[peterz-queue:sched/flat 61/61] kernel/sched/fair.c:9922:20: warning: 'cfs_rq' is used uninitialized

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/flat
head:   a5d37500c54a90dc76e3e3e1cd3b0194b06d5461
commit: a5d37500c54a90dc76e3e3e1cd3b0194b06d5461 [61/61] sched/eevdf: Move to a single runqueue
config: x86_64-rhel-9.4 (https://download.01.org/0day-ci/archive/20260602/202606022233.nMLuVHVG-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260602/202606022233.nMLuVHVG-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/202606022233.nMLuVHVG-lkp@intel.com/

All warnings (new ones prefixed by >>):

   kernel/sched/fair.c: In function 'pick_task_fair':
>> kernel/sched/fair.c:9922:20: warning: 'cfs_rq' is used uninitialized [-Wuninitialized]
    9922 |         if (!cfs_rq->h_nr_queued)
         |              ~~~~~~^~~~~~~~~~~~~
   kernel/sched/fair.c:9917:24: note: 'cfs_rq' was declared here
    9917 |         struct cfs_rq *cfs_rq;
         |                        ^~~~~~


vim +/cfs_rq +9922 kernel/sched/fair.c

  9912	
  9913	struct task_struct *pick_task_fair(struct rq *rq, struct rq_flags *rf)
  9914		__must_hold(__rq_lockp(rq))
  9915	{
  9916		struct sched_entity *se;
  9917		struct cfs_rq *cfs_rq;
  9918		struct task_struct *p;
  9919		int new_tasks;
  9920	
  9921	again:
> 9922		if (!cfs_rq->h_nr_queued)
  9923			goto idle;
  9924	
  9925		/* Might not have done put_prev_entity() */
  9926		if (cfs_rq->curr && cfs_rq->curr->on_rq)
  9927			update_curr(cfs_rq);
  9928	
  9929		se = pick_next_entity(rq, true);
  9930		if (!se)
  9931			goto again;
  9932	
  9933		p = task_of(se);
  9934		return p;
  9935	
  9936	idle:
  9937		new_tasks = sched_balance_newidle(rq, rf);
  9938		if (new_tasks < 0)
  9939			return RETRY_TASK;
  9940		if (new_tasks > 0)
  9941			goto again;
  9942		return NULL;
  9943	}
  9944	

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