Re: [PATCH 3/3] watchdog/softlockup: add parameter to control the reporting of time-consuming hardirq

[kernel test robot]

Hi Bitao,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/irq/core]
[also build test WARNING on akpm-mm/mm-everything linus/master v6.8-rc1 next-20240125]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Bitao-Hu/watchdog-softlockup-low-overhead-detection-of-interrupt-storm/20240123-201509
base:   tip/irq/core
patch link:    https://lore.kernel.org/r/20240123121223.22318-4-yaoma%40linux.alibaba.com
patch subject: [PATCH 3/3] watchdog/softlockup: add parameter to control the reporting of time-consuming hardirq
config: i386-randconfig-012-20240126 (https://download.01.org/0day-ci/archive/20240126/202401261322.fGeoPvI9-lkp@xxxxxxxxx/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240126/202401261322.fGeoPvI9-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401261322.fGeoPvI9-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> kernel/watchdog.c:1088:5: warning: no previous prototype for 'proc_softlockup_irqtrace' [-Wmissing-prototypes]
    1088 | int proc_softlockup_irqtrace(struct ctl_table *table, int write,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~


vim +/proc_softlockup_irqtrace +1088 kernel/watchdog.c

  1084	
  1085	/*
  1086	 * /proc/sys/kernel/softlockup_irqtrace
  1087	 */
> 1088	int proc_softlockup_irqtrace(struct ctl_table *table, int write,
  1089				 void *buffer, size_t *lenp, loff_t *ppos)
  1090	{
  1091		int err, old;
  1092	
  1093		mutex_lock(&watchdog_mutex);
  1094	
  1095		old = READ_ONCE(softlockup_irqtrace);
  1096		err = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
  1097	
  1098		if (!err && write && old != READ_ONCE(softlockup_irqtrace))
  1099			proc_watchdog_update();
  1100	
  1101		mutex_unlock(&watchdog_mutex);
  1102		return err;
  1103	}
  1104	

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