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Subjectinclude/asm-generic/qspinlock.h:94:9: sparse: sparse: context imbalance in 'rcu_nocb_unlock' - unexpected unlock
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: d15be546031cf65a0fc34879beca02fd90fe7ac7
commit: 5d6742b37727e111f4755155e59c5319cf5caa7b rcu/nocb: Use rcu_segcblist for no-CBs CPUs
date: 12 months ago
config: sparc64-randconfig-s031-20200723 (attached as .config)
compiler: sparc64-linux-gcc (GCC) 9.3.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.2-93-g4c6cbe55-dirty
git checkout 5d6742b37727e111f4755155e59c5319cf5caa7b
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=sparc64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)

kernel/rcu/tree.c:1124:13: sparse: sparse: context imbalance in 'rcu_start_this_gp' - different lock contexts for basic block
kernel/rcu/tree.c:1520:9: sparse: sparse: context imbalance in 'rcu_gp_init' - different lock contexts for basic block
kernel/rcu/tree.c:2226:9: sparse: sparse: context imbalance in 'force_qs_rnp' - different lock contexts for basic block
kernel/rcu/tree.c: note: in included file (through arch/sparc/include/asm/qspinlock.h, arch/sparc/include/asm/spinlock_64.h, arch/sparc/include/asm/spinlock.h, ...):
include/asm-generic/qspinlock.h:94:9: sparse: sparse: context imbalance in 'rcu_force_quiescent_state' - unexpected unlock
kernel/rcu/tree.c: note: in included file:
kernel/rcu/tree_exp.h:193:9: sparse: sparse: context imbalance in '__rcu_report_exp_rnp' - different lock contexts for basic block
kernel/rcu/tree.c: note: in included file:
kernel/rcu/tree_plugin.h:1503:9: sparse: sparse: context imbalance in 'rcu_nocb_lock' - wrong count at exit
kernel/rcu/tree.c: note: in included file (through arch/sparc/include/asm/qspinlock.h, arch/sparc/include/asm/spinlock_64.h, arch/sparc/include/asm/spinlock.h, ...):
>> include/asm-generic/qspinlock.h:94:9: sparse: sparse: context imbalance in 'rcu_nocb_unlock' - unexpected unlock
kernel/rcu/tree.c: note: in included file:
kernel/rcu/tree_plugin.h:1530:17: sparse: sparse: context imbalance in 'rcu_nocb_unlock_irqrestore' - unexpected unlock
kernel/rcu/tree_plugin.h:1611:13: sparse: sparse: context imbalance in '__call_rcu_nocb_wake' - wrong count at exit

vim +/rcu_nocb_unlock +94 include/asm-generic/qspinlock.h

a33fda35e3a7655 Waiman Long 2015-04-24 83
a33fda35e3a7655 Waiman Long 2015-04-24 84 #ifndef queued_spin_unlock
a33fda35e3a7655 Waiman Long 2015-04-24 85 /**
a33fda35e3a7655 Waiman Long 2015-04-24 86 * queued_spin_unlock - release a queued spinlock
a33fda35e3a7655 Waiman Long 2015-04-24 87 * @lock : Pointer to queued spinlock structure
a33fda35e3a7655 Waiman Long 2015-04-24 88 */
a33fda35e3a7655 Waiman Long 2015-04-24 89 static __always_inline void queued_spin_unlock(struct qspinlock *lock)
a33fda35e3a7655 Waiman Long 2015-04-24 90 {
a33fda35e3a7655 Waiman Long 2015-04-24 91 /*
ca50e426f96c905 Pan Xinhui 2016-06-03 92 * unlock() needs release semantics:
a33fda35e3a7655 Waiman Long 2015-04-24 93 */
626e5fbc1435890 Will Deacon 2018-04-26 @94 smp_store_release(&lock->locked, 0);
a33fda35e3a7655 Waiman Long 2015-04-24 95 }
a33fda35e3a7655 Waiman Long 2015-04-24 96 #endif
a33fda35e3a7655 Waiman Long 2015-04-24 97

:::::: The code at line 94 was first introduced by commit
:::::: 626e5fbc14358901ddaa90ce510e0fbeab310432 locking/qspinlock: Use smp_store_release() in queued_spin_unlock()

:::::: TO: Will Deacon <will.deacon@arm.com>
:::::: CC: Ingo Molnar <mingo@kernel.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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