[peterz-queue:sched/core-sched 4/12] kernel/sched/core.c:123:6: warning: no previous prototype for 'sched_core_get'

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core-sched
head:   505afdadb6345844c2db4c74cf2f65504013e8a7
commit: bfc18d532566b96a1c7ac0989d2927f622e7d94c [4/12] sched: Core-wide rq->lock
config: ia64-randconfig-r005-20210126 (attached as .config)
compiler: ia64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?id=bfc18d532566b96a1c7ac0989d2927f622e7d94c
        git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git
        git fetch --no-tags peterz-queue sched/core-sched
        git checkout bfc18d532566b96a1c7ac0989d2927f622e7d94c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> kernel/sched/core.c:123:6: warning: no previous prototype for 'sched_core_get' [-Wmissing-prototypes]
     123 | void sched_core_get(void)
         |      ^~~~~~~~~~~~~~
>> kernel/sched/core.c:131:6: warning: no previous prototype for 'sched_core_put' [-Wmissing-prototypes]
     131 | void sched_core_put(void)
         |      ^~~~~~~~~~~~~~
   kernel/sched/core.c:2899:6: warning: no previous prototype for 'sched_set_stop_task' [-Wmissing-prototypes]
    2899 | void sched_set_stop_task(int cpu, struct task_struct *stop)
         |      ^~~~~~~~~~~~~~~~~~~
   kernel/sched/core.c: In function 'schedule_tail':
   kernel/sched/core.c:4316:13: warning: variable 'rq' set but not used [-Wunused-but-set-variable]
    4316 |  struct rq *rq;
         |             ^~


vim +/sched_core_get +123 kernel/sched/core.c

   122	
 > 123	void sched_core_get(void)
   124	{
   125		mutex_lock(&sched_core_mutex);
   126		if (!sched_core_count++)
   127			__sched_core_enable();
   128		mutex_unlock(&sched_core_mutex);
   129	}
   130	
 > 131	void sched_core_put(void)
   132	{
   133		mutex_lock(&sched_core_mutex);
   134		if (!--sched_core_count)
   135			__sched_core_disable();
   136		mutex_unlock(&sched_core_mutex);
   137	}
   138	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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