clockevents: Provide explicit broadcast control functions
clockevents_notify() is a leftover from the early design of the
clockevents facility. It's really not a notification mechanism,
it's a multiplex call. We are way better off to have explicit
calls instead of this monstrosity.
Split out the broadcast control into a separate function and
provide inline helpers. Switch clockevents_notify() over. This
will go away once all callers are converted.
This also gets rid of the nested locking of clockevents_lock and
broadcast_lock. The broadcast control functions do not require
clockevents_lock. Only the managing functions
(setup/shutdown/suspend/resume of the broadcast device require
clockevents_lock.
Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Cc: Daniel Lezcano <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Tony Lindgren <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
diff --git a/include/linux/tick.h b/include/linux/tick.h
index f9ff225..4bb2363 100644
--- a/include/linux/tick.h
+++ b/include/linux/tick.h
@@ -42,6 +42,31 @@
static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { }
#endif
+enum tick_broadcast_mode {
+ TICK_BROADCAST_OFF,
+ TICK_BROADCAST_ON,
+ TICK_BROADCAST_FORCE,
+};
+
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
+extern void tick_broadcast_control(enum tick_broadcast_mode mode);
+#else
+static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { }
+#endif /* BROADCAST */
+
+static inline void tick_broadcast_enable(void)
+{
+ tick_broadcast_control(TICK_BROADCAST_ON);
+}
+static inline void tick_broadcast_disable(void)
+{
+ tick_broadcast_control(TICK_BROADCAST_OFF);
+}
+static inline void tick_broadcast_force(void)
+{
+ tick_broadcast_control(TICK_BROADCAST_FORCE);
+}
+
#ifdef CONFIG_NO_HZ_COMMON
extern int tick_nohz_tick_stopped(void);
extern void tick_nohz_idle_enter(void);
