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

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Date:   Wed, 21 Apr 2021 16:01:39 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Valentin Schneider <valentin.schneider@....com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Vincent Donnefort <vincent.donnefort@....com>,
        Paul Turner <pjt@...gle.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] sched/fair: Fix an unused function warning

From: Arnd Bergmann <arnd@...db.de>

Without CONFIG_NO_HZ_COMMON, there is now a warning about update_nohz_stats
after the last caller outside the #ifdef was removed

kernel/sched/fair.c:8433:13: error: 'update_nohz_stats' defined but not used [-Werror=unused-function]
 8433 | static bool update_nohz_stats(struct rq *rq)

Simplify the function by removing the #ifdef inside it and move it into
the block in which it gets called.

Fixes: 0826530de3cb ("sched/fair: Remove update of blocked load from newidle_balance")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 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 df2083d2dd0c..7c3edbb5ec70 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -8430,28 +8430,6 @@ 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.
@@ -10123,6 +10101,24 @@ static inline int on_null_domain(struct rq *rq)
 }
 
 #ifdef CONFIG_NO_HZ_COMMON
+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;
+}
+
 /*
  * idle load balancing details
  * - When one of the busy CPUs notice that there may be an idle rebalancing
-- 
2.29.2