include/linux/spinlock.h:378:9: sparse: sparse: context imbalance in 'cfspi_ss_cb' - unexpected unlock

From: kernel test robot
Date: Mon Jul 27 2020 - 10:38:46 EST

tree: master
head: 92ed301919932f777713b9172e525674157e983d
commit: 80591e61a0f7e88deaada69844e4a31280c4a38f kbuild: tell sparse about the $ARCH
date: 9 months ago
config: nios2-randconfig-s032-20200727 (attached as .config)
compiler: nios2-linux-gcc (GCC) 9.3.0
wget -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.2-94-geb6779f6-dirty
git checkout 80591e61a0f7e88deaada69844e4a31280c4a38f
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=nios2

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

sparse warnings: (new ones prefixed by >>)

drivers/net/caif/caif_spi.c: note: in included file (through include/linux/seqlock.h, include/linux/time.h, include/linux/stat.h, ...):
>> include/linux/spinlock.h:378:9: sparse: sparse: context imbalance in 'cfspi_ss_cb' - unexpected unlock

vim +/cfspi_ss_cb +378 include/linux/spinlock.h

c2f21ce2e31286 Thomas Gleixner 2009-12-02 375
3490565b633c70 Denys Vlasenko 2015-07-13 376 static __always_inline void spin_unlock(spinlock_t *lock)
c2f21ce2e31286 Thomas Gleixner 2009-12-02 377 {
c2f21ce2e31286 Thomas Gleixner 2009-12-02 @378 raw_spin_unlock(&lock->rlock);
c2f21ce2e31286 Thomas Gleixner 2009-12-02 379 }
c2f21ce2e31286 Thomas Gleixner 2009-12-02 380

:::::: The code at line 378 was first introduced by commit
:::::: c2f21ce2e31286a0a32f8da0a7856e9ca1122ef3 locking: Implement new raw_spinlock

:::::: TO: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
:::::: CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

0-DAY CI Kernel Test Service, Intel Corporation

Attachment: .config.gz
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