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clockevents: Cleanup dead cpu explicitely

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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 cleanup function for a dead cpu and invoke it
directly from the cpu down code. Make it conditional on
CPU_HOTPLUG as well.

Temporary change, will be refined in the future.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[ Rebased, added clockevents_notify() removal ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1735025.raBZdQHM3m@vostro.rjw.lan
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner
2015-04-03 02:38:05 +02:00
committed by Ingo Molnar
parent 52c063d1ad
commit a49b116dcb
8 changed files with 52 additions and 66 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
kernel/time/tick-broadcast.c
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@@ -410,14 +410,14 @@ void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast)
dev->event_handler = tick_handle_periodic_broadcast;
}
#ifdef CONFIG_HOTPLUG_CPU
/*
* Remove a CPU from broadcasting
*/
void tick_shutdown_broadcast(unsigned int *cpup)
void tick_shutdown_broadcast(unsigned int cpu)
{
struct clock_event_device *bc;
unsigned long flags;
unsigned int cpu = *cpup;
raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
@@ -432,6 +432,7 @@ void tick_shutdown_broadcast(unsigned int *cpup)
raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
}
#endif
void tick_suspend_broadcast(void)
{
@@ -672,21 +673,6 @@ static void broadcast_shutdown_local(struct clock_event_device *bc,
clockevents_set_state(dev, CLOCK_EVT_STATE_SHUTDOWN);
}
void hotplug_cpu__broadcast_tick_pull(int deadcpu)
{
struct clock_event_device *bc;
unsigned long flags;
raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
bc = tick_broadcast_device.evtdev;
if (bc && broadcast_needs_cpu(bc, deadcpu)) {
/* This moves the broadcast assignment to this CPU: */
clockevents_program_event(bc, bc->next_event, 1);
}
raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
}
/**
* tick_broadcast_oneshot_control - Enter/exit broadcast oneshot mode
* @state: The target state (enter/exit)
@@ -908,14 +894,28 @@ void tick_broadcast_switch_to_oneshot(void)
raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
}
#ifdef CONFIG_HOTPLUG_CPU
void hotplug_cpu__broadcast_tick_pull(int deadcpu)
{
struct clock_event_device *bc;
unsigned long flags;
raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
bc = tick_broadcast_device.evtdev;
if (bc && broadcast_needs_cpu(bc, deadcpu)) {
/* This moves the broadcast assignment to this CPU: */
clockevents_program_event(bc, bc->next_event, 1);
}
raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
}
/*
* Remove a dead CPU from broadcasting
*/
void tick_shutdown_broadcast_oneshot(unsigned int *cpup)
void tick_shutdown_broadcast_oneshot(unsigned int cpu)
{
unsigned long flags;
unsigned int cpu = *cpup;
raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
@@ -929,6 +929,7 @@ void tick_shutdown_broadcast_oneshot(unsigned int *cpup)
raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
}
#endif
/*
* Check, whether the broadcast device is in one shot mode