[jfern:dlserver-feb-fixes 1/9] kernel/sched/fair.c:8535:9: warning: incompatible integer to pointer conversion returning 'int' from a function with result type 'struct task_struct *'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git dlserver-feb-fixes
head:   a81d7e41130fa46e91bde4dd820f673250934286
commit: 60503246d2cf0d7b91d18325cb21c24c13f1d40d [1/9] sched/core: Add clearing of ->dl_server in put_prev_task_balance()
config: powerpc-mpc834x_itxgp_defconfig (https://download.01.org/0day-ci/archive/20240214/202402142202.wl4IpWoW-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project.git f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240214/202402142202.wl4IpWoW-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/202402142202.wl4IpWoW-lkp@intel.com/

All warnings (new ones prefixed by >>):

   kernel/sched/fair.c:8535:9: error: implicit declaration of function 'pick_task_fair' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
           return pick_task_fair(dl_se->rq);
                  ^
>> kernel/sched/fair.c:8535:9: warning: incompatible integer to pointer conversion returning 'int' from a function with result type 'struct task_struct *' [-Wint-conversion]
           return pick_task_fair(dl_se->rq);
                  ^~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/sched/fair.c:13122:6: warning: no previous prototype for function 'free_fair_sched_group' [-Wmissing-prototypes]
   void free_fair_sched_group(struct task_group *tg) { }
        ^
   kernel/sched/fair.c:13122:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void free_fair_sched_group(struct task_group *tg) { }
   ^
   static 
   kernel/sched/fair.c:13124:5: warning: no previous prototype for function 'alloc_fair_sched_group' [-Wmissing-prototypes]
   int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
       ^
   kernel/sched/fair.c:13124:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
   ^
   static 
   kernel/sched/fair.c:13129:6: warning: no previous prototype for function 'online_fair_sched_group' [-Wmissing-prototypes]
   void online_fair_sched_group(struct task_group *tg) { }
        ^
   kernel/sched/fair.c:13129:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void online_fair_sched_group(struct task_group *tg) { }
   ^
   static 
   kernel/sched/fair.c:13131:6: warning: no previous prototype for function 'unregister_fair_sched_group' [-Wmissing-prototypes]
   void unregister_fair_sched_group(struct task_group *tg) { }
        ^
   kernel/sched/fair.c:13131:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void unregister_fair_sched_group(struct task_group *tg) { }
   ^
   static 
   5 warnings and 1 error generated.


vim +8535 kernel/sched/fair.c

  8532	
  8533	static struct task_struct *fair_server_pick_task(struct sched_dl_entity *dl_se)
  8534	{
> 8535		return pick_task_fair(dl_se->rq);
  8536	}
  8537	

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