[openeuler:OLK-6.6 2673/2673] kernel/sched/bpf_sched.c:213:17: warning: no previous prototype for function 'bpf_sched_set_task_prefer_nid'

[openeuler:OLK-6.6 2673/2673] kernel/sched/bpf_sched.c:213:17: warning: no previous prototype for function 'bpf_sched_set_task_prefer_nid'

[kernel test robot]

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   aa3c277f9483def562baa4e43778762d2a8141c2
commit: 4e47cb331dc0bc7e1e2161f946842f9df3f3f44f [2673/2673] sched/ebpf: Add kfunc to set the preferred NUMA node for the task
config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20250813/202508130030.33T0AvPU-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250813/202508130030.33T0AvPU-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/202508130030.33T0AvPU-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from kernel/sched/build_utility.c:73:
   kernel/sched/debug.c:102:12: warning: no previous prototype for function 'is_prefer_numa' [-Wmissing-prototypes]
     102 | int __weak is_prefer_numa(void)
         |            ^
   kernel/sched/debug.c:102:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     102 | int __weak is_prefer_numa(void)
         | ^
         | static 
   In file included from kernel/sched/build_utility.c:113:
   kernel/sched/bpf_sched.c:186:17: warning: no previous prototype for function 'bpf_sched_entity_is_task' [-Wmissing-prototypes]
     186 | __bpf_kfunc int bpf_sched_entity_is_task(struct sched_entity *se)
         |                 ^
   kernel/sched/bpf_sched.c:186:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
     186 | __bpf_kfunc int bpf_sched_entity_is_task(struct sched_entity *se)
         |             ^
         |             static 
   kernel/sched/bpf_sched.c:194:33: warning: no previous prototype for function 'bpf_sched_entity_to_task' [-Wmissing-prototypes]
     194 | __bpf_kfunc struct task_struct *bpf_sched_entity_to_task(struct sched_entity *se)
         |                                 ^
   kernel/sched/bpf_sched.c:194:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
     194 | __bpf_kfunc struct task_struct *bpf_sched_entity_to_task(struct sched_entity *se)
         |             ^
         |             static 
   kernel/sched/bpf_sched.c:202:18: warning: no previous prototype for function 'bpf_sched_tag_of_entity' [-Wmissing-prototypes]
     202 | __bpf_kfunc long bpf_sched_tag_of_entity(struct sched_entity *se)
         |                  ^
   kernel/sched/bpf_sched.c:202:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
     202 | __bpf_kfunc long bpf_sched_tag_of_entity(struct sched_entity *se)
         |             ^
         |             static 
>> kernel/sched/bpf_sched.c:213:17: warning: no previous prototype for function 'bpf_sched_set_task_prefer_nid' [-Wmissing-prototypes]
     213 | __bpf_kfunc int bpf_sched_set_task_prefer_nid(struct task_struct *task, int nid)
         |                 ^
   kernel/sched/bpf_sched.c:213:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
     213 | __bpf_kfunc int bpf_sched_set_task_prefer_nid(struct task_struct *task, int nid)
         |             ^
         |             static 
   5 warnings generated.


vim +/bpf_sched_set_task_prefer_nid +213 kernel/sched/bpf_sched.c

   212	
 > 213	__bpf_kfunc int bpf_sched_set_task_prefer_nid(struct task_struct *task, int nid)
   214	{
   215		if (!task)
   216			return -EINVAL;
   217	
   218		if ((unsigned int)nid >= nr_node_ids)
   219			return -EINVAL;
   220	
   221		return set_prefer_cpus_ptr(task, cpumask_of_node(nid));
   222	}
   223	

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