linux-kernel - Re: [PATCH] locking/mutex:add MUTEX_CHCEK_INIT to detect uninitialized mutex lock

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Message-ID: <202509242322.VggjpcD5-lkp@intel.com>
Date: Thu, 25 Sep 2025 00:15:17 +0800
From: kernel test robot <lkp@...el.com>
To: buckzhang1212@...h.net, Ingo Molnar <mingo@...hat.com>,
	Will Deacon <will@...nel.org>, Boqun Feng <boqun.feng@...il.com>,
	Waiman Long <longman@...hat.com>, linux-kernel@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, buckzhang1212@...h.net
Subject: Re: [PATCH] locking/mutex:add MUTEX_CHCEK_INIT to detect
 uninitialized mutex lock

Hi,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/locking/core]
[also build test WARNING on linus/master v6.17-rc7 next-20250923]
[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/buckzhang1212-yeah-net/locking-mutex-add-MUTEX_CHCEK_INIT-to-detect-uninitialized-mutex-lock/20250924-103805
base:   tip/locking/core
patch link:    https://lore.kernel.org/r/20250924022500.2577-1-buckzhang1212%40yeah.net
patch subject: [PATCH] locking/mutex:add MUTEX_CHCEK_INIT to detect uninitialized mutex lock
config: i386-randconfig-014-20250924 (https://download.01.org/0day-ci/archive/20250924/202509242322.VggjpcD5-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250924/202509242322.VggjpcD5-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/202509242322.VggjpcD5-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/locking/mutex.c:46:13: warning: 'mutex_check_waitlist' defined but not used [-Wunused-function]
      46 | static void mutex_check_waitlist(struct mutex *lock)
         |             ^~~~~~~~~~~~~~~~~~~~


vim +/mutex_check_waitlist +46 kernel/locking/mutex.c

    39	
    40	#ifdef CONFIG_DEBUG_MUTEXES
    41	# define MUTEX_WARN_ON(cond) DEBUG_LOCKS_WARN_ON(cond)
    42	#else
    43	# define MUTEX_WARN_ON(cond)
    44	#endif
    45	#define MUTEX_CHCEK_INIT(lock)  mutex_check_waitlist(lock)
  > 46	static void mutex_check_waitlist(struct mutex *lock)
    47	{
    48		struct list_head *list = &lock->wait_list;
    49	
    50		if ((unsigned long)list->next < PAGE_OFFSET) {
    51			pr_err("BUG: mutex lock is uninitialized，wait_list is Error\n");
    52			MUTEX_WARN_ON("mutex lock is uninitialized");
    53		}
    54	}
    55	

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