recipes/linux/linux-omap/timer-suppression.patch

   1 diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
   2 index b854a89..26f5569 100644
   3 --- a/kernel/time/tick-sched.c
   4 +++ b/kernel/time/tick-sched.c
   5 @@ -253,6 +253,16 @@ void tick_nohz_stop_sched_tick(void)
   6
   7         /* Schedule the tick, if we are at least one jiffie off */
   8         if ((long)delta_jiffies >= 1) {
   9 +               /*
  10 +                * calculate the expiry time for the next timer wheel
  11 +                * timer
  12 +                */
  13 +               expires = ktime_add_ns(last_update, tick_period.tv64 *
  14 +                                       delta_jiffies);
  15 +
  16 +               /* Skip reprogram of event if its not changed */
  17 +               if(ts->tick_stopped && ktime_equal(expires, dev->next_event))
  18 +               goto out2;
  19
  20                 if (delta_jiffies > 1)
  21                         cpu_set(cpu, nohz_cpu_mask);
  22 @@ -304,12 +314,7 @@ void tick_nohz_stop_sched_tick(void)
  23                         goto out;
  24                 }
  25
  26 -               /*
  27 -                * calculate the expiry time for the next timer wheel
  28 -                * timer
  29 -                */
  30 -               expires = ktime_add_ns(last_update, tick_period.tv64 *
  31 -                                      delta_jiffies);
  32 +               /* Mark expiries */
  33                 ts->idle_expires = expires;
  34
  35                 if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
  36 @@ -328,6 +333,7 @@ void tick_nohz_stop_sched_tick(void)
  37                 tick_do_update_jiffies64(ktime_get());
  38                 cpu_clear(cpu, nohz_cpu_mask);
  39         }
  40 +out2:
  41         raise_softirq_irqoff(TIMER_SOFTIRQ);
  42  out:
  43         ts->next_jiffies = next_jiffies;