s390/mm: mark free_initrd_mem() as __init

Same as 0d26d1d8 "x86/mm: Mark free_initrd_mem() as __init".
In addition also add the __init annotation to setup_zero_pages().

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 6adbc08..81e596c 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -42,7 +42,7 @@
 unsigned long empty_zero_page, zero_page_mask;
 EXPORT_SYMBOL(empty_zero_page);
 
-static unsigned long setup_zero_pages(void)
+static unsigned long __init setup_zero_pages(void)
 {
 	struct cpuid cpu_id;
 	unsigned int order;
@@ -212,7 +212,7 @@
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
-void free_initrd_mem(unsigned long start, unsigned long end)
+void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
 	free_init_pages("initrd memory", start, end);
 }