From: kernel test robot <lkp@intel.com>
To: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: kernel/watchdog.c:36:21: warning: 'watchdog_mutex' defined but not used
Date: Mon, 05 Oct 2026 17:21:40 +0200 [thread overview]
Message-ID: <202610051721.Ul6QI2Or-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: a90ee4305c4a5df72c11b31dacfdc76e00fcf78a
commit: 25500ba7e77ce9d3d9b5a1929d41a2ee2e23f6fe locking/mutex: Remove the list_head from struct mutex
date: 7 months ago
config: powerpc64-randconfig-r2202-20261005 (https://download.01.org/0day-ci/archive/20261005/202610051721.Ul6QI2Or-lkp@intel.com/config)
compiler: powerpc64-linux-gcc (GCC) 12.5.0
smatch: v0.5.0-9187-g5189e3fb
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261005/202610051721.Ul6QI2Or-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
| Fixes: 25500ba7e77c ("locking/mutex: Remove the list_head from struct mutex")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610051721.Ul6QI2Or-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from include/linux/kernfs.h:11,
from include/linux/sysfs.h:16,
from include/linux/kobject.h:20,
from include/linux/energy_model.h:7,
from include/linux/device.h:16,
from include/linux/node.h:18,
from include/linux/cpu.h:17,
from kernel/watchdog.c:15:
>> kernel/watchdog.c:36:21: warning: 'watchdog_mutex' defined but not used [-Wunused-variable]
36 | static DEFINE_MUTEX(watchdog_mutex);
| ^~~~~~~~~~~~~~
include/linux/mutex.h:87:22: note: in definition of macro 'DEFINE_MUTEX'
87 | struct mutex mutexname = __MUTEX_INITIALIZER(mutexname)
| ^~~~~~~~~
vim +/watchdog_mutex +36 kernel/watchdog.c
58687acba592667 Don Zickus 2010-05-07 35
946d197794b2320 Thomas Gleixner 2017-09-12 @36 static DEFINE_MUTEX(watchdog_mutex);
ab992dc38f9ae40 Peter Zijlstra 2015-05-18 37
:::::: The code at line 36 was first introduced by commit
:::::: 946d197794b23202b8b46c43016747c72fe23393 watchdog/core: Rename watchdog_proc_mutex
:::::: TO: Thomas Gleixner <tglx@linutronix.de>
:::::: CC: Ingo Molnar <mingo@kernel.org>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
reply other threads:[~2026-10-05 15:22 UTC|newest]
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