[v1] sched/uclamp: Fix unnused variable warning

[PATCH] sched/uclamp: Fix unnused variable warning

Posted by Christian Loehle 1 month, 2 weeks ago

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

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

Posted by Peter Zijlstra 1 month ago

On Tue, Oct 08, 2024 at 09:23:18AM +0100, 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@intel.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202410060258.bPl2ZoUo-lkp@intel.com/
> Signed-off-by: Christian Loehle <christian.loehle@arm.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

Bah, too much email :/ But also,

  https://lkml.kernel.org/r/20241025073213.GE36494@noisy.programming.kicks-ass.net

where I said:

"sigh.. I hate our CONFIG space :/

Perhaps add __maybe_unused like the other variables it sits right next
to instead of adding yet more #ifdef crud?"

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

Posted by Christian Loehle 1 month ago

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

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

Posted by Sebastian Siewior 1 month ago

On 2024-10-25 11:01:08 [+0100], Christian Loehle wrote:
> Gentle ping and adding CCs

Thank you.

I poked Christian since the bot send another report
	202410250459.EJe6PJI5-lkp@intel.com

Sebastian