linux-kernel - [PATCH v2 -next] sched/fair: Fix unused function warning

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Date:   Mon, 29 Mar 2021 22:40:29 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <mingo@...hat.com>, <peterz@...radead.org>,
        <juri.lelli@...hat.com>, <vincent.guittot@...aro.org>,
        <dietmar.eggemann@....com>, <rostedt@...dmis.org>,
        <bsegall@...gle.com>, <mgorman@...e.de>, <bristot@...hat.com>
CC:     <linux-kernel@...r.kernel.org>, YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH v2 -next] sched/fair: Fix unused function warning

while CONFIG_NO_HZ_COMMON is not enabled, gcc warn this:

kernel/sched/fair.c:8398:13: warning: ‘update_nohz_stats’ defined but not used [-Wunused-function]
 static bool update_nohz_stats(struct rq *rq)
             ^~~~~~~~~~~~~~~~~

Move update_nohz_stats() to #ifdef checking this.

Fixes: 0826530de3cb ("sched/fair: Remove update of blocked load from newidle_balance")
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
Reviewed-by: Vincent Guittot <vincent.guittot@...aro.org>
---
v2: Add Fixes tag, also move update_nohz_stats() closer to its only caller _nohz_idle_balance()
---
 kernel/sched/fair.c | 40 ++++++++++++++++++----------------------
 1 file changed, 18 insertions(+), 22 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 6d73bdbb2d40..2a20ada83cbb 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -8395,28 +8395,6 @@ group_type group_classify(unsigned int imbalance_pct,
 	return group_has_spare;
 }
 
-static bool update_nohz_stats(struct rq *rq)
-{
-#ifdef CONFIG_NO_HZ_COMMON
-	unsigned int cpu = rq->cpu;
-
-	if (!rq->has_blocked_load)
-		return false;
-
-	if (!cpumask_test_cpu(cpu, nohz.idle_cpus_mask))
-		return false;
-
-	if (!time_after(jiffies, READ_ONCE(rq->last_blocked_load_update_tick)))
-		return true;
-
-	update_blocked_averages(cpu);
-
-	return rq->has_blocked_load;
-#else
-	return false;
-#endif
-}
-
 /**
  * update_sg_lb_stats - Update sched_group's statistics for load balancing.
  * @env: The load balancing environment.
@@ -10380,6 +10358,24 @@ void nohz_balance_enter_idle(int cpu)
 	WRITE_ONCE(nohz.has_blocked, 1);
 }
 
+static bool update_nohz_stats(struct rq *rq)
+{
+	unsigned int cpu = rq->cpu;
+
+	if (!rq->has_blocked_load)
+		return false;
+
+	if (!cpumask_test_cpu(cpu, nohz.idle_cpus_mask))
+		return false;
+
+	if (!time_after(jiffies, READ_ONCE(rq->last_blocked_load_update_tick)))
+		return true;
+
+	update_blocked_averages(cpu);
+
+	return rq->has_blocked_load;
+}
+
 /*
  * Internal function that runs load balance for all idle cpus. The load balance
  * can be a simple update of blocked load or a complete load balance with
-- 
2.17.1