linux-kernel - [PATCH] sched/uclamp: Fix unnused variable warning

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Message-ID: <b2ad1f31-21b9-42a5-a735-b9496470348a@arm.com>
Date: Tue, 8 Oct 2024 09:23:18 +0100
From: Christian Loehle <christian.loehle@....com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>,
 Vincent Guittot <vincent.guittot@...aro.org>,
 Valentin Schneider <vschneid@...hat.com>, Juri Lelli
 <juri.lelli@...hat.com>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 Ingo Molnar <mingo@...hat.com>
Subject: [PATCH] sched/uclamp: Fix unnused variable warning

uclamp_mutex is only used for CONFIG_SYSCTL or
CONFIG_UCLAMP_TASK_GROUP so ifdef that to fix the compile-time warning.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202410060258.bPl2ZoUo-lkp@intel.com/
Signed-off-by: Christian Loehle <christian.loehle@....com>
---
 kernel/sched/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 43e453ab7e20..18d9622eac8d 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1394,7 +1394,9 @@ void set_load_weight(struct task_struct *p, bool update_load)
  * requests are serialized using a mutex to reduce the risk of conflicting
  * updates or API abuses.
  */
+#if defined(CONFIG_UCLAMP_TASK_GROUP) || defined(CONFIG_SYSCTL)
 static DEFINE_MUTEX(uclamp_mutex);
+#endif
 
 /* Max allowed minimum utilization */
 static unsigned int __maybe_unused sysctl_sched_uclamp_util_min = SCHED_CAPACITY_SCALE;
-- 
2.34.1