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

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Message-ID: <087769c7-f8e7-4701-b6f1-4585570b8be8@arm.com>
Date: Fri, 25 Oct 2024 11:01:08 +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>, Sebastian Siewior <bigeasy@...utronix.de>,
 Thomas Gleixner <tglx@...utronix.de>, oe-kbuild-all@...ts.linux.dev,
 kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] sched/uclamp: Fix unnused variable warning

On 10/8/24 09:23, Christian Loehle wrote:
> 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;

Gentle ping and adding CCs