linux-kernel - [PATCH 1/1] sched: apply ifdef CONFIG_SMP to meaningful code only on SMP system

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Message-Id: <1436089411-27244-1-git-send-email-byungchul.park@lge.com>
Date:	Sun,  5 Jul 2015 18:43:31 +0900
From:	byungchul.park@....com
To:	mingo@...nel.org, peterz@...radead.org
Cc:	minchan.kim@....com, linux-kernel@...r.kernel.org,
	Byungchul Park <byungchul.park@....com>
Subject: [PATCH 1/1] sched: apply ifdef CONFIG_SMP to meaningful code only on SMP system

From: Byungchul Park <byungchul.park@....com>

account_numa_dequeue and manipulating se->group_node are meaningful only on SMP

Signed-off-by: Byungchul Park <byungchul.park@....com>
---
 kernel/sched/fair.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 09456fc..93b8de6 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2337,15 +2337,17 @@ account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
 	update_load_sub(&cfs_rq->load, se->load.weight);
 	if (!parent_entity(se))
 		update_load_sub(&rq_of(cfs_rq)->load, se->load.weight);
+#ifdef CONFIG_SMP
 	if (entity_is_task(se)) {
 		account_numa_dequeue(rq_of(cfs_rq), task_of(se));
 		list_del_init(&se->group_node);
 	}
+#endif
 	cfs_rq->nr_running--;
 }
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
-# ifdef CONFIG_SMP
+#ifdef CONFIG_SMP
 static inline long calc_tg_weight(struct task_group *tg, struct cfs_rq *cfs_rq)
 {
 	long tg_weight;
-- 
1.7.9.5

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