diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c
index eb0dc9e5065f..d4c2292ea46b 100644
--- a/arch/csky/mm/init.c
+++ b/arch/csky/mm/init.c
@@ -60,22 +60,6 @@ void __init mem_init(void)
 	mem_init_print_info(NULL);
 }
 
-#ifdef CONFIG_BLK_DEV_INITRD
-void free_initrd_mem(unsigned long start, unsigned long end)
-{
-	if (start < end)
-		pr_info("Freeing initrd memory: %ldk freed\n",
-			(end - start) >> 10);
-
-	for (; start < end; start += PAGE_SIZE) {
-		ClearPageReserved(virt_to_page(start));
-		init_page_count(virt_to_page(start));
-		free_page(start);
-		totalram_pages_inc();
-	}
-}
-#endif
-
 extern char __init_begin[], __init_end[];
 
 void free_initmem(void)