commit 217b7d5d38bf2d2a34187e46e2f72d778a0e4b42
Author: Corcodel Marian <asd@marian1000.go.ro>
Date:   Tue Jul 5 13:32:06 2016 +0300

     Try to stall 0 cycles on __remove_hrtimer.

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index fa0b983..ddc34f2 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -889,13 +889,19 @@ static int enqueue_hrtimer(struct hrtimer *timer,
  * reprogram to zero. This is useful, when the context does a reprogramming
  * anyway (e.g. timer interrupt)
  */
-static void __remove_hrtimer(struct hrtimer *timer,
+static inline void __remove_hrtimer(struct hrtimer *timer,
 			     struct hrtimer_clock_base *base,
 			     u8 newstate, int reprogram)
 {
-	struct hrtimer_cpu_base *cpu_base = base->cpu_base;
-	u8 state = timer->state;
+	struct hrtimer_cpu_base *cpu_base;
+	u8 state;
+
+	if (!base->cpu_base) {
+		return;
+	}
 
+	state = timer->state;
+	cpu_base = base->cpu_base;
 	timer->state = newstate;
 	if (!(state & HRTIMER_STATE_ENQUEUED))
 		return;