1 files changed, 43 insertions, 0 deletions

diff --git a/meta/recipes-kernel/linux/linux-omap-2.6.29/timer-suppression.patch b/meta/recipes-kernel/linux/linux-omap-2.6.29/timer-suppression.patch
new file mode 100644
index 0000000000..04362c96e3
--- /dev/null
+++ b/meta/recipes-kernel/linux/linux-omap-2.6.29/timer-suppression.patch
@@ -0,0 +1,43 @@
+diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
+index b854a89..26f5569 100644
+--- a/kernel/time/tick-sched.c
++++ b/kernel/time/tick-sched.c
+@@ -253,6 +253,16 @@ void tick_nohz_stop_sched_tick(void)
+ 
+        /* Schedule the tick, if we are at least one jiffie off */
+        if ((long)delta_jiffies >= 1) {
++               /*
++                * calculate the expiry time for the next timer wheel
++                * timer
++                */
++               expires = ktime_add_ns(last_update, tick_period.tv64 *
++                                       delta_jiffies);
++
++               /* Skip reprogram of event if its not changed */
++               if(ts->tick_stopped && ktime_equal(expires, dev->next_event))
++               goto out2;
+ 
+                if (delta_jiffies > 1)
+                        cpu_set(cpu, nohz_cpu_mask);
+@@ -304,12 +314,7 @@ void tick_nohz_stop_sched_tick(void)
+                        goto out;
+                }
+ 
+-               /*
+-                * calculate the expiry time for the next timer wheel
+-                * timer
+-                */
+-               expires = ktime_add_ns(last_update, tick_period.tv64 *
+-                                      delta_jiffies);
++               /* Mark expiries */
+                ts->idle_expires = expires;
+ 
+                if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
+@@ -328,6 +333,7 @@ void tick_nohz_stop_sched_tick(void)
+                tick_do_update_jiffies64(ktime_get());
+                cpu_clear(cpu, nohz_cpu_mask);
+        }
++out2:  
+        raise_softirq_irqoff(TIMER_SOFTIRQ);
+ out:
+        ts->next_jiffies = next_jiffies;