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authorDietmar Eggemann <dietmar.eggemann@arm.com>2014-01-16 19:44:10 +0000
committerJon Medhurst <tixy@linaro.org>2014-01-22 09:50:45 +0000
commit1d462599bee9a2f5f3988aafa43feda602d5e188 (patch)
tree865e7bce80b902347b4472932d53cc21aa4245cb
parentb2fafaba35f490947b78e8d0d4f4264a137e64cd (diff)
downloadlinaro-lsk-1d462599bee9a2f5f3988aafa43feda602d5e188.tar.gz
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 <dietmar.eggemann@arm.com> Signed-off-by: Jon Medhurst <tixy@linaro.org>
-rw-r--r--kernel/irq/irqdesc.c8
1 files changed, 8 insertions, 0 deletions
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
@@ -36,12 +36,20 @@ 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);
}