diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index c36d8123ca14..c59a86dca584 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -60,8 +60,6 @@ init_IRQ(void)
 /*
  * Switch to the asynchronous interrupt stack for softirq execution.
  */
-extern void __do_softirq(void);
-
 asmlinkage void do_softirq(void)
 {
 	unsigned long flags, old, new;
diff --git a/arch/sh/kernel/irq.c b/arch/sh/kernel/irq.c
index 9bf19b00696a..a2a99e487e33 100644
--- a/arch/sh/kernel/irq.c
+++ b/arch/sh/kernel/irq.c
@@ -200,8 +200,6 @@ void irq_ctx_exit(int cpu)
 	hardirq_ctx[cpu] = NULL;
 }
 
-extern asmlinkage void __do_softirq(void);
-
 asmlinkage void do_softirq(void)
 {
 	unsigned long flags;
diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
index 00bda7bcda63..147352df28b9 100644
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -190,8 +190,6 @@ void irq_ctx_exit(int cpu)
 	hardirq_ctx[cpu] = NULL;
 }
 
-extern asmlinkage void __do_softirq(void);
-
 asmlinkage void do_softirq(void)
 {
 	unsigned long flags;
diff --git a/include/asm-powerpc/irq.h b/include/asm-powerpc/irq.h
index b5c03127a9b9..5089deb8fec3 100644
--- a/include/asm-powerpc/irq.h
+++ b/include/asm-powerpc/irq.h
@@ -619,8 +619,6 @@ struct pt_regs;
 
 #define __ARCH_HAS_DO_SOFTIRQ
 
-extern void __do_softirq(void);
-
 #ifdef CONFIG_IRQSTACKS
 /*
  * Per-cpu stacks for handling hard and soft interrupts.
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index b5fef13148bd..f1fc7470d26c 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -289,6 +289,7 @@ struct softirq_action
 };
 
 asmlinkage void do_softirq(void);
+asmlinkage void __do_softirq(void);
 extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data);
 extern void softirq_init(void);
 #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)