diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index da7a2fe..5c660f5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5121,6 +5121,26 @@
 
 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 
+unsigned long free_reserved_area(unsigned long start, unsigned long end,
+				 int poison, char *s)
+{
+	unsigned long pages, pos;
+
+	pos = start = PAGE_ALIGN(start);
+	end &= PAGE_MASK;
+	for (pages = 0; pos < end; pos += PAGE_SIZE, pages++) {
+		if (poison)
+			memset((void *)pos, poison, PAGE_SIZE);
+		free_reserved_page(virt_to_page(pos));
+	}
+
+	if (pages && s)
+		pr_info("Freeing %s memory: %ldK (%lx - %lx)\n",
+			s, pages << (PAGE_SHIFT - 10), start, end);
+
+	return pages;
+}
+
 /**
  * set_dma_reserve - set the specified number of pages reserved in the first zone
  * @new_dma_reserve: The number of pages to mark reserved