genirq/cpuhotplug: Add sanity check for effective affinity mask

static inline bool irq_needs_fixup(struct irq_data *d)

{

	const struct cpumask *m = irq_data_get_effective_affinity_mask(d);

	unsigned int cpu = smp_processor_id();

	return cpumask_test_cpu(smp_processor_id(), m);

#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK

	/*

	 * The cpumask_empty() check is a workaround for interrupt chips,

	 * which do not implement effective affinity, but the architecture has

	 * enabled the config switch. Use the general affinity mask instead.

	 */

	if (cpumask_empty(m))

		m = irq_data_get_affinity_mask(d);

	/*

	 * Sanity check. If the mask is not empty when excluding the outgoing

	 * CPU then it must contain at least one online CPU. The outgoing CPU

	 * has been removed from the online mask already.

	 */

	if (cpumask_any_but(m, cpu) < nr_cpu_ids &&

	    cpumask_any_and(m, cpu_online_mask) >= nr_cpu_ids) {

		/*

		 * If this happens then there was a missed IRQ fixup at some

		 * point. Warn about it and enforce fixup.

		 */

		pr_warn("Eff. affinity %*pbl of IRQ %u contains only offline CPUs after offlining CPU %u\n",

			cpumask_pr_args(m), d->irq, cpu);

		return true;

	}

#endif

	return cpumask_test_cpu(cpu, m);

}

static bool migrate_one_irq(struct irq_desc *desc)