[PATCH] sched/uclamp: Fix unnused variable warning

[Christian Loehle]

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@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202410060258.bPl2ZoUo-lkp@xxxxxxxxx/
Signed-off-by: Christian Loehle <christian.loehle@xxxxxxx>
---
 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