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Commit c8761e20 authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by David Vrabel
Browse files

xen/events: Convert to hotplug state machine 



Install the callbacks via the state machine.

Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
parent 4d737042

drivers/xen/events/events_fifo.c

+12 −22
Original line number Diff line number Diff line
@@ -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;

		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;

include/linux/cpuhotplug.h

+1 −0
Original line number Diff line number Diff line
@@ -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,