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clockevents: Make tick handover explicit

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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 tick_handover call and invoke it explicitely from
the hotplug code. Temporary solution will be cleaned up in later
patches.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[ Rebase ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1658173.RkEEILFiQZ@vostro.rjw.lan
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner
2015-04-03 02:37:24 +02:00
committed by Ingo Molnar
parent ffa48c0d76
commit 52c063d1ad
7 changed files with 10 additions and 13 deletions
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9
kernel/time/tick-common.c
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@@ -332,20 +332,23 @@ void tick_check_new_device(struct clock_event_device *newdev)
tick_install_broadcast_device(newdev);
}
#ifdef CONFIG_HOTPLUG_CPU
/*
* Transfer the do_timer job away from a dying cpu.
*
* Called with interrupts disabled.
* Called with interrupts disabled. Not locking required. If
* tick_do_timer_cpu is owned by this cpu, nothing can change it.
*/
void tick_handover_do_timer(int *cpup)
void tick_handover_do_timer(void)
{
if (*cpup == tick_do_timer_cpu) {
if (tick_do_timer_cpu == smp_processor_id()) {
int cpu = cpumask_first(cpu_online_mask);
tick_do_timer_cpu = (cpu < nr_cpu_ids) ? cpu :
TICK_DO_TIMER_NONE;
}
}
#endif
/*
* Shutdown an event device on a given cpu: