diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index f89df52..cc7fe66 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -71,3 +71,10 @@
 			(unsigned long)(&__init_begin),
 			(unsigned long)(&__init_end));
 }
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+	free_init_pages("initrd memory", start, end);
+}
+#endif