[PATCH 4.9 34/78] irqchip/bcm7038-l1: Hide cpu offline callback when building for !SMP

From: Greg Kroah-Hartman
Date: Thu Sep 13 2018 - 09:39:35 EST


4.9-stable review patch. If anyone has any objections, please let me know.

------------------

From: Jonas Gorski <jonas.gorski@xxxxxxxxx>

[ Upstream commit 0702bc4d2fe793018ad9aa0eb14bff7f526c4095 ]

When compiling bmips with SMP disabled, the build fails with:

drivers/irqchip/irq-bcm7038-l1.o: In function `bcm7038_l1_cpu_offline':
drivers/irqchip/irq-bcm7038-l1.c:242: undefined reference to `irq_set_affinity_locked'
make[5]: *** [vmlinux] Error 1

Fix this by adding and setting bcm7038_l1_cpu_offline only when actually
compiling for SMP. It wouldn't have been used anyway, as it requires
CPU_HOTPLUG, which in turn requires SMP.

Fixes: 34c535793bcb ("irqchip/bcm7038-l1: Implement irq_cpu_offline() callback")
Signed-off-by: Jonas Gorski <jonas.gorski@xxxxxxxxx>
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/irqchip/irq-bcm7038-l1.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/drivers/irqchip/irq-bcm7038-l1.c
+++ b/drivers/irqchip/irq-bcm7038-l1.c
@@ -215,6 +215,7 @@ static int bcm7038_l1_set_affinity(struc
return 0;
}

+#ifdef CONFIG_SMP
static void bcm7038_l1_cpu_offline(struct irq_data *d)
{
struct cpumask *mask = irq_data_get_affinity_mask(d);
@@ -239,6 +240,7 @@ static void bcm7038_l1_cpu_offline(struc
}
irq_set_affinity_locked(d, &new_affinity, false);
}
+#endif

static int __init bcm7038_l1_init_one(struct device_node *dn,
unsigned int idx,
@@ -291,7 +293,9 @@ static struct irq_chip bcm7038_l1_irq_ch
.irq_mask = bcm7038_l1_mask,
.irq_unmask = bcm7038_l1_unmask,
.irq_set_affinity = bcm7038_l1_set_affinity,
+#ifdef CONFIG_SMP
.irq_cpu_offline = bcm7038_l1_cpu_offline,
+#endif
};

static int bcm7038_l1_map(struct irq_domain *d, unsigned int virq,