On 2022-04-20, kernel test robot <lkp@intel.com> wrote:
>>> kernel/printk/printk.c:2703:6: warning: no previous prototype for 'console_lock_single_hold' [-Wmissing-prototypes]
>     2703 | void console_lock_single_hold(struct console *con)
>          |      ^~~~~~~~~~~~~~~~~~~~~~~~

I forgot to make it static. Thanks lkp!

John Ogness