[linux-stable-rc:linux-5.4.y 2735/3216] include/asm-generic/qspinlock.h:94:9: sparse: sparse: context imbalance in 'pull_rt_task' - unexpected unlock

[linux-stable-rc:linux-5.4.y 2735/3216] include/asm-generic/qspinlock.h:94:9: sparse: sparse: context imbalance in 'pull_rt_task' - unexpected unlock

[kernel test robot]

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CC: kbuild-all(a)lists.01.org
TO: Juri Lelli <juri.lelli@redhat.com>
CC: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>
CC: Daniel Bristot de Oliveira <bristot@redhat.com>
CC: Ingo Molnar <mingo@kernel.org>
CC: Valentin Schneider <valentin.schneider@arm.com>
CC: Sasha Levin <alexander.levin@microsoft.com>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.4.y
head:   28fe0e171c2042692c2cf71df3e8cb4ad78d40da
commit: 78e27678db4ea62377425df497c7421359888b1a [2735/3216] sched/features: Fix !CONFIG_JUMP_LABEL case
:::::: branch date: 33 hours ago
:::::: commit date: 2 weeks ago
config: i386-randconfig-s002-20201113 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-107-gaf3512a6-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=78e27678db4ea62377425df497c7421359888b1a
        git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
        git fetch --no-tags linux-stable-rc linux-5.4.y
        git checkout 78e27678db4ea62377425df497c7421359888b1a
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

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 >>)"
   kernel/sched/rt.c:1673:9: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct sched_domain *[assigned] sd @@     got struct sched_domain [noderef] <asn:4> *parent @@
   kernel/sched/rt.c:1673:9: sparse:     expected struct sched_domain *[assigned] sd
   kernel/sched/rt.c:1673:9: sparse:     got struct sched_domain [noderef] <asn:4> *parent
   kernel/sched/rt.c: note: in included file (through arch/x86/include/asm/qspinlock.h, arch/x86/include/asm/spinlock.h, include/linux/spinlock.h, ...):
   include/asm-generic/qspinlock.h:94:9: sparse: sparse: context imbalance in 'find_lock_lowest_rq' - unexpected unlock
   kernel/sched/rt.c:1859:9: sparse: sparse: context imbalance in 'push_rt_task' - unexpected unlock
>> include/asm-generic/qspinlock.h:94:9: sparse: sparse: context imbalance in 'pull_rt_task' - unexpected unlock

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

a33fda35e3a7655 Waiman Long 2015-04-24  83  
a33fda35e3a7655 Waiman Long 2015-04-24  84  #ifndef queued_spin_unlock
a33fda35e3a7655 Waiman Long 2015-04-24  85  /**
a33fda35e3a7655 Waiman Long 2015-04-24  86   * queued_spin_unlock - release a queued spinlock
a33fda35e3a7655 Waiman Long 2015-04-24  87   * @lock : Pointer to queued spinlock structure
a33fda35e3a7655 Waiman Long 2015-04-24  88   */
a33fda35e3a7655 Waiman Long 2015-04-24  89  static __always_inline void queued_spin_unlock(struct qspinlock *lock)
a33fda35e3a7655 Waiman Long 2015-04-24  90  {
a33fda35e3a7655 Waiman Long 2015-04-24  91  	/*
ca50e426f96c905 Pan Xinhui  2016-06-03  92  	 * unlock() needs release semantics:
a33fda35e3a7655 Waiman Long 2015-04-24  93  	 */
626e5fbc1435890 Will Deacon 2018-04-26 @94  	smp_store_release(&lock->locked, 0);
a33fda35e3a7655 Waiman Long 2015-04-24  95  }
a33fda35e3a7655 Waiman Long 2015-04-24  96  #endif
a33fda35e3a7655 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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