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s390/mm/pfault: Convert to hotplug state machine

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Install the callbacks via the state machine.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-s390@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: rt@linutronix.de
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Link: http://lkml.kernel.org/r/20160906170457.32393-18-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2016-09-06 19:04:53 +02:00 committed by Thomas Gleixner
parent e476d31291
commit 84c9ceefec
2 changed files with 13 additions and 18 deletions
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30
arch/s390/mm/fault.c
View File

@ -740,28 +740,21 @@ static void pfault_interrupt(struct ext_code ext_code,
put_task_struct(tsk);
}
static int pfault_cpu_notify(struct notifier_block *self, unsigned long action,
void *hcpu)
static int pfault_cpu_dead(unsigned int cpu)
{
struct thread_struct *thread, *next;
struct task_struct *tsk;
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_DEAD:
spin_lock_irq(&pfault_lock);
list_for_each_entry_safe(thread, next, &pfault_list, list) {
thread->pfault_wait = 0;
list_del(&thread->list);
tsk = container_of(thread, struct task_struct, thread);
wake_up_process(tsk);
put_task_struct(tsk);
}
spin_unlock_irq(&pfault_lock);
break;
default:
break;
spin_lock_irq(&pfault_lock);
list_for_each_entry_safe(thread, next, &pfault_list, list) {
thread->pfault_wait = 0;
list_del(&thread->list);
tsk = container_of(thread, struct task_struct, thread);
wake_up_process(tsk);
put_task_struct(tsk);
}
return NOTIFY_OK;
spin_unlock_irq(&pfault_lock);
return 0;
}
static int __init pfault_irq_init(void)
@ -775,7 +768,8 @@ static int __init pfault_irq_init(void)
if (rc)
goto out_pfault;
irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL);
hotcpu_notifier(pfault_cpu_notify, 0);
cpuhp_setup_state_nocalls(CPUHP_S390_PFAULT_DEAD, "s390/pfault:dead",
NULL, pfault_cpu_dead);
return 0;
out_pfault:

1
include/linux/cpuhotplug.h
View File

@ -26,6 +26,7 @@ enum cpuhp_state {
CPUHP_BLOCK_SOFTIRQ_DEAD,
CPUHP_VIRT_SCSI_DEAD,
CPUHP_ACPI_CPUDRV_DEAD,
CPUHP_S390_PFAULT_DEAD,
CPUHP_WORKQUEUE_PREP,
CPUHP_POWER_NUMA_PREPARE,
CPUHP_HRTIMERS_PREPARE,