diff options
Diffstat (limited to 'meta/recipes-kernel/linux/linux-omap2-git/beagleboard/timer-suppression.patch')
-rw-r--r-- | meta/recipes-kernel/linux/linux-omap2-git/beagleboard/timer-suppression.patch | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/meta/recipes-kernel/linux/linux-omap2-git/beagleboard/timer-suppression.patch b/meta/recipes-kernel/linux/linux-omap2-git/beagleboard/timer-suppression.patch new file mode 100644 index 0000000000..04362c96e3 --- /dev/null +++ b/meta/recipes-kernel/linux/linux-omap2-git/beagleboard/timer-suppression.patch | |||
@@ -0,0 +1,43 @@ | |||
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; | ||