include/linux/atomic-fallback.h:439:9: sparse: sparse: context imbalance in 'btrfs_set_lock_blocking_read' - unexpected unlock

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   bfe91da29bfad9941d5d703d45e29f0812a20724
commit: d6156218bec93965b6a43ba2686ad962ce77c854 btrfs: make locking assertion helpers static inline
date:   8 months ago
config: ia64-randconfig-s031-20200707 (attached as .config)
compiler: ia64-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: v0.6.2-31-gabbfd661-dirty
        git checkout d6156218bec93965b6a43ba2686ad962ce77c854
        # 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=ia64 

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


sparse warnings: (new ones prefixed by >>)

>> include/linux/atomic-fallback.h:439:9: sparse: sparse: context imbalance in 'btrfs_set_lock_blocking_read' - unexpected unlock
   fs/btrfs/locking.c:25:9: sparse: sparse: context imbalance in 'btrfs_set_lock_blocking_write' - unexpected unlock
   fs/btrfs/locking.c:127:6: sparse: sparse: context imbalance in 'btrfs_tree_read_lock' - different lock contexts for basic block
   fs/btrfs/locking.c:166:5: sparse: sparse: context imbalance in 'btrfs_tree_read_lock_atomic' - different lock contexts for basic block
   fs/btrfs/locking.c:186:5: sparse: sparse: context imbalance in 'btrfs_try_tree_read_lock' - different lock contexts for basic block
   fs/btrfs/locking.c:208:5: sparse: sparse: context imbalance in 'btrfs_try_tree_write_lock' - different lock contexts for basic block
>> include/linux/atomic-fallback.h:439:9: sparse: sparse: context imbalance in 'btrfs_tree_read_unlock' - unexpected unlock
   fs/btrfs/locking.c:19:9: sparse: sparse: context imbalance in 'btrfs_tree_lock' - wrong count at exit
   fs/btrfs/locking.c:25:9: sparse: sparse: context imbalance in 'btrfs_tree_unlock' - unexpected unlock

vim +/btrfs_set_lock_blocking_read +439 include/linux/atomic-fallback.h

9fa45070a2e59a Mark Rutland 2018-09-04  434  
9fa45070a2e59a Mark Rutland 2018-09-04  435  #ifndef atomic_dec
9fa45070a2e59a Mark Rutland 2018-09-04  436  static inline void
9fa45070a2e59a Mark Rutland 2018-09-04  437  atomic_dec(atomic_t *v)
9fa45070a2e59a Mark Rutland 2018-09-04  438  {
9fa45070a2e59a Mark Rutland 2018-09-04 @439  	atomic_sub(1, v);
9fa45070a2e59a Mark Rutland 2018-09-04  440  }
9fa45070a2e59a Mark Rutland 2018-09-04  441  #define atomic_dec atomic_dec
9fa45070a2e59a Mark Rutland 2018-09-04  442  #endif
9fa45070a2e59a Mark Rutland 2018-09-04  443  

:::::: The code at line 439 was first introduced by commit
:::::: 9fa45070a2e59a871e1cd3370173369f3a4f61e2 locking/atomics: Switch to generated fallbacks

:::::: TO: Mark Rutland <mark.rutland@xxxxxxx>
:::::: CC: Ingo Molnar <mingo@xxxxxxxxxx>

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

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