1 files changed, 16 insertions, 4 deletions

diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index ea9f5ad9ec8e..763ba81fc0f0 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -13,12 +13,12 @@ struct mem_section;
 #ifdef CONFIG_MEMORY_HOTPLUG
 
 /*
- * Magic number for free bootmem.
+ * Types for free bootmem.
  * The normal smallest mapcount is -1. Here is smaller value than it.
  */
-#define SECTION_INFO            0xfffffffe
-#define MIX_INFO                0xfffffffd
-#define NODE_INFO               0xfffffffc
+#define SECTION_INFO            (-1 - 1)
+#define MIX_SECTION_INFO        (-1 - 2)
+#define NODE_INFO               (-1 - 3)
 
 /*
  * pgdat resizing functions
@@ -199,6 +199,18 @@ extern int walk_memory_resource(unsigned long start_pfn,
                         unsigned long nr_pages, void *arg,
                         int (*func)(unsigned long, unsigned long, void *));
 
+#ifdef CONFIG_MEMORY_HOTREMOVE
+
+extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
+
+#else
+static inline int is_mem_section_removable(unsigned long pfn,
+                                        unsigned long nr_pages)
+{
+        return 0;
+}
+#endif /* CONFIG_MEMORY_HOTREMOVE */
+
 extern int add_memory(int nid, u64 start, u64 size);
 extern int arch_add_memory(int nid, u64 start, u64 size);
 extern int remove_memory(u64 start, u64 size);