[rt-devel:linux-6.4.y-rt-rebase 46/79] kernel/printk/printk.c:3361:6: warning: no previous prototype for function 'console_bkl_kthread_create'

kernel test robot
2023-06-05T22:27:31Z

tree: https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-6.4.y-rt-rebase
head: 0576a708b07124cac8205893c9ed734ee41f64a9
commit: 094c02761170c2bb60bfd8203fde8c553e30871c [46/79] printk: Add threaded printing support for BKL consoles.
config: riscv-randconfig-r002-20230605 (https://download.01.org/0day-ci/archive/20230606/202306060658.sq3c4uqM-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 4faf3aaf28226a4e950c103a14f6fc1d1fdabb1b)
reproduce (this is a W=1 build):
mkdir -p ~/bin
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install riscv cross compiling tool for clang build
# apt-get install binutils-riscv64-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/commit/?id=094c02761170c2bb60bfd8203fde8c553e30871c
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-6.4.y-rt-rebase
git checkout 094c02761170c2bb60bfd8203fde8c553e30871c
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=riscv olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash kernel/printk/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306060658.sq3c4uqM-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]
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
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

--
0-DAY CI Kernel Test Service