diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index cd7606b..a6bb102 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -46,6 +46,8 @@
 #define memblock_dbg(fmt, ...) \
 	if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 
+phys_addr_t memblock_find_in_range_node(phys_addr_t start, phys_addr_t end,
+				phys_addr_t size, phys_addr_t align, int nid);
 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
 				   phys_addr_t size, phys_addr_t align);
 int memblock_free_reserved_regions(void);
@@ -98,6 +100,26 @@
 	     i != (u64)ULLONG_MAX;					\
 	     __next_free_mem_range(&i, nid, p_start, p_end, p_nid))
 
+void __next_free_mem_range_rev(u64 *idx, int nid, phys_addr_t *out_start,
+			       phys_addr_t *out_end, int *out_nid);
+
+/**
+ * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
+ * @i: u64 used as loop variable
+ * @nid: node selector, %MAX_NUMNODES for all nodes
+ * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
+ * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
+ * @p_nid: ptr to int for nid of the range, can be %NULL
+ *
+ * Walks over free (memory && !reserved) areas of memblock in reverse
+ * order.  Available as soon as memblock is initialized.
+ */
+#define for_each_free_mem_range_reverse(i, nid, p_start, p_end, p_nid)	\
+	for (i = (u64)ULLONG_MAX,					\
+	     __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid);	\
+	     i != (u64)ULLONG_MAX;					\
+	     __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid))
+
 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 int memblock_set_node(phys_addr_t base, phys_addr_t size, int nid);
 
@@ -121,8 +143,6 @@
 }
 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 
-phys_addr_t memblock_find_in_range_node(phys_addr_t start, phys_addr_t end,
-					phys_addr_t size, phys_addr_t align, int nid);
 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);