--- kernel/time/tick-broadcast.c

+++ kernel/time/tick-broadcast.c

@@ -523,10 +523,11 @@ static void tick_broadcast_init_next_eve

*/

void tick_broadcast_setup_oneshot(struct clock_event_device *bc)

{

+ int cpu = smp_processor_id();

+

/* Set it up only once ! */

if (bc->event_handler != tick_handle_oneshot_broadcast) {

int was_periodic = bc->mode == CLOCK_EVT_MODE_PERIODIC;

- int cpu = smp_processor_id();

bc->event_handler = tick_handle_oneshot_broadcast;

clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);

@@ -552,6 +553,15 @@ void tick_broadcast_setup_oneshot(struct

tick_broadcast_set_event(tick_next_period, 1);

} else

bc->next_event.tv64 = KTIME_MAX;

+ } else {

+ /*

+ * The first cpu which switches to oneshot mode sets

+ * the bit for all other cpus which are in the general

+ * (periodic) broadcast mask. So the bit is set and

+ * would prevent the first broadcast enter after this

+ * to program the bc device.

+ */

+ tick_broadcast_clear_oneshot(cpu);

}

}

@@ -600,4 +610,14 @@ int tick_broadcast_oneshot_active(void)

return tick_broadcast_device.mode == TICKDEV_MODE_ONESHOT;

}

+/*

+ * Check whether the broadcast device supports oneshot.

+ */

+bool tick_broadcast_oneshot_available(void)

+{

+ struct clock_event_device *bc = tick_broadcast_device.evtdev;

+

+ return bc ? bc->features & CLOCK_EVT_FEAT_ONESHOT : false;

+}

+

#endif