ARM: OMAP: Undo next_timer_interrupt() fix for hrtimer

Undo patch bd9dac30 as a
better patch is now available.

include/linux/hrtimer.h

@@ -115,7 +115,6 @@ extern int hrtimer_try_to_cancel(struct hrtimer *timer);
 /* Query timers: */
 extern ktime_t hrtimer_get_remaining(const struct hrtimer *timer);
 extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp);
-extern int hrtimer_next_jiffie(unsigned long *next_jiffie);
 
 static inline int hrtimer_active(const struct hrtimer *timer)
 {

kernel/hrtimer.c

@@ -505,79 +505,6 @@ ktime_t hrtimer_get_remaining(const struct hrtimer *timer)
 	return rem;
 }
 
-#ifdef CONFIG_NO_IDLE_HZ
-
-/**
- * hrtimer_get_next - get next hrtimer to expire
- *
- * @bases:	ktimer base array
- */
-static inline struct hrtimer * hrtimer_get_next(struct hrtimer_base *bases)
-{
-	unsigned long flags;
-	struct hrtimer *timer = NULL;
-	int i;
-
-	for (i = 0; i < MAX_HRTIMER_BASES; i++) {
-		struct hrtimer_base *base;
-		struct hrtimer *cur;
-
-		base = &bases[i];
-		spin_lock_irqsave(&base->lock, flags);
-		cur = rb_entry(base->first, struct hrtimer, node);
-		spin_unlock_irqrestore(&base->lock, flags);
-
-		if (cur == NULL)
-			continue;
-
-		if (timer == NULL || cur->expires.tv64 < timer->expires.tv64)
-			timer = cur;
-	}
-
-	return timer;
-}
-
-/**
- * ktime_to_jiffies - converts ktime to jiffies
- *
- * @event:	ktime event to be converted to jiffies
- *
- * Caller must take care xtime locking.
- */
-static inline unsigned long ktime_to_jiffies(const ktime_t event)
-{
-	ktime_t now, delta;
-
-	now = timespec_to_ktime(xtime);
-	delta = ktime_sub(event, now);
-
-	return jiffies + (((delta.tv64 * NSEC_CONVERSION) >>
-			(NSEC_JIFFIE_SC - SEC_JIFFIE_SC)) >> SEC_JIFFIE_SC);
-}
-
-/**
- * hrtimer_next_jiffie - get next hrtimer event in jiffies
- *
- * Called from next_timer_interrupt() to get the next hrtimer event.
- * Eventually we should change next_timer_interrupt() to return
- * results in nanoseconds instead of jiffies. Caller must host xtime_lock.
- */
-int hrtimer_next_jiffie(unsigned long *next_jiffie)
-{
-	struct hrtimer_base *base = __get_cpu_var(hrtimer_bases);
-	struct hrtimer * timer;
-
-	timer = hrtimer_get_next(base);
-	if (timer == NULL)
-		return -EAGAIN;
-
-	*next_jiffie = ktime_to_jiffies(timer->expires);
-
-	return 0;
-}
-
-#endif
-
 /**
  * hrtimer_init - initialize a timer to the given clock
  *

kernel/timer.c

@@ -478,7 +478,6 @@ static inline void __run_timers(tvec_base_t *base)
 }
 
 #ifdef CONFIG_NO_IDLE_HZ
-
 /*
  * Find out when the next timer event is due to happen. This
  * is used on S/390 to stop all activity when a cpus is idle.
@@ -490,15 +489,9 @@ unsigned long next_timer_interrupt(void)
 	struct list_head *list;
 	struct timer_list *nte;
 	unsigned long expires;
-	unsigned long hr_expires = jiffies + 10 * HZ;	/* Anything far ahead */
 	tvec_t *varray[4];
 	int i, j;
 
-	/* Look for timer events in hrtimer. */
-	if ((hrtimer_next_jiffie(&hr_expires) == 0)
-		&& (time_before(hr_expires, jiffies + 2)))
-			return hr_expires;
-
 	base = &__get_cpu_var(tvec_bases);
 	spin_lock(&base->t_base.lock);
 	expires = base->timer_jiffies + (LONG_MAX >> 1);
@@ -549,10 +542,6 @@ found:
 		}
 	}
 	spin_unlock(&base->t_base.lock);
-
-	if (time_before(hr_expires, expires))
-		expires = hr_expires;
-
 	return expires;
 }
 #endif