clockevents: Make suspend/resume calls explicit
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 suspend/resume() calls and invoke
them directly from the call sites.
No locking required at this point because these calls happen
with interrupts disabled and a single cpu online.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[ Rebased on top of 4.0-rc5. ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/713674030.jVm1qaHuPf@vostro.rjw.lan
[ Rebased on top of latest timers/core. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index a5b8771..1a60c2a 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -373,18 +373,39 @@
}
}
+/**
+ * tick_suspend - Suspend the tick and the broadcast device
+ *
+ * Called from syscore_suspend() via timekeeping_suspend with only one
+ * CPU online and interrupts disabled or from tick_unfreeze() under
+ * tick_freeze_lock.
+ *
+ * No locks required. Nothing can change the per cpu device.
+ */
void tick_suspend(void)
{
struct tick_device *td = this_cpu_ptr(&tick_cpu_device);
clockevents_shutdown(td->evtdev);
+ tick_suspend_broadcast();
}
+/**
+ * tick_resume - Resume the tick and the broadcast device
+ *
+ * Called from syscore_resume() via timekeeping_resume with only one
+ * CPU online and interrupts disabled or from tick_unfreeze() under
+ * tick_freeze_lock.
+ *
+ * No locks required. Nothing can change the per cpu device.
+ */
void tick_resume(void)
{
- struct tick_device *td = this_cpu_ptr(&tick_cpu_device);
- int broadcast = tick_resume_broadcast();
+ struct tick_device *td;
+ int broadcast;
+ broadcast = tick_resume_broadcast();
+ td = this_cpu_ptr(&tick_cpu_device);
clockevents_tick_resume(td->evtdev);
if (!broadcast) {
@@ -416,7 +437,6 @@
timekeeping_suspend();
} else {
tick_suspend();
- tick_suspend_broadcast();
}
raw_spin_unlock(&tick_freeze_lock);