Re: [PATCH] sched_ext: Refresh idle state when kicking CPUs

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

Hi Andrea,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/sched/core]
[also build test ERROR on linus/master v6.13-rc6 next-20250107]
[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/Andrea-Righi/sched_ext-Refresh-idle-state-when-kicking-CPUs/20250102-022650
base:   tip/sched/core
patch link:    https://lore.kernel.org/r/20250101182449.21517-1-arighi%40nvidia.com
patch subject: [PATCH] sched_ext: Refresh idle state when kicking CPUs
config: x86_64-buildonly-randconfig-005-20250108 (https://download.01.org/0day-ci/archive/20250108/202501080743.HLPZzVsv-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250108/202501080743.HLPZzVsv-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/202501080743.HLPZzVsv-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from kernel/sched/build_policy.c:63:
   kernel/sched/ext.c: In function 'refresh_idle_state_on_kick':
>> kernel/sched/ext.c:6031:17: error: implicit declaration of function '__scx_update_idle'; did you mean 'scx_update_idle'? [-Werror=implicit-function-declaration]
    6031 |                 __scx_update_idle(rq, true);
         |                 ^~~~~~~~~~~~~~~~~
         |                 scx_update_idle
   cc1: some warnings being treated as errors


vim +6031 kernel/sched/ext.c

  6020	
  6021	static void refresh_idle_state_on_kick(struct rq *rq)
  6022	{
  6023		lockdep_assert_rq_held(rq);
  6024	
  6025		/*
  6026		 * If the CPU is idle and the local DSQ has no queued tasks, update
  6027		 * its idle state to prevent the CPU from staying busy even if it
  6028		 * returns back to idle without executing any task.
  6029		 */
  6030		if (is_idle_task(rq->curr) && !rq->scx.local_dsq.nr)
> 6031			__scx_update_idle(rq, true);
  6032	}
  6033	

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