irqchip/bcm-7038-l1: Report that effective affinity is a single target

The BCM 7038-L1 driver only targets a single CPU at a time, even if
the notional affinity is wider. Let's inform the core code
about this.

Signed-off-by: Marc Zyngier <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Cc: Andrew Lunn <[e-mail]>
Cc: James Hogan <[e-mail]>
Cc: Jason Cooper <[e-mail]>
Cc: Paul Burton <[e-mail]>
Cc: Chris Zankel <[e-mail]>
Cc: Kevin Cernekee <[e-mail]>
Cc: Wei Xu <[e-mail]>
Cc: Max Filippov <[e-mail]>
Cc: Florian Fainelli <[e-mail]>
Cc: Gregory Clement <[e-mail]>
Cc: Matt Redfearn <[e-mail]>
Cc: Sebastian Hesselbarth <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]

drivers/irqchip/Kconfig

···
 	bool
 	select GENERIC_IRQ_CHIP
 	select IRQ_DOMAIN
+	select GENERIC_IRQ_EFFECTIVE_AFF_MASK
 
 config BCM7120_L2_IRQ
 	bool

drivers/irqchip/irq-bcm7038-l1.c

···
 		__bcm7038_l1_unmask(d, first_cpu);
 
 	raw_spin_unlock_irqrestore(&intc->lock, flags);
+	irq_data_update_effective_affinity(d, cpumask_of(first_cpu));
+
 	return 0;
 }
 
···
 {
 	irq_set_chip_and_handler(virq, &bcm7038_l1_irq_chip, handle_level_irq);
 	irq_set_chip_data(virq, d->host_data);
+	irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq)));
 	return 0;
 }