linux-kernel - include/asm-generic/mmiowb.h:56:9: sparse: sparse: context imbalance in 'cm_queue_work_unlock'

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Date:   Mon, 8 Jun 2020 18:51:04 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jason Gunthorpe <jgg@...lanox.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Leon Romanovsky <leonro@...lanox.com>
Subject: include/asm-generic/mmiowb.h:56:9: sparse: sparse: context imbalance
 in 'cm_queue_work_unlock' - unexpected unlock

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   af7b4801030c07637840191c69eb666917e4135d
commit: e83f195aa45c1ffd73b3a950a887e41c260cf194 RDMA/cm: Pull duplicated code into cm_queue_work_unlock()
date:   4 weeks ago
config: riscv-randconfig-s032-20200608 (attached as .config)
compiler: riscv64-linux-gcc (GCC) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-247-gcadbd124-dirty
        git checkout e83f195aa45c1ffd73b3a950a887e41c260cf194
        # save the attached .config to linux build tree
        make W=1 C=1 ARCH=riscv CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

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 >>)

   drivers/infiniband/core/cm.c:1297:21: sparse: sparse: cast from restricted __be32
>> include/asm-generic/mmiowb.h:56:9: sparse: sparse: context imbalance in 'cm_queue_work_unlock' - unexpected unlock
   drivers/infiniband/core/cm.c:2043:12: sparse: sparse: context imbalance in 'cm_req_handler' - different lock contexts for basic block
   drivers/infiniband/core/cm.c:2422:12: sparse: sparse: context imbalance in 'cm_rep_handler' - different lock contexts for basic block
   drivers/infiniband/core/cm.c:2533:12: sparse: sparse: context imbalance in 'cm_establish_handler' - different lock contexts for basic block
   drivers/infiniband/core/cm.c:2556:12: sparse: sparse: context imbalance in 'cm_rtu_handler' - different lock contexts for basic block
   drivers/infiniband/core/cm.c:2770:12: sparse: sparse: context imbalance in 'cm_dreq_handler' - different lock contexts for basic block
   drivers/infiniband/core/cm.c:2847:12: sparse: sparse: context imbalance in 'cm_drep_handler' - different lock contexts for basic block
   drivers/infiniband/core/cm.c:2995:12: sparse: sparse: context imbalance in 'cm_rej_handler' - wrong count at exit
   drivers/infiniband/core/cm.c:3153:12: sparse: sparse: context imbalance in 'cm_mra_handler' - different lock contexts for basic block
   drivers/infiniband/core/cm.c:3271:12: sparse: sparse: context imbalance in 'cm_lap_handler' - different lock contexts for basic block
   drivers/infiniband/core/cm.c:3360:12: sparse: sparse: context imbalance in 'cm_apr_handler' - different lock contexts for basic block
   drivers/infiniband/core/cm.c:3405:12: sparse: sparse: context imbalance in 'cm_timewait_handler' - different lock contexts for basic block

vim +/cm_queue_work_unlock +56 include/asm-generic/mmiowb.h

d1be6a28b13ce6d Will Deacon 2019-02-22  46  
d1be6a28b13ce6d Will Deacon 2019-02-22  47  static inline void mmiowb_spin_unlock(void)
d1be6a28b13ce6d Will Deacon 2019-02-22  48  {
d1be6a28b13ce6d Will Deacon 2019-02-22  49  	struct mmiowb_state *ms = __mmiowb_state();
d1be6a28b13ce6d Will Deacon 2019-02-22  50  
d1be6a28b13ce6d Will Deacon 2019-02-22  51  	if (unlikely(ms->mmiowb_pending)) {
d1be6a28b13ce6d Will Deacon 2019-02-22  52  		ms->mmiowb_pending = 0;
d1be6a28b13ce6d Will Deacon 2019-02-22  53  		mmiowb();
d1be6a28b13ce6d Will Deacon 2019-02-22  54  	}
d1be6a28b13ce6d Will Deacon 2019-02-22  55  
d1be6a28b13ce6d Will Deacon 2019-02-22 @56  	ms->nesting_count--;

:::::: The code at line 56 was first introduced by commit
:::::: d1be6a28b13ce6d1bc42bf9b6a9454c65839225b asm-generic/mmiowb: Add generic implementation of mmiowb() tracking

:::::: TO: Will Deacon <will.deacon@....com>
:::::: CC: Will Deacon <will.deacon@....com>

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

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