1 files changed, 31 insertions, 0 deletions

diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 3284118f356b..9def4404e1f2 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -1050,3 +1050,34 @@ static int __init noirqdebug_setup(char *str)
 }
 
 __setup("noirqdebug", noirqdebug_setup);
+
+#ifdef CONFIG_HOTPLUG_CPU
+/*
+ * The CPU has been marked offline.  Migrate IRQs off this CPU.  If
+ * the affinity settings do not allow other CPUs, force them onto any
+ * available CPU.
+ */
+void migrate_irqs(void)
+{
+        unsigned int i, cpu = smp_processor_id();
+
+        for (i = 0; i < NR_IRQS; i++) {
+                struct irqdesc *desc = irq_desc + i;
+
+                if (desc->cpu == cpu) {
+                        unsigned int newcpu = any_online_cpu(desc->affinity);
+
+                        if (newcpu == NR_CPUS) {
+                                if (printk_ratelimit())
+                                        printk(KERN_INFO "IRQ%u no longer affine to CPU%u\n",
+                                               i, cpu);
+
+                                cpus_setall(desc->affinity);
+                                newcpu = any_online_cpu(desc->affinity);
+                        }
+
+                        route_irq(desc, i, newcpu);
+                }
+        }
+}
+#endif /* CONFIG_HOTPLUG_CPU */