Re: [RFC PATCH 1/2] sched: Rate limit migrations to 1 per 2ms per task

[kernel test robot <lkp@intel.com>]

Hi Mathieu,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/sched/core]
[also build test WARNING on linus/master next-20230905]
[cannot apply to v6.5]
[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/Mathieu-Desnoyers/sched-Rate-limit-migrations-to-1-per-2ms-per-task/20230906-030116
base:   tip/sched/core
patch link:    https://lore.kernel.org/r/20230905171105.1005672-2-mathieu.desnoyers%40efficios.com
patch subject: [RFC PATCH 1/2] sched: Rate limit migrations to 1 per 2ms per task
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20230906/202309060412.qsK3hmt5-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230906/202309060412.qsK3hmt5-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309060412.qsK3hmt5-lkp@intel.com/

All warnings (new ones prefixed by >>):

   kernel/sched/fair.c:702:6: warning: no previous prototype for 'update_entity_lag' [-Wmissing-prototypes]
     702 | void update_entity_lag(struct cfs_rq *cfs_rq, struct sched_entity *se)
         |      ^~~~~~~~~~~~~~~~~
   kernel/sched/fair.c:947:5: warning: no previous prototype for 'sched_update_scaling' [-Wmissing-prototypes]
     947 | int sched_update_scaling(void)
         |     ^~~~~~~~~~~~~~~~~~~~
>> kernel/sched/fair.c:962:13: warning: 'should_migrate_task' defined but not used [-Wunused-function]
     962 | static bool should_migrate_task(struct task_struct *p, int prev_cpu)
         |             ^~~~~~~~~~~~~~~~~~~


vim +/should_migrate_task +962 kernel/sched/fair.c

   961	
 > 962	static bool should_migrate_task(struct task_struct *p, int prev_cpu)
   963	{
   964		/* Rate limit task migration. */
   965		if (sched_clock_cpu(prev_cpu) < p->se.next_migration_time)
   966		       return false;
   967		return true;
   968	}
   969	

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