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x86/apb_timer: Convert to hotplug state machine

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Install the callbacks via the state machine. There is no setup just one
teardown callback. Remove the silly comment about the workqueue up dependency.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
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/20160713153335.625342983@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Sebastian Andrzej Siewior 2016-07-13 17:16:34 +00:00 committed by Ingo Molnar
parent 251a5fd64b
commit 148b9e2abe
2 changed files with 11 additions and 19 deletions
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29
arch/x86/kernel/apb_timer.c
View file

@ -215,26 +215,18 @@ void apbt_setup_secondary_clock(void)
* cpu timers during the offline process due to the ordering of notification.
* the extra interrupt is harmless.
*/
static int apbt_cpuhp_notify(struct notifier_block *n,
unsigned long action, void *hcpu)
static int apbt_cpu_dead(unsigned int cpu)
{
unsigned long cpu = (unsigned long)hcpu;
struct apbt_dev *adev = &per_cpu(cpu_apbt_dev, cpu);
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_DEAD:
dw_apb_clockevent_pause(adev->timer);
if (system_state == SYSTEM_RUNNING) {
pr_debug("skipping APBT CPU %lu offline\n", cpu);
} else {
pr_debug("APBT clockevent for cpu %lu offline\n", cpu);
dw_apb_clockevent_stop(adev->timer);
}
break;
default:
pr_debug("APBT notified %lu, no action\n", action);
dw_apb_clockevent_pause(adev->timer);
if (system_state == SYSTEM_RUNNING) {
pr_debug("skipping APBT CPU %u offline\n", cpu);
} else {
pr_debug("APBT clockevent for cpu %u offline\n", cpu);
dw_apb_clockevent_stop(adev->timer);
}
return NOTIFY_OK;
return 0;
}
static __init int apbt_late_init(void)
@ -242,9 +234,8 @@ static __init int apbt_late_init(void)
if (intel_mid_timer_options == INTEL_MID_TIMER_LAPIC_APBT ||
!apb_timer_block_enabled)
return 0;
/* This notifier should be called after workqueue is ready */
hotcpu_notifier(apbt_cpuhp_notify, -20);
return 0;
return cpuhp_setup_state(CPUHP_X86_APB_DEAD, "X86_APB_DEAD", NULL,
apbt_cpu_dead);
}
fs_initcall(apbt_late_init);
#else

1
include/linux/cpuhotplug.h
View file

@ -13,6 +13,7 @@ enum cpuhp_state {
CPUHP_PERF_POWER,
CPUHP_PERF_SUPERH,
CPUHP_X86_HPET_DEAD,
CPUHP_X86_APB_DEAD,
CPUHP_WORKQUEUE_PREP,
CPUHP_NOTIFY_PREPARE,
CPUHP_BRINGUP_CPU,