int migrate_platform_irqs()

in kernel/smpboot.c [596:634]

• 27 lines of code
• 7 McCabe index (conditional complexity)

int migrate_platform_irqs(unsigned int cpu)
{
	int new_cpei_cpu;
	struct irq_data *data = NULL;
	const struct cpumask *mask;
	int 		retval = 0;

	/*
	 * dont permit CPEI target to removed.
	 */
	if (cpe_vector > 0 && is_cpu_cpei_target(cpu)) {
		printk ("CPU (%d) is CPEI Target\n", cpu);
		if (can_cpei_retarget()) {
			/*
			 * Now re-target the CPEI to a different processor
			 */
			new_cpei_cpu = cpumask_any(cpu_online_mask);
			mask = cpumask_of(new_cpei_cpu);
			set_cpei_target_cpu(new_cpei_cpu);
			data = irq_get_irq_data(ia64_cpe_irq);
			/*
			 * Switch for now, immediately, we need to do fake intr
			 * as other interrupts, but need to study CPEI behaviour with
			 * polling before making changes.
			 */
			if (data && data->chip) {
				data->chip->irq_disable(data);
				data->chip->irq_set_affinity(data, mask, false);
				data->chip->irq_enable(data);
				printk ("Re-targeting CPEI to cpu %d\n", new_cpei_cpu);
			}
		}
		if (!data) {
			printk ("Unable to retarget CPEI, offline cpu [%d] failed\n", cpu);
			retval = -EBUSY;
		}
	}
	return retval;
}