linux-kernel - [paulmck-rcu:srcu-cf.2023.03.23a 14/20] kernel/rcu/tasks.h:140:20: warning: 'tasks_rcu_exit

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Message-ID: <202303241725.0RIyOS2U-lkp@intel.com>
Date:   Fri, 24 Mar 2023 17:44:41 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [paulmck-rcu:srcu-cf.2023.03.23a 14/20] kernel/rcu/tasks.h:140:20:
 warning: 'tasks_rcu_exit_srcu' defined but not used

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git srcu-cf.2023.03.23a
head:   01abd52f1773d0ad92560b79bb55b48e26da06d5
commit: fd18a19e0cef4deac7fb327209443a851355653a [14/20] srcu: Move work-scheduling fields from srcu_struct to srcu_usage
config: x86_64-rhel-8.3-kselftests (https://download.01.org/0day-ci/archive/20230324/202303241725.0RIyOS2U-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?id=fd18a19e0cef4deac7fb327209443a851355653a
        git remote add paulmck-rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
        git fetch --no-tags paulmck-rcu srcu-cf.2023.03.23a
        git checkout fd18a19e0cef4deac7fb327209443a851355653a
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303241725.0RIyOS2U-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/srcu.h:49,
                    from include/linux/notifier.h:16,
                    from arch/x86/include/asm/uprobes.h:13,
                    from include/linux/uprobes.h:49,
                    from include/linux/mm_types.h:16,
                    from include/linux/sched/signal.h:13,
                    from kernel/rcu/update.c:26:
>> kernel/rcu/tasks.h:140:20: warning: 'tasks_rcu_exit_srcu' defined but not used [-Wunused-variable]
     140 | DEFINE_STATIC_SRCU(tasks_rcu_exit_srcu);
         |                    ^~~~~~~~~~~~~~~~~~~
   include/linux/srcutree.h:171:38: note: in definition of macro '__DEFINE_SRCU'
     171 |         is_static struct srcu_struct name =                                                     \
         |                                      ^~~~
   kernel/rcu/tasks.h:140:1: note: in expansion of macro 'DEFINE_STATIC_SRCU'
     140 | DEFINE_STATIC_SRCU(tasks_rcu_exit_srcu);
         | ^~~~~~~~~~~~~~~~~~


vim +/tasks_rcu_exit_srcu +140 kernel/rcu/tasks.h

07e105158d97b4 Paul E. McKenney 2020-03-02  138  
eacd6f04a13331 Paul E. McKenney 2020-03-02  139  /* Track exiting tasks in order to allow them to be waited for. */
eacd6f04a13331 Paul E. McKenney 2020-03-02 @140  DEFINE_STATIC_SRCU(tasks_rcu_exit_srcu);
eacd6f04a13331 Paul E. McKenney 2020-03-02  141  

:::::: The code at line 140 was first introduced by commit
:::::: eacd6f04a1333187dd3e96e5635c0edce0a2e354 rcu-tasks: Move Tasks RCU to its own file

:::::: TO: Paul E. McKenney <paulmck@...nel.org>
:::::: CC: Paul E. McKenney <paulmck@...nel.org>

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