kernel/locking/locktorture.c:127:23: sparse: sparse: symbol 'call_rcu_chain' was not declared. Should it be static?

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   791c8ab095f71327899023223940dd52257a4173
commit: 7f993623e9ebcd633c0f760991e5078b95a37db3 locktorture: Add call_rcu_chains module parameter
date:   8 weeks ago
config: x86_64-randconfig-x001-20230717 (https://download.01.org/0day-ci/archive/20231118/202311181621.k1LVEHqR-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231118/202311181621.k1LVEHqR-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/202311181621.k1LVEHqR-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> kernel/locking/locktorture.c:127:23: sparse: sparse: symbol 'call_rcu_chain' was not declared. Should it be static?
   kernel/locking/locktorture.c:496:12: sparse: sparse: context imbalance in 'torture_mutex_lock' - wrong count at exit
   kernel/locking/locktorture.c:512:13: sparse: sparse: context imbalance in 'torture_mutex_unlock' - wrong count at exit
   kernel/locking/locktorture.c:570:12: sparse: sparse: context imbalance in 'torture_ww_mutex_lock' - wrong count at exit
   kernel/locking/locktorture.c: note: in included file:
   include/linux/ww_mutex.h:191:9: sparse: sparse: context imbalance in 'torture_ww_mutex_unlock' - wrong count at exit
   kernel/locking/locktorture.c:665:12: sparse: sparse: context imbalance in 'torture_rtmutex_lock' - wrong count at exit
   kernel/locking/locktorture.c:689:13: sparse: sparse: context imbalance in 'torture_rtmutex_unlock' - wrong count at exit
   kernel/locking/locktorture.c:729:12: sparse: sparse: context imbalance in 'torture_rwsem_down_write' - wrong count at exit
   kernel/locking/locktorture.c:745:13: sparse: sparse: context imbalance in 'torture_rwsem_up_write' - wrong count at exit
   kernel/locking/locktorture.c:751:12: sparse: sparse: context imbalance in 'torture_rwsem_down_read' - wrong count at exit
   kernel/locking/locktorture.c:769:13: sparse: sparse: context imbalance in 'torture_rwsem_up_read' - wrong count at exit
   kernel/locking/locktorture.c:799:12: sparse: sparse: context imbalance in 'torture_percpu_rwsem_down_write' - wrong count at exit
   kernel/locking/locktorture.c:806:13: sparse: sparse: context imbalance in 'torture_percpu_rwsem_up_write' - wrong count at exit
   kernel/locking/locktorture.c: note: in included file:
   include/linux/percpu-rwsem.h:70:9: sparse: sparse: context imbalance in 'torture_percpu_rwsem_down_read' - wrong count at exit
   include/linux/percpu-rwsem.h:121:9: sparse: sparse: context imbalance in 'torture_percpu_rwsem_up_read' - wrong count at exit

vim +/call_rcu_chain +127 kernel/locking/locktorture.c

   122	
   123	struct call_rcu_chain {
   124		struct rcu_head crc_rh;
   125		bool crc_stop;
   126	};
 > 127	struct call_rcu_chain *call_rcu_chain;
   128	

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