[openeuler:openEuler-1.0-LTS 1666/1666] kernel/sched/core.c:5976:22: error: 'root_task_group' undeclared; did you mean 'task_group'?

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

Hi Hui,

FYI, the error/warning still remains.

tree:   https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head:   4f84adc737008927c799b691e7b051bea90313cf
commit: 713cfd2684fa5ea08b144d92b9858b932c0f1705 [1666/1666] sched: Introduce smart grid scheduling strategy for cfs
config: arm64-randconfig-004-20250618 (https://download.01.org/0day-ci/archive/20250618/202506182031.ldH7VynO-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250618/202506182031.ldH7VynO-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/202506182031.ldH7VynO-lkp@intel.com/

All errors (new ones prefixed by >>):

   kernel/sched/core.c:1587:6: warning: no previous prototype for 'sched_set_stop_task' [-Wmissing-prototypes]
    void sched_set_stop_task(int cpu, struct task_struct *stop)
         ^~~~~~~~~~~~~~~~~~~
   kernel/sched/core.c:3771:35: warning: no previous prototype for 'preempt_schedule_irq' [-Wmissing-prototypes]
    asmlinkage __visible void __sched preempt_schedule_irq(void)
                                      ^~~~~~~~~~~~~~~~~~~~
   kernel/sched/core.c: In function 'sched_cpu_activate':
   kernel/sched/core.c:5845:2: error: implicit declaration of function 'tg_update_affinity_domains'; did you mean 'irq_create_affinity_masks'? [-Werror=implicit-function-declaration]
     tg_update_affinity_domains(cpu, 1);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~
     irq_create_affinity_masks
   kernel/sched/core.c: In function 'sched_init_smp':
   kernel/sched/core.c:5976:2: error: implicit declaration of function 'init_auto_affinity'; did you mean 'irq_set_affinity'? [-Werror=implicit-function-declaration]
     init_auto_affinity(&root_task_group);
     ^~~~~~~~~~~~~~~~~~
     irq_set_affinity
>> kernel/sched/core.c:5976:22: error: 'root_task_group' undeclared (first use in this function); did you mean 'task_group'?
     init_auto_affinity(&root_task_group);
                         ^~~~~~~~~~~~~~~
                         task_group
   kernel/sched/core.c:5976:22: note: each undeclared identifier is reported only once for each function it appears in
   kernel/sched/core.c: In function 'sched_init':
   kernel/sched/core.c:6029:32: warning: variable 'ptr' set but not used [-Wunused-but-set-variable]
     unsigned long alloc_size = 0, ptr;
                                   ^~~
   cc1: some warnings being treated as errors


vim +5976 kernel/sched/core.c

  5949	
  5950	void __init sched_init_smp(void)
  5951	{
  5952		sched_init_numa();
  5953	
  5954		/*
  5955		 * There's no userspace yet to cause hotplug operations; hence all the
  5956		 * CPU masks are stable and all blatant races in the below code cannot
  5957		 * happen. The hotplug lock is nevertheless taken to satisfy lockdep,
  5958		 * but there won't be any contention on it.
  5959		 */
  5960		cpus_read_lock();
  5961		mutex_lock(&sched_domains_mutex);
  5962		sched_init_domains(cpu_active_mask);
  5963		mutex_unlock(&sched_domains_mutex);
  5964		cpus_read_unlock();
  5965	
  5966		/* Move init over to a non-isolated CPU */
  5967		if (set_cpus_allowed_ptr(current, housekeeping_cpumask(HK_FLAG_DOMAIN)) < 0)
  5968			BUG();
  5969		sched_init_granularity();
  5970	
  5971		init_sched_rt_class();
  5972		init_sched_dl_class();
  5973	
  5974		sched_smp_initialized = true;
  5975	
> 5976		init_auto_affinity(&root_task_group);
  5977	}
  5978	

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