linux-kernel - Re: [paulmck-rcu:dev.2022.01.04a 55/55] kernel/time/timer.c:1776:6: warning: no previous prototype for 'tick_setup_sched_timer

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Date:   Fri, 7 Jan 2022 20:28:49 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [paulmck-rcu:dev.2022.01.04a 55/55] kernel/time/timer.c:1776:6:
 warning: no previous prototype for 'tick_setup_sched_timer_dump'

On Sat, Jan 08, 2022 at 08:41:32AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2022.01.04a
> head:   64595d0dff992756e8c6d53c0e9f1e3e50c451f7
> commit: 64595d0dff992756e8c6d53c0e9f1e3e50c451f7 [55/55] squash! EXP timers: Non-nohz_full last-resort jiffies update on IRQ entry
> config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20220108/202201080834.rGuSv2SS-lkp@intel.com/config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
> reproduce (this is a W=1 build):
>         # https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?id=64595d0dff992756e8c6d53c0e9f1e3e50c451f7
>         git remote add paulmck-rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
>         git fetch --no-tags paulmck-rcu dev.2022.01.04a
>         git checkout 64595d0dff992756e8c6d53c0e9f1e3e50c451f7
>         # save the config file to linux build tree
>         mkdir build_dir
>         make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash kernel/time/
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>

Good catch, but this was due to debug code that has since been removed.

							Thanx, Paul

> All warnings (new ones prefixed by >>):
> 
>    kernel/time/timer.c:254:5: warning: no previous prototype for 'timer_migration_handler' [-Wmissing-prototypes]
>      254 | int timer_migration_handler(struct ctl_table *table, int write,
>          |     ^~~~~~~~~~~~~~~~~~~~~~~
> >> kernel/time/timer.c:1776:6: warning: no previous prototype for 'tick_setup_sched_timer_dump' [-Wmissing-prototypes]
>     1776 | void tick_setup_sched_timer_dump(void)
>          |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> 
> vim +/tick_setup_sched_timer_dump +1776 kernel/time/timer.c
> 
>   1775	
> > 1776	void tick_setup_sched_timer_dump(void)
>   1777	{
>   1778		int cpu;
>   1779		int j = jiffies;
>   1780	
>   1781		pr_alert("%s state", __func__);
>   1782		for_each_possible_cpu(cpu)
>   1783			pr_cont(" j/c %x/%d %c",
>   1784				(int)(j - per_cpu(tick_setup_sched_timer_jiffies, cpu)) & 0xfff,
>   1785				per_cpu(tick_setup_sched_timer_jiffies_count, cpu),
>   1786				".H"[per_cpu(tick_setup_sched_timer_help_needed, cpu)]);
>   1787		pr_cont("\n");
>   1788	}
>   1789	
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org