Merge "softirq: defer softirq processing to ksoftirqd if CPU is busy with RT"

1 files changed, 11 insertions, 0 deletions

diff --git a/kernel/sched/cpupri.c b/kernel/sched/cpupri.c
index 1d00cf8c00fa..14225d5d8617 100644
--- a/kernel/sched/cpupri.c
+++ b/kernel/sched/cpupri.c
@@ -279,3 +279,14 @@ void cpupri_cleanup(struct cpupri *cp)
 	for (i = 0; i < CPUPRI_NR_PRIORITIES; i++)
 		free_cpumask_var(cp->pri_to_cpu[i].mask);
 }
+
+/*
+ * cpupri_check_rt - check if CPU has a RT task
+ * should be called from rcu-sched read section.
+ */
+bool cpupri_check_rt(void)
+{
+	int cpu = raw_smp_processor_id();
+
+	return cpu_rq(cpu)->rd->cpupri.cpu_to_pri[cpu] > CPUPRI_NORMAL;
+}