[linux-next:master 3648/5403] include/asm-generic/qspinlock.h:94:9: sparse: sparse: context imbalance in 'tcf_qevent_handle' - unexpected unlock

[linux-next:master 3648/5403] include/asm-generic/qspinlock.h:94:9: sparse: sparse: context imbalance in 'tcf_qevent_handle' - unexpected unlock

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   9e50b94b3eb0d859a2586b5a40d7fd6e5afd9210
commit: 3625750f05ecce21a0fce429c1ff85acfffb461b [3648/5403] net: sched: Introduce helpers for qevent blocks
config: x86_64-randconfig-s021-20200704 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-3-gfa153962-dirty
        git checkout 3625750f05ecce21a0fce429c1ff85acfffb461b
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

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 >>)

   net/sched/cls_api.c:270:22: sparse: sparse: incorrect type in assignment (different base types) @@     expected restricted __be16 [usertype] protocol @@     got unsigned int [usertype] protocol @@
   net/sched/cls_api.c:270:22: sparse:     expected restricted __be16 [usertype] protocol
   net/sched/cls_api.c:270:22: sparse:     got unsigned int [usertype] protocol
   net/sched/cls_api.c:1672:16: sparse: sparse: incompatible types in comparison expression (different address spaces):
   net/sched/cls_api.c:1672:16: sparse:    struct tcf_proto *
   net/sched/cls_api.c:1672:16: sparse:    struct tcf_proto [noderef] __rcu *
   net/sched/cls_api.c:1772:20: sparse: sparse: incompatible types in comparison expression (different address spaces):
   net/sched/cls_api.c:1772:20: sparse:    struct tcf_proto [noderef] __rcu *
   net/sched/cls_api.c:1772:20: sparse:    struct tcf_proto *
   net/sched/cls_api.c:1734:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   net/sched/cls_api.c:1734:25: sparse:    struct tcf_proto [noderef] __rcu *
   net/sched/cls_api.c:1734:25: sparse:    struct tcf_proto *
   net/sched/cls_api.c:1754:16: sparse: sparse: incompatible types in comparison expression (different address spaces):
   net/sched/cls_api.c:1754:16: sparse:    struct tcf_proto *
   net/sched/cls_api.c:1754:16: sparse:    struct tcf_proto [noderef] __rcu *
   net/sched/cls_api.c:1819:25: sparse: sparse: restricted __be16 degrades to integer
   net/sched/cls_api.c:2494:50: sparse: sparse: restricted __be16 degrades to integer
   net/sched/cls_api.c:3725:9: sparse: sparse: context imbalance in 'tc_setup_flow_action' - different lock contexts for basic block
>> include/asm-generic/qspinlock.h:94:9: sparse: sparse: context imbalance in 'tcf_qevent_handle' - unexpected unlock

vim +/tcf_qevent_handle +94 include/asm-generic/qspinlock.h

a33fda35e3a765 Waiman Long 2015-04-24  83  
a33fda35e3a765 Waiman Long 2015-04-24  84  #ifndef queued_spin_unlock
a33fda35e3a765 Waiman Long 2015-04-24  85  /**
a33fda35e3a765 Waiman Long 2015-04-24  86   * queued_spin_unlock - release a queued spinlock
a33fda35e3a765 Waiman Long 2015-04-24  87   * @lock : Pointer to queued spinlock structure
a33fda35e3a765 Waiman Long 2015-04-24  88   */
a33fda35e3a765 Waiman Long 2015-04-24  89  static __always_inline void queued_spin_unlock(struct qspinlock *lock)
a33fda35e3a765 Waiman Long 2015-04-24  90  {
a33fda35e3a765 Waiman Long 2015-04-24  91  	/*
ca50e426f96c90 Pan Xinhui  2016-06-03  92  	 * unlock() needs release semantics:
a33fda35e3a765 Waiman Long 2015-04-24  93  	 */
626e5fbc143589 Will Deacon 2018-04-26 @94  	smp_store_release(&lock->locked, 0);
a33fda35e3a765 Waiman Long 2015-04-24  95  }
a33fda35e3a765 Waiman Long 2015-04-24  96  #endif
a33fda35e3a765 Waiman Long 2015-04-24  97  

:::::: The code at line 94 was first introduced by commit
:::::: 626e5fbc14358901ddaa90ce510e0fbeab310432 locking/qspinlock: Use smp_store_release() in queued_spin_unlock()

:::::: TO: Will Deacon <will.deacon@arm.com>
:::::: CC: Ingo Molnar <mingo@kernel.org>

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

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