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>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 2fe6e767b3d6013f3d1023c2e518b0466fa27e2f..a2a5f4111a37e3d41acc529775da4ac0a382f330 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1240,6 +1240,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        See comment before ip2_setup() in
                        drivers/char/ip2/ip2base.c.
 
+       irqaffinity=    [SMP] Set the default irq affinity mask
+                       Format:
+                       <cpu number>,...,<cpu number>
+                       or
+                       <cpu number>-<cpu number>
+                       (must be a positive range in ascending order)
+                       or a mixture
+                       <cpu number>,...,<cpu number>-<cpu number>
+
        irqfixup        [HW]
                        When an interrupt is not handled search all handlers
                        for it. Intended to get systems with badly broken

diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 192a302d6cfd34d23d61294fed068fbc60adc858..473b2b6eccb5e9515840e0b7b4db3d1695f81f6d 100644 (file)
--- 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)