linux-kernel - include/linux/rwlock_api_smp.h:226:9: sparse: sparse: context imbalance in 'prb_clear_blk_fill_status'

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Message-ID: <202008111610.w5Cew0mF%lkp@intel.com>
Date:   Tue, 11 Aug 2020 16:54:20 +0800
From:   kernel test robot <lkp@...el.com>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>
Subject: include/linux/rwlock_api_smp.h:226:9: sparse: sparse: context
 imbalance in 'prb_clear_blk_fill_status' - unexpected unlock

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   00e4db51259a5f936fec1424b884f029479d3981
commit: 632ca50f2cbd8809a2fc1934b4b2c9c49bd55e98 af_packet: TPACKET_V3: replace busy-wait loop
date:   4 weeks ago
config: arm64-randconfig-s032-20200811 (attached as .config)
compiler: aarch64-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: v0.6.2-168-g9554805c-dirty
        git checkout 632ca50f2cbd8809a2fc1934b4b2c9c49bd55e98
        # 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=arm64 

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


sparse warnings: (new ones prefixed by >>)

   net/packet/af_packet.c: note: in included file (through include/linux/spinlock_api_smp.h, include/linux/spinlock.h, include/linux/mmzone.h, ...):
>> include/linux/rwlock_api_smp.h:226:9: sparse: sparse: context imbalance in 'prb_clear_blk_fill_status' - unexpected unlock
   net/packet/af_packet.c:1001:9: sparse: sparse: context imbalance in 'prb_fill_curr_block' - wrong count at exit
   net/packet/af_packet.c: note: in included file (through arch/arm64/include/asm/smp.h, include/linux/smp.h, arch/arm64/include/asm/arch_timer.h, ...):
   arch/arm64/include/asm/percpu.h:112:1: sparse: sparse: cast truncates bits from constant value (ffffffff becomes ff)
   arch/arm64/include/asm/percpu.h:112:1: sparse: sparse: cast truncates bits from constant value (ffffffff becomes ffff)

vim +/prb_clear_blk_fill_status +226 include/linux/rwlock_api_smp.h

6b6b4792f89346 Thomas Gleixner 2009-11-16  222  
9c1721aa4994f6 Thomas Gleixner 2009-12-03  223  static inline void __raw_read_unlock(rwlock_t *lock)
6b6b4792f89346 Thomas Gleixner 2009-11-16  224  {
5facae4f3549b5 Qian Cai        2019-09-19  225  	rwlock_release(&lock->dep_map, _RET_IP_);
9828ea9d75c38f Thomas Gleixner 2009-12-03 @226  	do_raw_read_unlock(lock);
6b6b4792f89346 Thomas Gleixner 2009-11-16  227  	preempt_enable();
6b6b4792f89346 Thomas Gleixner 2009-11-16  228  }
6b6b4792f89346 Thomas Gleixner 2009-11-16  229  

:::::: The code at line 226 was first introduced by commit
:::::: 9828ea9d75c38fe3dce05d00566eed61c85732e6 locking: Further name space cleanups

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

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

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