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xen/events: Convert to hotplug state machine 

Install the callbacks via the state machine.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Sebastian Andrzej Siewior 2016-09-07 13:19:01 -04:00 committed by David Vrabel
parent 4d737042d6
commit c8761e2016
2 changed files with 13 additions and 22 deletions
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34
drivers/xen/events/events_fifo.c
View File

@ -418,30 +418,18 @@ static int evtchn_fifo_alloc_control_block(unsigned cpu)
return ret;
}
static int evtchn_fifo_cpu_notification(struct notifier_block *self,
unsigned long action,
void *hcpu)
static int xen_evtchn_cpu_prepare(unsigned int cpu)
{
int cpu = (long)hcpu;
int ret = 0;
switch (action) {
case CPU_UP_PREPARE:
if (!per_cpu(cpu_control_block, cpu))
ret = evtchn_fifo_alloc_control_block(cpu);
break;
case CPU_DEAD:
__evtchn_fifo_handle_events(cpu, true);
break;
default:
break;
}
return ret < 0 ? NOTIFY_BAD : NOTIFY_OK;
if (!per_cpu(cpu_control_block, cpu))
return evtchn_fifo_alloc_control_block(cpu);
return 0;
}
static struct notifier_block evtchn_fifo_cpu_notifier = {
.notifier_call = evtchn_fifo_cpu_notification,
};
static int xen_evtchn_cpu_dead(unsigned int cpu)
{
__evtchn_fifo_handle_events(cpu, true);
return 0;
}
int __init xen_evtchn_fifo_init(void)
{
@ -456,7 +444,9 @@ int __init xen_evtchn_fifo_init(void)
evtchn_ops = &evtchn_ops_fifo;
register_cpu_notifier(&evtchn_fifo_cpu_notifier);
cpuhp_setup_state_nocalls(CPUHP_XEN_EVTCHN_PREPARE,
"CPUHP_XEN_EVTCHN_PREPARE",
xen_evtchn_cpu_prepare, xen_evtchn_cpu_dead);
out:
put_cpu();
return ret;

1
include/linux/cpuhotplug.h
View File

@ -22,6 +22,7 @@ enum cpuhp_state {
CPUHP_SMPCFD_PREPARE,
CPUHP_RCUTREE_PREP,
CPUHP_XEN_PREPARE,
CPUHP_XEN_EVTCHN_PREPARE,
CPUHP_NOTIFY_PREPARE,
CPUHP_TIMERS_DEAD,
CPUHP_BRINGUP_CPU,