[anolis-intel-cloud:devel-6.6 50/50] kernel/sched/fair.c:4146:6: warning: no previous prototype for 'set_group_prefer_node'

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

tree:   https://gitee.com/anolis/intel-cloud-kernel.git devel-6.6
head:   7c285f40a964b427534f3dab33b104ee9cab6245
commit: a0afbf3c5d0386fa940ad3ee5e5cda8ad0e3eced [50/50] anolis: sched: add Numa Affine feature
config: x86_64-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20251214/202512140342.7G3GhhrT-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/20251214/202512140342.7G3GhhrT-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/202512140342.7G3GhhrT-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/sched/fair.c:4146:6: warning: no previous prototype for 'set_group_prefer_node' [-Wmissing-prototypes]
    4146 | void set_group_prefer_node(struct task_group *tg)
         |      ^~~~~~~~~~~~~~~~~~~~~


vim +/set_group_prefer_node +4146 kernel/sched/fair.c

  4137	
  4138	static inline u64 cfs_rq_last_update_time(struct cfs_rq *cfs_rq)
  4139	{
  4140		return u64_u32_load_copy(cfs_rq->avg.last_update_time,
  4141					 cfs_rq->last_update_time_copy);
  4142	}
  4143	#ifdef CONFIG_FAIR_GROUP_SCHED
  4144	DEFINE_PER_CPU(struct cpumask, cpus_allowed_alt);
  4145	/* Decide which node for @tg to run on*/
> 4146	void set_group_prefer_node(struct task_group *tg)
  4147	{
  4148		int cpu, node;
  4149		unsigned long min_load = ULONG_MAX, now = jiffies, load;
  4150		static int prev_node;
  4151		static unsigned long prev_jiffies;
  4152	
  4153		/* Choose Round-Robin way with frequent call */
  4154		if (now - prev_jiffies < HZ) {
  4155			prev_jiffies = now;
  4156	
  4157			prev_node = next_online_node(prev_node);
  4158			if (prev_node >= 0 && prev_node < MAX_NUMNODES) {
  4159				tg->prefer_node = prev_node;
  4160				return;
  4161			}
  4162	
  4163			prev_node = first_online_node;
  4164			tg->prefer_node = prev_node;
  4165			return;
  4166		}
  4167	
  4168		prev_jiffies = now;
  4169	
  4170		/* find the idlest node */
  4171		prev_node = first_online_node;
  4172		for_each_online_node(node) {
  4173			load = ULONG_MAX;
  4174			for_each_cpu(cpu, cpumask_of_node(node))
  4175				load += cpu_load(cpu_rq(cpu));
  4176			if (load < min_load) {
  4177				min_load = load;
  4178				prev_node = node;
  4179			}
  4180		}
  4181	
  4182		tg->prefer_node = prev_node;
  4183	}
  4184	

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