diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2012-05-25 16:59:47 +0200 |
|---|---|---|
| committer | Jon Medhurst <tixy@linaro.org> | 2014-01-22 09:50:41 +0000 |
| commit | 6bfbe7d9f891dc145ed395cf2b8c23b2dd9c74e8 (patch) | |
| tree | 97cb2bb7f7296719bdefe9ff092c4b75148d8975 /kernel | |
| parent | edecdef95ad50910270915aa0cdcf2f624301cac (diff) | |
genirq: Add default affinity mask command line option
If we isolate CPUs, then we don't want random device interrupts on
them. Even w/o the user space irq balancer enabled we can end up with
irqs on non boot cpus.
Allow to restrict the default irq affinity mask.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jon Medhurst <tixy@linaro.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/irq/irqdesc.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index 192a302d6cf..473b2b6eccb 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -23,10 +23,27 @@ static struct lock_class_key irq_desc_lock_class; #if defined(CONFIG_SMP) +static int __init irq_affinity_setup(char *str) +{ + zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT); + cpulist_parse(str, irq_default_affinity); + /* + * Set at least the boot cpu. We don't want to end up with + * bugreports caused by random comandline masks + */ + cpumask_set_cpu(smp_processor_id(), irq_default_affinity); + return 1; +} +__setup("irqaffinity=", irq_affinity_setup); + static void __init init_irq_default_affinity(void) { - alloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT); - cpumask_setall(irq_default_affinity); +#ifdef CONFIG_CPUMASK_OFFSTACK + if (!irq_default_affinity) + zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT); +#endif + if (cpumask_empty(irq_default_affinity)) + cpumask_setall(irq_default_affinity); } #else static void __init init_irq_default_affinity(void) |