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Commit cb9644bf authored by Stefano Stabellini's avatar Stefano Stabellini Committed by David Vrabel
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xen/arm: don't try to re-register vcpu_info on cpu_hotplug. 



Call disable_percpu_irq on CPU_DYING and enable_percpu_irq when the cpu
is coming up.

Signed-off-by: default avatarStefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: default avatarJulien Grall <julien.grall@citrix.com>
parent 1c7a6213

arch/arm/xen/enlighten.c

+12 −0
Original line number Diff line number Diff line
@@ -86,6 +86,14 @@ static void xen_percpu_init(void) 
	int err;

	int cpu = get_cpu();



	/* 

	 * VCPUOP_register_vcpu_info cannot be called twice for the same

	 * vcpu, so if vcpu_info is already registered, just get out. This

	 * can happen with cpu-hotplug.

	 */

	if (per_cpu(xen_vcpu, cpu) != NULL)

		goto after_register_vcpu_info;



	pr_info("Xen: initializing cpu%d\n", cpu);

	vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
@@ -96,6 +104,7 @@ static void xen_percpu_init(void) 
	BUG_ON(err);

	per_cpu(xen_vcpu, cpu) = vcpup;



after_register_vcpu_info:

	enable_percpu_irq(xen_events_irq, 0);

	put_cpu();

}
@@ -124,6 +133,9 @@ static int xen_cpu_notification(struct notifier_block *self, 
	case CPU_STARTING:

		xen_percpu_init();

		break;

	case CPU_DYING:

		disable_percpu_irq(xen_events_irq);

		break;

	default:

		break;

	}