linux-kernel - Re: [PATCH V4 3/6] Sched: Tunable to specify duration of time slice extension

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Message-ID: <202505142126.0irJYJgE-lkp@intel.com>
Date: Wed, 14 May 2025 19:21:33 +0800
From: kernel test robot <lkp@...el.com>
To: Prakash Sangappa <prakash.sangappa@...cle.com>,
	linux-kernel@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, rostedt@...dmis.org,
	mathieu.desnoyers@...icios.com, tglx@...utronix.de,
	bigeasy@...utronix.de, kprateek.nayak@....com
Subject: Re: [PATCH V4 3/6] Sched: Tunable to specify duration of time slice
 extension

Hi Prakash,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/sched/core]
[also build test WARNING on peterz-queue/sched/core linus/master v6.15-rc6]
[cannot apply to tip/core/entry next-20250513]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Prakash-Sangappa/Sched-Scheduler-time-slice-extension/20250514-054844
base:   tip/sched/core
patch link:    https://lore.kernel.org/r/20250513214554.4160454-4-prakash.sangappa%40oracle.com
patch subject: [PATCH V4 3/6] Sched: Tunable to specify duration of time slice extension
config: arm-randconfig-003-20250514 (https://download.01.org/0day-ci/archive/20250514/202505142126.0irJYJgE-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250514/202505142126.0irJYJgE-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505142126.0irJYJgE-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/sched/core.c:4682:12: warning: 'sysctl_sched_preempt_delay' defined but not used [-Wunused-function]
    static int sysctl_sched_preempt_delay(const struct ctl_table *table, int write,
               ^~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/sysctl_sched_preempt_delay +4682 kernel/sched/core.c

  4681	
> 4682	static int sysctl_sched_preempt_delay(const struct ctl_table *table, int write,
  4683			void *buffer, size_t *lenp, loff_t *ppos)
  4684	{
  4685		int err;
  4686	
  4687		err = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
  4688		if (err < 0)
  4689			return err;
  4690		if (sysctl_sched_preempt_delay_us > SCHED_PREEMPT_DELAY_DEFAULT_US)
  4691			pr_warn("Sched preemption delay time set higher then default value %d us\n",
  4692				SCHED_PREEMPT_DELAY_DEFAULT_US);
  4693		return err;
  4694	}
  4695	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki