linux-kernel - [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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Message-ID: <202201080834.rGuSv2SS-lkp@intel.com>
Date:   Sat, 8 Jan 2022 08:41:32 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [paulmck-rcu:dev.2022.01.04a 55/55] kernel/time/timer.c:1776:6:
 warning: no previous prototype for 'tick_setup_sched_timer_dump'

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>

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