2 files changed, 7 insertions, 18 deletions

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 0e8f4762f6f8..f57cc7bd7008 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -34,13 +34,7 @@ enum hrtimer_restart {
         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_base;
 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 @@ extern ktime_t hrtimer_get_next_event(void);
 
 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 59ec50c1e905..658d49feedb9 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -374,8 +374,6 @@ static void enqueue_hrtimer(struct hrtimer *timer, struct hrtimer_base *base)
         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 @@ static void __remove_hrtimer(struct hrtimer *timer, struct hrtimer_base *base)
         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 @@ remove_hrtimer(struct hrtimer *timer, struct hrtimer_base *base)
 {
         if (hrtimer_active(timer)) {
                 __remove_hrtimer(timer, base);
-                timer->state = HRTIMER_INACTIVE;
                 return 1;
         }
         return 0;
@@ -579,6 +577,7 @@ void hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
                 clock_id = CLOCK_MONOTONIC;
 
         timer->base = &bases[clock_id];
+        timer->node.rb_parent = HRTIMER_INACTIVE;
 }
 
 /**
@@ -625,7 +624,6 @@ static inline void run_hrtimer_queue(struct hrtimer_base *base)
                 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 @@ static inline void run_hrtimer_queue(struct hrtimer_base *base)
 
                 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);