tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   92477dd1faa650e50bd3bb35a6c0b8d09198cc35
commit: 8a99b6833c884fa0e7919030d93fecedc69fc625 sched: Move SCHED_DEBUG sysctl to debugfs
date:   5 months ago
config: h8300-randconfig-r014-20210927 (attached as .config)
compiler: h8300-linux-gcc (GCC) 11.2.0
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/torvalds/linux.git/commit/?id=8a99b6833c884fa0e7919030d93fecedc69fc625
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 8a99b6833c884fa0e7919030d93fecedc69fc625
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=h8300 

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/fair.c:637:5: warning: no previous prototype for 'sched_update_scaling' [-Wmissing-prototypes]
     637 | int sched_update_scaling(void)
         |     ^~~~~~~~~~~~~~~~~~~~


vim +/sched_update_scaling +637 kernel/sched/fair.c

   632	
   633	/**************************************************************
   634	 * Scheduling class statistics methods:
   635	 */
   636	
 > 637	int sched_update_scaling(void)
   638	{
   639		unsigned int factor = get_update_sysctl_factor();
   640	
   641		sched_nr_latency = DIV_ROUND_UP(sysctl_sched_latency,
   642						sysctl_sched_min_granularity);
   643	

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