diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 97ac926..3f74c059 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -199,6 +199,26 @@
 static inline int check_wakeup_irqs(void) { return 0; }
 #endif
 
+/**
+ * struct irq_affinity_notify - context for notification of IRQ affinity changes
+ * @irq:		Interrupt to which notification applies
+ * @kref:		Reference count, for internal use
+ * @work:		Work item, for internal use
+ * @notify:		Function to be called on change.  This will be
+ *			called in process context.
+ * @release:		Function to be called on release.  This will be
+ *			called in process context.  Once registered, the
+ *			structure must only be freed when this function is
+ *			called or later.
+ */
+struct irq_affinity_notify {
+	unsigned int irq;
+	struct kref kref;
+	struct work_struct work;
+	void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
+	void (*release)(struct kref *ref);
+};
+
 #if defined(CONFIG_SMP)
 
 extern cpumask_var_t irq_default_affinity;
@@ -242,26 +262,6 @@
 
 extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
 
-/**
- * struct irq_affinity_notify - context for notification of IRQ affinity changes
- * @irq:		Interrupt to which notification applies
- * @kref:		Reference count, for internal use
- * @work:		Work item, for internal use
- * @notify:		Function to be called on change.  This will be
- *			called in process context.
- * @release:		Function to be called on release.  This will be
- *			called in process context.  Once registered, the
- *			structure must only be freed when this function is
- *			called or later.
- */
-struct irq_affinity_notify {
-	unsigned int irq;
-	struct kref kref;
-	struct work_struct work;
-	void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
-	void (*release)(struct kref *ref);
-};
-
 extern int
 irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
 
@@ -284,6 +284,12 @@
 {
 	return -EINVAL;
 }
+
+static inline int
+irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
+{
+	return 0;
+}
 #endif /* CONFIG_SMP */
 
 /*