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Subjectinclude/linux/spinlock_api_smp.h:169:9: sparse: context imbalance in 'fixup_pi_state_owner' - unexpected unlock
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: bf5f89463f5b3109a72ed13ca62b57e90213387d
commit: 734009e96d1983ad739e5b656e03430b3660c913 futex: Change locking rules
date: 7 weeks ago
reproduce:
# apt-get install sparse
git checkout 734009e96d1983ad739e5b656e03430b3660c913
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

arch/x86/include/asm/futex.h:113:16: sparse: incorrect type in initializer (different address spaces)
arch/x86/include/asm/futex.h:113:16: expected unsigned int [noderef] [usertype] <asn:1>*__uval
arch/x86/include/asm/futex.h:113:16: got unsigned int [usertype] *uval
arch/x86/include/asm/futex.h:113:16: sparse: dereference of noderef expression
include/linux/list.h:78:19: sparse: context imbalance in 'wake_futex_pi' - unexpected unlock
kernel/futex.c:1573:33: sparse: context imbalance in 'futex_wake_op' - different lock contexts for basic block
kernel/futex.c:1855:41: sparse: context imbalance in 'futex_requeue' - different lock contexts for basic block
>> include/linux/spinlock_api_smp.h:169:9: sparse: context imbalance in 'fixup_pi_state_owner' - unexpected unlock
kernel/futex.c:2392:13: sparse: context imbalance in 'futex_wait_queue_me' - unexpected unlock
kernel/futex.c:2495:9: sparse: context imbalance in 'futex_wait_setup' - different lock contexts for basic block
kernel/futex.c:2805:22: sparse: context imbalance in 'futex_unlock_pi' - different lock contexts for basic block
kernel/futex.c:2965:29: sparse: context imbalance in 'futex_wait_requeue_pi' - unexpected unlock

vim +/fixup_pi_state_owner +169 include/linux/spinlock_api_smp.h

69d0ee73 Heiko Carstens 2009-08-31 153 }
69d0ee73 Heiko Carstens 2009-08-31 154
9c1721aa Thomas Gleixner 2009-12-03 155 static inline void __raw_spin_unlock_irqrestore(raw_spinlock_t *lock,
69d0ee73 Heiko Carstens 2009-08-31 156 unsigned long flags)
69d0ee73 Heiko Carstens 2009-08-31 157 {
69d0ee73 Heiko Carstens 2009-08-31 158 spin_release(&lock->dep_map, 1, _RET_IP_);
9828ea9d Thomas Gleixner 2009-12-03 159 do_raw_spin_unlock(lock);
69d0ee73 Heiko Carstens 2009-08-31 160 local_irq_restore(flags);
69d0ee73 Heiko Carstens 2009-08-31 161 preempt_enable();
69d0ee73 Heiko Carstens 2009-08-31 162 }
69d0ee73 Heiko Carstens 2009-08-31 163
9c1721aa Thomas Gleixner 2009-12-03 164 static inline void __raw_spin_unlock_irq(raw_spinlock_t *lock)
69d0ee73 Heiko Carstens 2009-08-31 165 {
69d0ee73 Heiko Carstens 2009-08-31 166 spin_release(&lock->dep_map, 1, _RET_IP_);
9828ea9d Thomas Gleixner 2009-12-03 167 do_raw_spin_unlock(lock);
69d0ee73 Heiko Carstens 2009-08-31 168 local_irq_enable();
69d0ee73 Heiko Carstens 2009-08-31 @169 preempt_enable();
69d0ee73 Heiko Carstens 2009-08-31 170 }
69d0ee73 Heiko Carstens 2009-08-31 171
9c1721aa Thomas Gleixner 2009-12-03 172 static inline void __raw_spin_unlock_bh(raw_spinlock_t *lock)
69d0ee73 Heiko Carstens 2009-08-31 173 {
69d0ee73 Heiko Carstens 2009-08-31 174 spin_release(&lock->dep_map, 1, _RET_IP_);
9828ea9d Thomas Gleixner 2009-12-03 175 do_raw_spin_unlock(lock);
9ea4c380 Peter Zijlstra 2013-11-19 176 __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
69d0ee73 Heiko Carstens 2009-08-31 177 }

:::::: The code at line 169 was first introduced by commit
:::::: 69d0ee7377eef808e34ba5542b554ec97244b871 locking: Move spinlock function bodies to header file

:::::: TO: Heiko Carstens <heiko.carstens@de.ibm.com>
:::::: CC: Ingo Molnar <mingo@elte.hu>

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation

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