[rt-devel:linux-6.3.y-rt 4/5] kernel/printk/printk.c:3365:6: warning: no previous prototype for 'console_bkl_kthread_create'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-6.3.y-rt
head:   93adb32305897d3e6cb5b333fb8873ecff8c68fe
commit: b111e33ae076e9a8cdedb202d0391d23ed420e96 [4/5] printk: Update John's printk series.
config: csky-randconfig-r025-20230322 (https://download.01.org/0day-ci/archive/20230324/202303241710.83IbYO2x-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 12.1.0
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/rt/linux-rt-devel.git/commit/?id=b111e33ae076e9a8cdedb202d0391d23ed420e96
        git remote add rt-devel https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
        git fetch --no-tags rt-devel linux-6.3.y-rt
        git checkout b111e33ae076e9a8cdedb202d0391d23ed420e96
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=csky olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=csky SHELL=/bin/bash kernel/printk/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303241710.83IbYO2x-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/printk/printk.c:3365:6: warning: no previous prototype for 'console_bkl_kthread_create' [-Wmissing-prototypes]
    3365 | void console_bkl_kthread_create(void)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/console_bkl_kthread_create +3365 kernel/printk/printk.c

  3364	
> 3365	void console_bkl_kthread_create(void)
  3366	{
  3367		struct task_struct *kt;
  3368		struct console *c;
  3369	
  3370		lockdep_assert_held(&console_mutex);
  3371	
  3372		if (!IS_ENABLED(CONFIG_PREEMPT_RT))
  3373			return;
  3374	
  3375		if (!printk_threads_enabled || console_bkl_kthread)
  3376			return;
  3377	
  3378		for_each_console(c) {
  3379			if (c->flags & CON_BOOT)
  3380				return;
  3381		}
  3382	
  3383		kt = kthread_run(console_bkl_kthread_func, NULL, "pr/bkl");
  3384		if (IS_ERR(kt)) {
  3385			pr_err("unable to start BKL printing thread\n");
  3386			return;
  3387		}
  3388	
  3389		console_bkl_kthread = kt;
  3390	
  3391		/*
  3392		 * It is important that console printing threads are scheduled
  3393		 * shortly after a printk call and with generous runtime budgets.
  3394		 */
  3395		sched_set_normal(console_bkl_kthread, -20);
  3396	}
  3397	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests