Re: [PATCH printk v3 11/19] printk: nbcon: Rely on kthreads for normal operation

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

Hi John,

kernel test robot noticed the following build errors:

[auto build test ERROR on b18703ea7157f62f02eb0ceb11f6fa0138e90adc]

url:    https://github.com/intel-lab-lkp/linux/commits/John-Ogness/printk-nbcon-Clarify-nbcon_get_default_prio-context/20240723-015154
base:   b18703ea7157f62f02eb0ceb11f6fa0138e90adc
patch link:    https://lore.kernel.org/r/20240722171939.3349410-12-john.ogness%40linutronix.de
patch subject: [PATCH printk v3 11/19] printk: nbcon: Rely on kthreads for normal operation
config: x86_64-buildonly-randconfig-002-20240723 (https://download.01.org/0day-ci/archive/20240723/202407231117.SngBfEcI-lkp@intel.com/config)
compiler: gcc-10 (Ubuntu 10.5.0-1ubuntu1) 10.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240723/202407231117.SngBfEcI-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/202407231117.SngBfEcI-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from kernel/printk/printk.c:62:
   kernel/printk/internal.h: In function 'printk_get_console_flush_type':
   kernel/printk/internal.h:219:26: error: implicit declaration of function 'is_printk_deferred'; did you mean '_printk_deferred'? [-Werror=implicit-function-declaration]
     219 |    if (prefer_offload || is_printk_deferred())
         |                          ^~~~~~~~~~~~~~~~~~
         |                          _printk_deferred
   kernel/printk/printk.c: In function 'resume_console':
>> kernel/printk/printk.c:2706:3: error: implicit declaration of function 'nbcon_wake_kthreads'; did you mean 'irq_wake_thread'? [-Werror=implicit-function-declaration]
    2706 |   nbcon_wake_kthreads();
         |   ^~~~~~~~~~~~~~~~~~~
         |   irq_wake_thread
   cc1: some warnings being treated as errors


vim +2706 kernel/printk/printk.c

  2683	
  2684	void resume_console(void)
  2685	{
  2686		struct console_flush_type ft;
  2687		struct console *con;
  2688	
  2689		if (!console_suspend_enabled)
  2690			return;
  2691	
  2692		console_list_lock();
  2693		for_each_console(con)
  2694			console_srcu_write_flags(con, con->flags & ~CON_SUSPENDED);
  2695		console_list_unlock();
  2696	
  2697		/*
  2698		 * Ensure that all SRCU list walks have completed. All printing
  2699		 * contexts must be able to see they are no longer suspended so
  2700		 * that they are guaranteed to wake up and resume printing.
  2701		 */
  2702		synchronize_srcu(&console_srcu);
  2703	
  2704		printk_get_console_flush_type(&ft, true);
  2705		if (ft.nbcon_offload)
> 2706			nbcon_wake_kthreads();
  2707	
  2708		pr_flush(1000, true);
  2709	}
  2710	

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