[rt-devel:linux-6.4.y-rt-rebase 46/79] kernel/printk/printk.c:3361:6: 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-6.4.y-rt-rebase
head:   fb7828286d1ee12dc132500e9fc84085ceadabc3
commit: 094c02761170c2bb60bfd8203fde8c553e30871c [46/79] printk: Add threaded printing support for BKL consoles.
config: csky-randconfig-001-20230922 (https://download.01.org/0day-ci/archive/20230922/202309221431.jWGSVvmz-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230922/202309221431.jWGSVvmz-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/202309221431.jWGSVvmz-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/printk/printk.c:3361:6: warning: no previous prototype for 'console_bkl_kthread_create' [-Wmissing-prototypes]
    3361 | void console_bkl_kthread_create(void)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/console_bkl_kthread_create +3361 kernel/printk/printk.c

  3360	
> 3361	void console_bkl_kthread_create(void)
  3362	{
  3363		struct task_struct *kt;
  3364		struct console *c;
  3365	
  3366		lockdep_assert_held(&console_mutex);
  3367	
  3368		if (!IS_ENABLED(CONFIG_PREEMPT_RT))
  3369			return;
  3370	
  3371		if (!printk_threads_enabled || console_bkl_kthread)
  3372			return;
  3373	
  3374		for_each_console(c) {
  3375			if (c->flags & CON_BOOT)
  3376				return;
  3377		}
  3378	
  3379		kt = kthread_run(console_bkl_kthread_func, NULL, "pr/bkl");
  3380		if (IS_ERR(kt)) {
  3381			pr_err("unable to start BKL printing thread\n");
  3382			return;
  3383		}
  3384	
  3385		console_bkl_kthread = kt;
  3386	
  3387		/*
  3388		 * It is important that console printing threads are scheduled
  3389		 * shortly after a printk call and with generous runtime budgets.
  3390		 */
  3391		sched_set_normal(console_bkl_kthread, -20);
  3392	}
  3393	

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