X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=kernel%2Ftime%2Ftick-sched.c;h=10a1347597fd394fec309d1ae74663ae2d9ae05c;hb=c4ec20717313daafba59225f812db89595952b83;hp=ce89ffb474d0cbeba8b2d84af5c3a6c9ae5f7389;hpb=5c8e191e8437616a498a8e1cc0af3dd0d32bbff2;p=linux-2.6-omap-h63xx.git

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index ce89ffb474d..10a1347597f 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -153,6 +153,7 @@ 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);
@@ -302,10 +303,25 @@ 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);
 }
 
+/**
+ * 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;
+}
+
+EXPORT_SYMBOL_GPL(tick_nohz_get_sleep_length);
+
 /**
  * nohz_restart_sched_tick - restart the idle tick from the idle task
  *