[openeuler:OLK-6.6 2339/2339] kernel/sched/core.c:158:5: warning: no previous prototype for function 'sched_task_is_throttled'

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

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   f528a77f54d3c07d0b7feb879d2ba15275a4b3ff
commit: b1415ae822e0f2c88266c3f6f8e2b962baa9a579 [2339/2339] interference: Exclude throttle time from rundelay
config: x86_64-buildonly-randconfig-005-20250530 (https://download.01.org/0day-ci/archive/20250530/202505301346.VRD8YS7H-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/20250530/202505301346.VRD8YS7H-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/202505301346.VRD8YS7H-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/sched/core.c:158:5: warning: no previous prototype for function 'sched_task_is_throttled' [-Wmissing-prototypes]
     158 | int sched_task_is_throttled(struct task_struct *p, int cpu)
         |     ^
   kernel/sched/core.c:158:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     158 | int sched_task_is_throttled(struct task_struct *p, int cpu)
         | ^
         | static 
   kernel/sched/core.c:6465:1: warning: unused function 'class_core_lock_lock_ptr' [-Wunused-function]
    6465 | DEFINE_LOCK_GUARD_1(core_lock, int,
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    6466 |                     sched_core_lock(*_T->lock, &_T->flags),
         |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    6467 |                     sched_core_unlock(*_T->lock, &_T->flags),
         |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    6468 |                     unsigned long flags)
         |                     ~~~~~~~~~~~~~~~~~~~~
   include/linux/cleanup.h:229:49: note: expanded from macro 'DEFINE_LOCK_GUARD_1'
     229 | __DEFINE_CLASS_IS_CONDITIONAL(_name, false);                            \
         |                                                                         ^
     230 | __DEFINE_UNLOCK_GUARD(_name, _type, _unlock, __VA_ARGS__)               \
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/cleanup.h:205:21: note: expanded from macro '\
   __DEFINE_UNLOCK_GUARD'
     205 | static inline void *class_##_name##_lock_ptr(class_##_name##_t *_T)     \
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~
   <scratch space>:236:1: note: expanded from here
     236 | class_core_lock_lock_ptr
         | ^~~~~~~~~~~~~~~~~~~~~~~~
   2 warnings generated.


vim +/sched_task_is_throttled +158 kernel/sched/core.c

   156	
   157	#if defined(CONFIG_SCHED_CORE) || defined(CONFIG_CGROUP_IFS)
 > 158	int sched_task_is_throttled(struct task_struct *p, int cpu)
   159	{
   160		if (p->sched_class->task_is_throttled)
   161			return p->sched_class->task_is_throttled(p, cpu);
   162	
   163		return 0;
   164	}
   165	#endif
   166	

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