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| author | Thomas Gleixner <tglx@linutronix.de> | 2015-04-03 02:37:24 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-04-03 08:44:36 +0200 |
| commit | 52c063d1adbc16c76e70fffa20727fcd4e9343b3 (patch) | |
| tree | 08e2f8c56e9e972082adbeda1fe3cff646a45f4e /kernel/time | |
| parent | ffa48c0d76803057ee89bf220305466d74256d7b (diff) | |
| download | blackbird-obmc-linux-52c063d1adbc16c76e70fffa20727fcd4e9343b3.tar.gz blackbird-obmc-linux-52c063d1adbc16c76e70fffa20727fcd4e9343b3.zip | |
clockevents: Make tick handover 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 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>
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/clockevents.c | 4 | ||||
| -rw-r--r-- | kernel/time/hrtimer.c | 4 | ||||
| -rw-r--r-- | kernel/time/tick-common.c | 9 | ||||
| -rw-r--r-- | kernel/time/tick-internal.h | 1 |
4 files changed, 6 insertions, 12 deletions
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c index be9abf32c0b9..88fb3b96c7cc 100644 --- a/kernel/time/clockevents.c +++ b/kernel/time/clockevents.c @@ -655,10 +655,6 @@ int clockevents_notify(unsigned long reason, void *arg) raw_spin_lock_irqsave(&clockevents_lock, flags); switch (reason) { - case CLOCK_EVT_NOTIFY_CPU_DYING: - tick_handover_do_timer(arg); - break; - case CLOCK_EVT_NOTIFY_CPU_DEAD: tick_shutdown_broadcast_oneshot(arg); tick_shutdown_broadcast(arg); diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c index 721d29b99d10..6a7a64ec7d1b 100644 --- a/kernel/time/hrtimer.c +++ b/kernel/time/hrtimer.c @@ -1707,10 +1707,6 @@ static int hrtimer_cpu_notify(struct notifier_block *self, break; #ifdef CONFIG_HOTPLUG_CPU - case CPU_DYING: - case CPU_DYING_FROZEN: - clockevents_notify(CLOCK_EVT_NOTIFY_CPU_DYING, &scpu); - break; case CPU_DEAD: case CPU_DEAD_FROZEN: { diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c index e28ba5c044c5..055c868f3ec9 100644 --- a/kernel/time/tick-common.c +++ b/kernel/time/tick-common.c @@ -332,20 +332,23 @@ out_bc: 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: diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h index 0266f9dbd114..aabcb5d00cf2 100644 --- a/kernel/time/tick-internal.h +++ b/kernel/time/tick-internal.h @@ -20,7 +20,6 @@ extern int tick_do_timer_cpu __read_mostly; extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast); extern void tick_handle_periodic(struct clock_event_device *dev); extern void tick_check_new_device(struct clock_event_device *dev); -extern void tick_handover_do_timer(int *cpup); extern void tick_shutdown(unsigned int *cpup); extern void tick_suspend(void); extern void tick_resume(void); |
