From: kernel test robot <lkp@intel.com>
To: kbuild@lists.01.org
Subject: [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
Date: Fri, 13 Nov 2020 11:34:45 +0800 [thread overview]
Message-ID: <202011131140.Bnu39ewS-lkp@intel.com> (raw)
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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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