From: Mike Galbraith <mgalbraith@suse.de>
Date: Wed Aug  2 10:55:41 CEST 2017
Subject: NOHZ_FULL: non isolated cpus are housekeepers
Patch-mainline: Never, RT specific
References: SLE Realtime Extension

Signed-off-by: Mike Galbraith <mgalbraith@suse.de>
---
 include/linux/tick.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/tick.h
+++ b/include/linux/tick.h
@@ -272,7 +272,7 @@ static inline const struct cpumask *hous
 static inline bool is_housekeeping_cpu(int cpu)
 {
 #ifdef CONFIG_NO_HZ_FULL
-	if (tick_nohz_full_enabled())
+	if (tick_nohz_full_enabled() && runqueue_is_isolated(cpu))
 		return cpumask_test_cpu(cpu, housekeeping_mask);
 #endif
 	return true;