ARM: CPU hotplug: fix abuse of irqdesc->node

irqdesc's node member is supposed to mark the numa node number for the
interrupt.  Our use of it is non-standard.  Remove this, replacing the
functionality with a test of the affinity mask.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/common/gic.c

@@ -189,7 +189,6 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
 	bit = 1 << (cpu + shift);
 
 	spin_lock(&irq_controller_lock);
-	d->node = cpu;
 	val = readl_relaxed(reg) & ~mask;
 	writel_relaxed(val | bit, reg);
 	spin_unlock(&irq_controller_lock);

arch/arm/kernel/irq.c

@@ -166,15 +166,9 @@ void migrate_irqs(void)
 		bool affinity_broken = false;
 
 		raw_spin_lock(&desc->lock);
-		do {
-			if (desc->action == NULL)
-				break;
-
-			if (d->node != cpu)
-				break;
-
+		if (desc->action != NULL &&
+		    cpumask_test_cpu(smp_processor_id(), d->affinity))
 			affinity_broken = migrate_one_irq(d);
-		} while (0);
 		raw_spin_unlock(&desc->lock);
 
 		if (affinity_broken && printk_ratelimit())