void do_cpu_irq_mask()

in kernel/irq.c [509:563]

• 45 lines of code
• 5 McCabe index (conditional complexity)

void do_cpu_irq_mask(struct pt_regs *regs)
{
	struct pt_regs *old_regs;
	unsigned long eirr_val;
	int irq, cpu = smp_processor_id();
	struct irq_data *irq_data;
#ifdef CONFIG_SMP
	cpumask_t dest;
#endif

	old_regs = set_irq_regs(regs);
	local_irq_disable();
	irq_enter();

	eirr_val = mfctl(23) & cpu_eiem & per_cpu(local_ack_eiem, cpu);
	if (!eirr_val)
		goto set_out;
	irq = eirr_to_irq(eirr_val);

	irq_data = irq_get_irq_data(irq);

	/* Filter out spurious interrupts, mostly from serial port at bootup */
	if (unlikely(!irq_desc_has_action(irq_data_to_desc(irq_data))))
		goto set_out;

#ifdef CONFIG_SMP
	cpumask_copy(&dest, irq_data_get_affinity_mask(irq_data));
	if (irqd_is_per_cpu(irq_data) &&
	    !cpumask_test_cpu(smp_processor_id(), &dest)) {
		int cpu = cpumask_first(&dest);

		printk(KERN_DEBUG "redirecting irq %d from CPU %d to %d\n",
		       irq, smp_processor_id(), cpu);
		gsc_writel(irq + CPU_IRQ_BASE,
			   per_cpu(cpu_data, cpu).hpa);
		goto set_out;
	}
#endif
	stack_overflow_check(regs);

#ifdef CONFIG_IRQSTACKS
	execute_on_irq_stack(&generic_handle_irq, irq);
#else
	generic_handle_irq(irq);
#endif /* CONFIG_IRQSTACKS */

 out:
	irq_exit();
	set_irq_regs(old_regs);
	return;

 set_out:
	set_eiem(cpu_eiem & per_cpu(local_ack_eiem, cpu));
	goto out;
}