linux-kernel - arch/x86/include/asm/qspinlock.h:17:9: sparse: context imbalance in 'fsnotify_add_mark_list'

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Date:   Wed, 10 May 2017 04:01:17 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Jan Kara <jack@...e.cz>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Miklos Szeredi <mszeredi@...hat.com>,
        Amir Goldstein <amir73il@...il.com>
Subject: arch/x86/include/asm/qspinlock.h:17:9: sparse: context imbalance in
 'fsnotify_add_mark_list' - unexpected unlock

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   4a1e31c68e9f40be32838944931178b0d9ed9162
commit: 08991e83b7286635167bab40927665a90fb00d81 fsnotify: Free fsnotify_mark_connector when there is no mark attached
date:   4 weeks ago
reproduce:
        # apt-get install sparse
        git checkout 08991e83b7286635167bab40927665a90fb00d81
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

   fs/notify/mark.c:88:19: sparse: symbol 'fsnotify_mark_connector_cachep' was not declared. Should it be static?
   fs/notify/mark.c:406:39: sparse: context imbalance in 'fsnotify_grab_connector' - wrong count at exit
>> arch/x86/include/asm/qspinlock.h:17:9: sparse: context imbalance in 'fsnotify_add_mark_list' - unexpected unlock
   fs/notify/mark.c:534:9: sparse: context imbalance in 'fsnotify_add_mark_locked' - unexpected unlock
   fs/notify/mark.c:578:25: sparse: context imbalance in 'fsnotify_find_mark' - unexpected unlock
   fs/notify/mark.c:667:24: sparse: context imbalance in 'fsnotify_destroy_marks' - unexpected unlock

vim +/fsnotify_add_mark_list +17 arch/x86/include/asm/qspinlock.h

d73a3397 Waiman Long            2015-04-24   1  #ifndef _ASM_X86_QSPINLOCK_H
d73a3397 Waiman Long            2015-04-24   2  #define _ASM_X86_QSPINLOCK_H
d73a3397 Waiman Long            2015-04-24   3  
2aa79af6 Peter Zijlstra (Intel  2015-04-24   4) #include <asm/cpufeature.h>
d73a3397 Waiman Long            2015-04-24   5  #include <asm-generic/qspinlock_types.h>
f233f7f1 Peter Zijlstra (Intel  2015-04-24   6) #include <asm/paravirt.h>
d73a3397 Waiman Long            2015-04-24   7  
d73a3397 Waiman Long            2015-04-24   8  #define	queued_spin_unlock queued_spin_unlock
d73a3397 Waiman Long            2015-04-24   9  /**
d73a3397 Waiman Long            2015-04-24  10   * queued_spin_unlock - release a queued spinlock
d73a3397 Waiman Long            2015-04-24  11   * @lock : Pointer to queued spinlock structure
d73a3397 Waiman Long            2015-04-24  12   *
d73a3397 Waiman Long            2015-04-24  13   * A smp_store_release() on the least-significant byte.
d73a3397 Waiman Long            2015-04-24  14   */
f233f7f1 Peter Zijlstra (Intel  2015-04-24  15) static inline void native_queued_spin_unlock(struct qspinlock *lock)
d73a3397 Waiman Long            2015-04-24  16  {
d73a3397 Waiman Long            2015-04-24 @17  	smp_store_release((u8 *)lock, 0);
d73a3397 Waiman Long            2015-04-24  18  }
d73a3397 Waiman Long            2015-04-24  19  
f233f7f1 Peter Zijlstra (Intel  2015-04-24  20) #ifdef CONFIG_PARAVIRT_SPINLOCKS
f233f7f1 Peter Zijlstra (Intel  2015-04-24  21) extern void native_queued_spin_lock_slowpath(struct qspinlock *lock, u32 val);
f233f7f1 Peter Zijlstra (Intel  2015-04-24  22) extern void __pv_init_lock_hash(void);
f233f7f1 Peter Zijlstra (Intel  2015-04-24  23) extern void __pv_queued_spin_lock_slowpath(struct qspinlock *lock, u32 val);
f233f7f1 Peter Zijlstra (Intel  2015-04-24  24) extern void __raw_callee_save___pv_queued_spin_unlock(struct qspinlock *lock);
f233f7f1 Peter Zijlstra (Intel  2015-04-24  25) 

:::::: The code at line 17 was first introduced by commit
:::::: d73a33973f16ab6703e75ea00edee857afa3406e locking/qspinlock, x86: Enable x86-64 to use queued spinlocks

:::::: TO: Waiman Long <Waiman.Long@...com>
:::::: CC: Ingo Molnar <mingo@...nel.org>

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