diff options
| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2005-11-02 23:24:33 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-11-02 23:24:33 +0100 |
| commit | a054a811597a17ffbe92bc4db04a4dc2f1b1ea55 (patch) | |
| tree | b600081d964d6fe7cc1cfe2669a739da0e1743f4 /arch/arm/kernel/irq.c | |
| parent | [ARM SMP] Fix a couple of warnings (diff) | |
| download | linux-a054a811597a17ffbe92bc4db04a4dc2f1b1ea55.tar.xz linux-a054a811597a17ffbe92bc4db04a4dc2f1b1ea55.zip | |
[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.c | 31 |
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 */ |