diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 7690547..35022dc 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -375,7 +375,7 @@
 }
 #endif /* CONFIG_BLK_DEV_INITRD */
 
-void __init parse_setup_data(void)
+static void __init parse_setup_data(void)
 {
 	struct setup_data *data;
 	u64 pa_data;
@@ -417,7 +417,7 @@
 	return total << PAGE_SHIFT;
 }
 
-void __init reserve_crashkernel(void)
+static void __init reserve_crashkernel(void)
 {
 	unsigned long long total_mem;
 	unsigned long long crash_size, crash_base;
@@ -453,7 +453,7 @@
 	}
 }
 #else
-void __init reserve_crashkernel(void)
+static void __init reserve_crashkernel(void)
 {
 }
 #endif
@@ -481,7 +481,7 @@
 		.flags = IORESOURCE_BUSY | IORESOURCE_IO }
 };
 
-void __init reserve_standard_io_resources(void)
+static void __init reserve_standard_io_resources(void)
 {
 	int i;