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-rw-r--r--kernel/time/tick-common.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index c34021650..5edfb48 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -205,6 +205,17 @@ static void tick_setup_device(struct tick_device *td,
tick_setup_oneshot(newdev, handler, next_event);
}
+void tick_install_replacement(struct clock_event_device *newdev)
+{
+ struct tick_device *td = &__get_cpu_var(tick_cpu_device);
+ int cpu = smp_processor_id();
+
+ clockevents_exchange_device(td->evtdev, newdev);
+ tick_setup_device(td, newdev, cpu, cpumask_of(cpu));
+ if (newdev->features & CLOCK_EVT_FEAT_ONESHOT)
+ tick_oneshot_notify();
+}
+
static bool tick_check_percpu(struct clock_event_device *curdev,
struct clock_event_device *newdev, int cpu)
{
@@ -237,6 +248,19 @@ static bool tick_check_preferred(struct clock_event_device *curdev,
}
/*
+ * Check whether the new device is a better fit than curdev. curdev
+ * can be NULL !
+ */
+bool tick_check_replacement(struct clock_event_device *curdev,
+ struct clock_event_device *newdev)
+{
+ if (tick_check_percpu(curdev, newdev, smp_processor_id()))
+ return false;
+
+ return tick_check_preferred(curdev, newdev);
+}
+
+/*
* Check, if the new registered device should be used. Called with
* clockevents_lock held and interrupts disabled.
*/