From 1d462599bee9a2f5f3988aafa43feda602d5e188 Mon Sep 17 00:00:00 2001 From: Dietmar Eggemann Date: Thu, 16 Jan 2014 19:44:10 +0000 Subject: HMP: Restrict irq_default_affinity to hmp_slow_cpu_mask This patch limits the default affinity mask for all irqs to the cluster of the little cpus. This patch has the positive side effect that an irq thread which has its IRQTF_RUNTHREAD set inside irq_thread() -> irq_wait_for_interrupt() will not overwrite its struct task_struct->cpus_allowed with a full cpu mask of desc->irq_data.affinity in irq_thread_check_affinity() essentially reverting patch "HMP: experimental: Force all rt tasks to start on little domain." for this irq thread. Signed-off-by: Dietmar Eggemann Signed-off-by: Jon Medhurst --- kernel/irq/irqdesc.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index 473b2b6eccb..20ecfb0984e 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -36,11 +36,19 @@ static int __init irq_affinity_setup(char *str) } __setup("irqaffinity=", irq_affinity_setup); +extern struct cpumask hmp_slow_cpu_mask; + static void __init init_irq_default_affinity(void) { #ifdef CONFIG_CPUMASK_OFFSTACK if (!irq_default_affinity) zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT); +#endif +#ifdef CONFIG_SCHED_HMP + if (!cpumask_empty(&hmp_slow_cpu_mask)) { + cpumask_copy(irq_default_affinity, &hmp_slow_cpu_mask); + return; + } #endif if (cpumask_empty(irq_default_affinity)) cpumask_setall(irq_default_affinity); -- cgit v1.2.3