int irq_select_affinity()

in kernel/irq.c [44:66]

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

int irq_select_affinity(unsigned int irq)
{
	struct irq_data *data = irq_get_irq_data(irq);
	struct irq_chip *chip;
	static int last_cpu;
	int cpu = last_cpu + 1;

	if (!data)
		return 1;
	chip = irq_data_get_irq_chip(data);

	if (!chip->irq_set_affinity || irq_user_affinity[irq])
		return 1;

	while (!cpu_possible(cpu) ||
	       !cpumask_test_cpu(cpu, irq_default_affinity))
		cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0);
	last_cpu = cpu;

	cpumask_copy(irq_data_get_affinity_mask(data), cpumask_of(cpu));
	chip->irq_set_affinity(data, cpumask_of(cpu), false);
	return 0;
}