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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2005-11-02 22:24:33 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-11-02 22:24:33 +0000
commita054a811597a17ffbe92bc4db04a4dc2f1b1ea55 (patch)
treeb600081d964d6fe7cc1cfe2669a739da0e1743f4 /arch/arm/kernel/irq.c
parent273c2cdb2b6d6743d85ddbde82e71f8adbf5bf10 (diff)
[ARM SMP] Add hotplug CPU infrastructure
This patch adds the infrastructure to support hotplug CPU on ARM platforms. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/irq.c')
-rw-r--r--arch/arm/kernel/irq.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 3284118f356..9def4404e1f 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 */