diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 0e8f476..f57cc7b 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -34,13 +34,7 @@
 	HRTIMER_RESTART,
 };
 
-/*
- * Timer states:
- */
-enum hrtimer_state {
-	HRTIMER_INACTIVE,		/* Timer is inactive */
-	HRTIMER_PENDING,		/* Timer is pending */
-};
+#define HRTIMER_INACTIVE	((void *)1UL)
 
 struct hrtimer_base;
 
@@ -61,7 +55,6 @@
 struct hrtimer {
 	struct rb_node		node;
 	ktime_t			expires;
-	enum hrtimer_state	state;
 	int			(*function)(void *);
 	void			*data;
 	struct hrtimer_base	*base;
@@ -124,7 +117,7 @@
 
 static inline int hrtimer_active(const struct hrtimer *timer)
 {
-	return timer->state == HRTIMER_PENDING;
+	return timer->node.rb_parent != HRTIMER_INACTIVE;
 }
 
 /* Forward a hrtimer so it expires after now: */
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 59ec50c..658d49f 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -374,8 +374,6 @@
 	rb_link_node(&timer->node, parent, link);
 	rb_insert_color(&timer->node, &base->active);
 
-	timer->state = HRTIMER_PENDING;
-
 	if (!base->first || timer->expires.tv64 <
 	    rb_entry(base->first, struct hrtimer, node)->expires.tv64)
 		base->first = &timer->node;
@@ -395,6 +393,7 @@
 	if (base->first == &timer->node)
 		base->first = rb_next(&timer->node);
 	rb_erase(&timer->node, &base->active);
+	timer->node.rb_parent = HRTIMER_INACTIVE;
 }
 
 /*
@@ -405,7 +404,6 @@
 {
 	if (hrtimer_active(timer)) {
 		__remove_hrtimer(timer, base);
-		timer->state = HRTIMER_INACTIVE;
 		return 1;
 	}
 	return 0;
@@ -579,6 +577,7 @@
 		clock_id = CLOCK_MONOTONIC;
 
 	timer->base = &bases[clock_id];
+	timer->node.rb_parent = HRTIMER_INACTIVE;
 }
 
 /**
@@ -625,7 +624,6 @@
 		fn = timer->function;
 		data = timer->data;
 		set_curr_timer(base, timer);
-		timer->state = HRTIMER_INACTIVE;
 		__remove_hrtimer(timer, base);
 		spin_unlock_irq(&base->lock);
 
@@ -633,12 +631,10 @@
 
 		spin_lock_irq(&base->lock);
 
-		/* Another CPU has added back the timer */
-		if (timer->state != HRTIMER_INACTIVE)
-			continue;
-
-		if (restart != HRTIMER_NORESTART)
+		if (restart != HRTIMER_NORESTART) {
+			BUG_ON(hrtimer_active(timer));
 			enqueue_hrtimer(timer, base);
+		}
 	}
 	set_curr_timer(base, NULL);
 	spin_unlock_irq(&base->lock);