diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 3fa93dc7fe75..9c25feba7c40 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -507,7 +507,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
  * System memory should not be in /proc/iomem but various tools expect it
  * (eg kdump).
  */
-static int add_system_ram_resources(void)
+static int __init add_system_ram_resources(void)
 {
 	struct memblock_region *reg;