Merge branch 'linux-2.6'

[linux-2.6-omap-h63xx.git] / kernel / time / tick-sched.c

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 8c3fef1db09ccb03507a89de6cbd7971dd803f41..cb89fa8db110a98df702bbd4bed884d1b45b25dd 100644 (file)
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -133,6 +133,8 @@ void tick_nohz_update_jiffies(void)
        if (!ts->tick_stopped)
                return;
 
+       touch_softlockup_watchdog();
+
        cpu_clear(cpu, nohz_cpu_mask);
        now = ktime_get();
 
@@ -153,6 +155,7 @@ void tick_nohz_stop_sched_tick(void)
        unsigned long seq, last_jiffies, next_jiffies, delta_jiffies, flags;
        struct tick_sched *ts;
        ktime_t last_update, expires, now, delta;
+       struct clock_event_device *dev = __get_cpu_var(tick_cpu_device).evtdev;
        int cpu;
 
        local_irq_save(flags);
@@ -302,12 +305,25 @@ void tick_nohz_stop_sched_tick(void)
 out:
        ts->next_jiffies = next_jiffies;
        ts->last_jiffies = last_jiffies;
+       ts->sleep_length = ktime_sub(dev->next_event, now);
 end:
        local_irq_restore(flags);
 }
 
 /**
- * nohz_restart_sched_tick - restart the idle tick from the idle task
+ * tick_nohz_get_sleep_length - return the length of the current sleep
+ *
+ * Called from power state control code with interrupts disabled
+ */
+ktime_t tick_nohz_get_sleep_length(void)
+{
+       struct tick_sched *ts = &__get_cpu_var(tick_cpu_sched);
+
+       return ts->sleep_length;
+}
+
+/**
+ * tick_nohz_restart_sched_tick - restart the idle tick from the idle task
  *
  * Restart the idle tick when the CPU is woken up from idle
  */
@@ -570,7 +586,7 @@ void tick_setup_sched_timer(void)
        /* Get the next period (per cpu) */
        ts->sched_timer.expires = tick_init_jiffy_update();
        offset = ktime_to_ns(tick_period) >> 1;
-       do_div(offset, NR_CPUS);
+       do_div(offset, num_possible_cpus());
        offset *= smp_processor_id();
        ts->sched_timer.expires = ktime_add_ns(ts->sched_timer.expires, offset);