 	if (ret) {
 		kfree(res);
@@ -705,11 +704,19 @@ int __ref physical_remove_memory(u64 start, u64 size)
 }
 EXPORT_SYMBOL_GPL(physical_remove_memory);
 
+int __ref physical_active_memory(u64 start, u64 size)
+{
+	int ret;
+
+	ret = arch_physical_active_memory(start, size);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(physical_active_memory);
+
 int __ref physical_low_power_memory(u64 start, u64 size)
 {
 	int ret;
 
-	/* call arch's memory low power routine */
 	ret = arch_physical_low_power_memory(start, size);
 	return ret;
 }