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Subjectinclude/linux/spinlock.h:408:9: sparse: sparse: context imbalance in 'ks8851_unlock_par' - unexpected unlock
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 83bdc7275e6206f560d247be856bceba3e1ed8f2
commit: 797047f875b5463719cc70ba213eb691d453c946 net: ks8851: Implement Parallel bus operations
date: 9 weeks ago
config: arm-randconfig-s031-20200730 (attached as .config)
compiler: arm-linux-gnueabi-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: v0.6.2-98-g4932334a-dirty
git checkout 797047f875b5463719cc70ba213eb691d453c946
# 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=arm

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 >>)

drivers/net/ethernet/micrel/ks8851_par.c:64:13: sparse: sparse: context imbalance in 'ks8851_lock_par' - wrong count at exit
drivers/net/ethernet/micrel/ks8851_par.c: note: in included file (through include/linux/seqlock.h, include/linux/time.h, include/linux/ktime.h, ...):
>> include/linux/spinlock.h:408:9: sparse: sparse: context imbalance in 'ks8851_unlock_par' - unexpected unlock

vim +/ks8851_unlock_par +408 include/linux/spinlock.h

c2f21ce2e31286 Thomas Gleixner 2009-12-02 405
3490565b633c70 Denys Vlasenko 2015-07-13 406 static __always_inline void spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
c2f21ce2e31286 Thomas Gleixner 2009-12-02 407 {
c2f21ce2e31286 Thomas Gleixner 2009-12-02 @408 raw_spin_unlock_irqrestore(&lock->rlock, flags);
c2f21ce2e31286 Thomas Gleixner 2009-12-02 409 }
c2f21ce2e31286 Thomas Gleixner 2009-12-02 410

:::::: The code at line 408 was first introduced by commit
:::::: c2f21ce2e31286a0a32f8da0a7856e9ca1122ef3 locking: Implement new raw_spinlock

:::::: TO: Thomas Gleixner <tglx@linutronix.de>
:::::: CC: Thomas Gleixner <tglx@linutronix.de>

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