static int __irq_prepare_move()

in kernel/irq_ia64.c [261:283]

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

static int __irq_prepare_move(int irq, int cpu)
{
	struct irq_cfg *cfg = &irq_cfg[irq];
	int vector;
	cpumask_t domain;

	if (cfg->move_in_progress || cfg->move_cleanup_count)
		return -EBUSY;
	if (cfg->vector == IRQ_VECTOR_UNASSIGNED || !cpu_online(cpu))
		return -EINVAL;
	if (cpumask_test_cpu(cpu, &cfg->domain))
		return 0;
	domain = vector_allocation_domain(cpu);
	vector = find_unassigned_vector(domain);
	if (vector < 0)
		return -ENOSPC;
	cfg->move_in_progress = 1;
	cfg->old_domain = cfg->domain;
	cfg->vector = IRQ_VECTOR_UNASSIGNED;
	cfg->domain = CPU_MASK_NONE;
	BUG_ON(__bind_irq_vector(irq, vector, domain));
	return 0;
}