linux-kernel - [tip: sched/core] sched/fair: Define sched_idle

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Date:   Mon, 20 Jan 2020 07:08:19 -0000
From:   "tip-bot2 for Viresh Kumar" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Ingo Molnar <mingo@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: sched/core] sched/fair: Define sched_idle_cpu() only for SMP
 configurations

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     afa70d941f663c69c9a64ec1021bbcfa82f0e54a
Gitweb:        https://git.kernel.org/tip/afa70d941f663c69c9a64ec1021bbcfa82f0e54a
Author:        Viresh Kumar <viresh.kumar@...aro.org>
AuthorDate:    Mon, 20 Jan 2020 11:29:05 +05:30
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Mon, 20 Jan 2020 08:03:39 +01:00

sched/fair: Define sched_idle_cpu() only for SMP configurations

sched_idle_cpu() isn't used for non SMP configuration and with a recent
change, we have started getting following warning:

  kernel/sched/fair.c:5221:12: warning: ‘sched_idle_cpu’ defined but not used [-Wunused-function]

Fix that by defining sched_idle_cpu() only for SMP configurations.

Fixes: 323af6deaf70 ("sched/fair: Load balance aggressively for SCHED_IDLE CPUs")
Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Juri Lelli <juri.lelli@...hat.com>
Cc: Vincent Guittot <vincent.guittot@...aro.org>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>
Link: https://lore.kernel.org/r/f0554f590687478b33914a4aff9f0e6a62886d44.1579499907.git.viresh.kumar@linaro.org
---
 kernel/sched/fair.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index ebf5095..fe4e0d7 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5218,10 +5218,12 @@ static int sched_idle_rq(struct rq *rq)
 			rq->nr_running);
 }
 
+#ifdef CONFIG_SMP
 static int sched_idle_cpu(int cpu)
 {
 	return sched_idle_rq(cpu_rq(cpu));
 }
+#endif
 
 /*
  * The enqueue_task method is called before nr_running is