[openeuler:openEuler-1.0-LTS 1668/1668] kernel/sched/core.c:5976:22: error: use of undeclared identifier 'root_task_group'; 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:   ec206d272f0e39511777d67fe7995c8b6fd1681b
commit: 713cfd2684fa5ea08b144d92b9858b932c0f1705 [1668/1668] sched: Introduce smart grid scheduling strategy for cfs
config: x86_64-buildonly-randconfig-006-20250620 (https://download.01.org/0day-ci/archive/20250724/202507240004.EXSTt6VO-lkp@intel.com/config)
compiler: clang version 20.1.2 (https://github.com/llvm/llvm-project 58df0ef89dd64126512e4ee27b4ac3fd8ddf6247)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250724/202507240004.EXSTt6VO-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/202507240004.EXSTt6VO-lkp@intel.com/

All errors (new ones prefixed by >>):

   kernel/sched/core.c:1587:6: warning: no previous prototype for function 'sched_set_stop_task' [-Wmissing-prototypes]
    1587 | void sched_set_stop_task(int cpu, struct task_struct *stop)
         |      ^
   kernel/sched/core.c:1587:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    1587 | void sched_set_stop_task(int cpu, struct task_struct *stop)
         | ^
         | static 
   kernel/sched/core.c:3771:35: warning: no previous prototype for function 'preempt_schedule_irq' [-Wmissing-prototypes]
    3771 | asmlinkage __visible void __sched preempt_schedule_irq(void)
         |                                   ^
   kernel/sched/core.c:3771:22: note: declare 'static' if the function is not intended to be used outside of this translation unit
    3771 | asmlinkage __visible void __sched preempt_schedule_irq(void)
         |                      ^
         |                      static 
   kernel/sched/core.c:5845:2: error: implicit declaration of function 'tg_update_affinity_domains' [-Werror,-Wimplicit-function-declaration]
    5845 |         tg_update_affinity_domains(cpu, 1);
         |         ^
   kernel/sched/core.c:5904:2: error: implicit declaration of function 'tg_update_affinity_domains' [-Werror,-Wimplicit-function-declaration]
    5904 |         tg_update_affinity_domains(cpu, 0);
         |         ^
   kernel/sched/core.c:5976:2: error: implicit declaration of function 'init_auto_affinity' [-Werror,-Wimplicit-function-declaration]
    5976 |         init_auto_affinity(&root_task_group);
         |         ^
   kernel/sched/core.c:5976:2: note: did you mean 'irq_set_affinity'?
   include/linux/interrupt.h:292:1: note: 'irq_set_affinity' declared here
     292 | irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
         | ^
>> kernel/sched/core.c:5976:22: error: use of undeclared identifier 'root_task_group'; did you mean 'task_group'?
    5976 |         init_auto_affinity(&root_task_group);
         |                             ^~~~~~~~~~~~~~~
         |                             task_group
   kernel/sched/sched.h:1444:34: note: 'task_group' declared here
    1444 | static inline struct task_group *task_group(struct task_struct *p)
         |                                  ^
   kernel/sched/core.c:6029:32: warning: variable 'ptr' set but not used [-Wunused-but-set-variable]
    6029 |         unsigned long alloc_size = 0, ptr;
         |                                       ^
   3 warnings and 4 errors generated.


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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