linux-kernel - Re: [PATCH] clocksource: Skip watchdog check for large watchdog intervals

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Message-ID: <202401040845.lHig8Ei0-lkp@intel.com>
Date: Thu, 4 Jan 2024 08:46:57 +0800
From: kernel test robot <lkp@...el.com>
To: Jiri Wiesner <jwiesner@...e.de>, linux-kernel@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, John Stultz <jstultz@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Stephen Boyd <sboyd@...nel.org>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Feng Tang <feng.tang@...el.com>
Subject: Re: [PATCH] clocksource: Skip watchdog check for large watchdog
 intervals

Hi Jiri,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/timers/core]
[also build test WARNING on linus/master v6.7-rc8 next-20240103]
[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/Jiri-Wiesner/clocksource-Skip-watchdog-check-for-large-watchdog-intervals/20240103-192257
base:   tip/timers/core
patch link:    https://lore.kernel.org/r/20240103112113.GA6108%40incl
patch subject: [PATCH] clocksource: Skip watchdog check for large watchdog intervals
config: i386-buildonly-randconfig-001-20240104 (https://download.01.org/0day-ci/archive/20240104/202401040845.lHig8Ei0-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240104/202401040845.lHig8Ei0-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401040845.lHig8Ei0-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/dev_printk.h:14:0,
                    from include/linux/device.h:15,
                    from kernel/time/clocksource.c:10:
   kernel/time/clocksource.c: In function 'clocksource_watchdog':
>> kernel/time/clocksource.c:103:6: warning: integer overflow in expression [-Woverflow]
         * NSEC_PER_SEC / HZ)
         ^
   include/linux/compiler.h:77:42: note: in definition of macro 'unlikely'
    # define unlikely(x) __builtin_expect(!!(x), 0)
                                             ^
   kernel/time/clocksource.c:486:27: note: in expansion of macro 'WATCHDOG_INTR_MAX_NS'
      if (unlikely(interval > WATCHDOG_INTR_MAX_NS)) {
                              ^~~~~~~~~~~~~~~~~~~~


vim +103 kernel/time/clocksource.c

    97	
    98	/*
    99	 * Interval: 0.5sec.
   100	 */
   101	#define WATCHDOG_INTERVAL	(HZ >> 1)
   102	#define WATCHDOG_INTR_MAX_NS	((WATCHDOG_INTERVAL + (WATCHDOG_INTERVAL >> 1))\
 > 103					 * NSEC_PER_SEC / HZ)
   104	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki