diff --git a/include/linux/swap.h b/include/linux/swap.h
index 389e7bd..ac43d87 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -157,6 +157,7 @@
 #define SWAP_HAS_CACHE	0x40	/* Flag page is cached, in first swap_map */
 #define SWAP_CONT_MAX	0x7f	/* Max count, in each swap_map continuation */
 #define COUNT_CONTINUED	0x80	/* See swap_map continuation for full count */
+#define SWAP_MAP_SHMEM	0xbf	/* Owned by shmem/tmpfs, in first swap_map */
 
 /*
  * The in-memory structure used to track swap areas.
@@ -316,6 +317,7 @@
 extern swp_entry_t get_swap_page_of_type(int);
 extern int valid_swaphandles(swp_entry_t, unsigned long *);
 extern int add_swap_count_continuation(swp_entry_t, gfp_t);
+extern void swap_shmem_alloc(swp_entry_t);
 extern int swap_duplicate(swp_entry_t);
 extern int swapcache_prepare(swp_entry_t);
 extern void swap_free(swp_entry_t);
@@ -394,6 +396,10 @@
 	return 0;
 }
 
+static inline void swap_shmem_alloc(swp_entry_t swp)
+{
+}
+
 static inline int swap_duplicate(swp_entry_t swp)
 {
 	return 0;