diff options
| author | Richard Cochran <rcochran@linutronix.de> | 2016-07-13 17:17:07 +0000 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-07-15 10:41:45 +0200 |
| commit | eb0a9d8c672dc01db41352afa646405d035ee7a4 (patch) | |
| tree | a30810cffa2779d02c7a289f1d6b49d3694ee47b /drivers/clocksource | |
| parent | 2c48fef74ca42d05c3efd4345b8a068ebf479a5f (diff) | |
| download | linux-eb0a9d8c672dc01db41352afa646405d035ee7a4.tar.gz | |
clocksource/atlas7: Convert to hotplug state machine
Install the callbacks via the state machine and let the core invoke the callbacks on the already online CPUs. Signed-off-by: Richard Cochran <rcochran@linutronix.de> Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de> Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Barry Song <baohua@kernel.org> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: rt@linutronix.de Link: http://lkml.kernel.org/r/20160713153338.310333816@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/clocksource')
| -rw-r--r-- | drivers/clocksource/timer-atlas7.c | 41 |
1 files changed, 9 insertions, 32 deletions
diff --git a/drivers/clocksource/timer-atlas7.c b/drivers/clocksource/timer-atlas7.c index 90f8fbc154a4..4334e0330ada 100644 --- a/drivers/clocksource/timer-atlas7.c +++ b/drivers/clocksource/timer-atlas7.c @@ -172,9 +172,9 @@ static struct irqaction sirfsoc_timer1_irq = { .handler = sirfsoc_timer_interrupt, }; -static int sirfsoc_local_timer_setup(struct clock_event_device *ce) +static int sirfsoc_local_timer_starting_cpu(unsigned int cpu) { - int cpu = smp_processor_id(); + struct clock_event_device *ce = per_cpu_ptr(sirfsoc_clockevent, cpu); struct irqaction *action; if (cpu == 0) @@ -203,50 +203,27 @@ static int sirfsoc_local_timer_setup(struct clock_event_device *ce) return 0; } -static void sirfsoc_local_timer_stop(struct clock_event_device *ce) +static int sirfsoc_local_timer_dying_cpu(unsigned int cpu) { - int cpu = smp_processor_id(); - sirfsoc_timer_count_disable(1); if (cpu == 0) remove_irq(sirfsoc_timer_irq.irq, &sirfsoc_timer_irq); else remove_irq(sirfsoc_timer1_irq.irq, &sirfsoc_timer1_irq); + return 0; } -static int sirfsoc_cpu_notify(struct notifier_block *self, - unsigned long action, void *hcpu) -{ - /* - * Grab cpu pointer in each case to avoid spurious - * preemptible warnings - */ - switch (action & ~CPU_TASKS_FROZEN) { - case CPU_STARTING: - sirfsoc_local_timer_setup(this_cpu_ptr(sirfsoc_clockevent)); - break; - case CPU_DYING: - sirfsoc_local_timer_stop(this_cpu_ptr(sirfsoc_clockevent)); - break; - } - - return NOTIFY_OK; -} - -static struct notifier_block sirfsoc_cpu_nb = { - .notifier_call = sirfsoc_cpu_notify, -}; - static int __init sirfsoc_clockevent_init(void) { sirfsoc_clockevent = alloc_percpu(struct clock_event_device); BUG_ON(!sirfsoc_clockevent); - BUG_ON(register_cpu_notifier(&sirfsoc_cpu_nb)); - - /* Immediately configure the timer on the boot CPU */ - return sirfsoc_local_timer_setup(this_cpu_ptr(sirfsoc_clockevent)); + /* Install and invoke hotplug callbacks */ + return cpuhp_setup_state(CPUHP_AP_MARCO_TIMER_STARTING, + "AP_MARCO_TIMER_STARTING", + sirfsoc_local_timer_starting_cpu, + sirfsoc_local_timer_dying_cpu); } /* initialize the kernel jiffy timer source */ |