From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 22 Oct 2008 07:48:06 +0000 (+0200)
Subject: Merge branch 'timers/range-hrtimers' into v28-range-hrtimers-for-linus-v2
X-Git-Url: http://git.maemo.org/git/?a=commitdiff_plain;h=268a3dcfea2077fca60d3715caa5c96f9b5e6ea7;p=h-e-n

Merge branch 'timers/range-hrtimers' into v28-range-hrtimers-for-linus-v2

Conflicts:

	kernel/time/tick-sched.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

268a3dcfea2077fca60d3715caa5c96f9b5e6ea7
diff --cc kernel/time/tick-sched.c
index 727c1ae,a547be1..5bbb104
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@@ -377,32 -377,6 +377,32 @@@ ktime_t tick_nohz_get_sleep_length(void
  	return ts->sleep_length;
  }
  
 +static void tick_nohz_restart(struct tick_sched *ts, ktime_t now)
 +{
 +	hrtimer_cancel(&ts->sched_timer);
- 	ts->sched_timer.expires = ts->idle_tick;
++	hrtimer_set_expires(&ts->sched_timer, ts->idle_tick);
 +
 +	while (1) {
 +		/* Forward the time to expire in the future */
 +		hrtimer_forward(&ts->sched_timer, now, tick_period);
 +
 +		if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
- 			hrtimer_start(&ts->sched_timer,
- 				      ts->sched_timer.expires,
++			hrtimer_start_expires(&ts->sched_timer,
 +				      HRTIMER_MODE_ABS);
 +			/* Check, if the timer was already in the past */
 +			if (hrtimer_active(&ts->sched_timer))
 +				break;
 +		} else {
- 			if (!tick_program_event(ts->sched_timer.expires, 0))
++			if (!tick_program_event(
++				hrtimer_get_expires(&ts->sched_timer), 0))
 +				break;
 +		}
 +		/* Update jiffies and reread time */
 +		tick_do_update_jiffies64(now);
 +		now = ktime_get();
 +	}
 +}
 +
  /**
   * tick_nohz_restart_sched_tick - restart the idle tick from the idle task
   *
@@@ -456,7 -430,28 +456,9 @@@ void tick_nohz_restart_sched_tick(void
  	 */
  	ts->tick_stopped  = 0;
  	ts->idle_exittime = now;
 -	hrtimer_cancel(&ts->sched_timer);
 -	hrtimer_set_expires(&ts->sched_timer, ts->idle_tick);
+ 
 -	while (1) {
 -		/* Forward the time to expire in the future */
 -		hrtimer_forward(&ts->sched_timer, now, tick_period);
 +	tick_nohz_restart(ts, now);
+ 
 -		if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
 -			hrtimer_start_expires(&ts->sched_timer,
 -				      HRTIMER_MODE_ABS);
 -			/* Check, if the timer was already in the past */
 -			if (hrtimer_active(&ts->sched_timer))
 -				break;
 -		} else {
 -			if (!tick_program_event(
 -				hrtimer_get_expires(&ts->sched_timer), 0))
 -				break;
 -		}
 -		/* Update jiffies and reread time */
 -		tick_do_update_jiffies64(now);
 -		now = ktime_get();
 -	}
  	local_irq_enable();
  }
  
@@@ -553,37 -552,6 +555,37 @@@ static void tick_nohz_switch_to_nohz(vo
  	       smp_processor_id());
  }
  
 +/*
 + * When NOHZ is enabled and the tick is stopped, we need to kick the
 + * tick timer from irq_enter() so that the jiffies update is kept
 + * alive during long running softirqs. That's ugly as hell, but
 + * correctness is key even if we need to fix the offending softirq in
 + * the first place.
 + *
 + * Note, this is different to tick_nohz_restart. We just kick the
 + * timer and do not touch the other magic bits which need to be done
 + * when idle is left.
 + */
 +static void tick_nohz_kick_tick(int cpu)
 +{
 +	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
 +	ktime_t delta, now;
 +
 +	if (!ts->tick_stopped)
 +		return;
 +
 +	/*
 +	 * Do not touch the tick device, when the next expiry is either
 +	 * already reached or less/equal than the tick period.
 +	 */
 +	now = ktime_get();
- 	delta =	ktime_sub(ts->sched_timer.expires, now);
++	delta =	ktime_sub(hrtimer_get_expires(&ts->sched_timer), now);
 +	if (delta.tv64 <= tick_period.tv64)
 +		return;
 +
 +	tick_nohz_restart(ts, now);
 +}
 +
  #else
  
  static inline void tick_nohz_switch_to_nohz(void) { }