diff --git a/arch/s390/include/asm/hw_irq.h b/arch/s390/include/asm/hw_irq.h
index adae176..9078b5b 100644
--- a/arch/s390/include/asm/hw_irq.h
+++ b/arch/s390/include/asm/hw_irq.h
@@ -7,6 +7,5 @@
 
 void __init init_airq_interrupts(void);
 void __init init_cio_interrupts(void);
-void __init init_ext_interrupts(void);
 
 #endif
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index da550cb..3514420 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -95,14 +95,6 @@ static const struct irq_class irqclass_sub_desc[] = {
 	{.irq = CPU_RST,    .name = "RST", .desc = "[CPU] CPU Restart"},
 };
 
-void __init init_IRQ(void)
-{
-	BUILD_BUG_ON(ARRAY_SIZE(irqclass_sub_desc) != NR_ARCH_IRQS);
-	init_cio_interrupts();
-	init_airq_interrupts();
-	init_ext_interrupts();
-}
-
 void do_IRQ(struct pt_regs *regs, int irq)
 {
 	struct pt_regs *old_regs;
@@ -294,7 +286,7 @@ static irqreturn_t do_ext_interrupt(int irq, void *dummy)
 	return IRQ_HANDLED;
 }
 
-void __init init_ext_interrupts(void)
+static void __init init_ext_interrupts(void)
 {
 	int idx;
 
@@ -307,6 +299,14 @@ void __init init_ext_interrupts(void)
 		panic("Failed to register EXT interrupt\n");
 }
 
+void __init init_IRQ(void)
+{
+	BUILD_BUG_ON(ARRAY_SIZE(irqclass_sub_desc) != NR_ARCH_IRQS);
+	init_cio_interrupts();
+	init_airq_interrupts();
+	init_ext_interrupts();
+}
+
 static DEFINE_SPINLOCK(irq_subclass_lock);
 static unsigned char irq_subclass_refcount[64];