[rt-devel:linux-6.5.y-rt-rebase 49/87] kernel/printk/printk.c:3361:6: warning: no previous prototype for function '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-6.5.y-rt-rebase
head:   c328ba8602906864849212de9927db3542a6d9f1
commit: ebf7d7c2929535b0203001866e5d1f816bc46c6f [49/87] printk: Add threaded printing support for BKL consoles.
config: powerpc64-randconfig-r022-20230826 (https://download.01.org/0day-ci/archive/20230826/202308260912.i1Fadnhp-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230826/202308260912.i1Fadnhp-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/202308260912.i1Fadnhp-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/printk/printk.c:3361:6: warning: no previous prototype for function 'console_bkl_kthread_create' [-Wmissing-prototypes]
    3361 | void console_bkl_kthread_create(void)
         |      ^
   kernel/printk/printk.c:3361:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    3361 | void console_bkl_kthread_create(void)
         | ^
         | static 
   1 warning generated.


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	

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