[hch-misc:follow_pte_pmd 2/2] include/linux/spinlock.h:394:9: sparse: sparse: context imbalance in 'follow_pfn' - unexpected unlock

[hch-misc:follow_pte_pmd 2/2] include/linux/spinlock.h:394:9: sparse: sparse: context imbalance in 'follow_pfn' - unexpected unlock

[kernel test robot]

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CC: kbuild-all(a)lists.01.org
TO: Christoph Hellwig <hch@lst.de>

tree:   git://git.infradead.org/users/hch/misc.git follow_pte_pmd
head:   664e96b63d9a79a1966138f586f97b1a670b3809
commit: 664e96b63d9a79a1966138f586f97b1a670b3809 [2/2] mm: simplify follow_pte{,pmd}
:::::: branch date: 7 hours ago
:::::: commit date: 7 hours ago
config: i386-randconfig-s002-20201029 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-56-gc09e8239-dirty
        git remote add hch-misc git://git.infradead.org/users/hch/misc.git
        git fetch --no-tags hch-misc follow_pte_pmd
        git checkout 664e96b63d9a79a1966138f586f97b1a670b3809
        # 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 >>)"
   mm/memory.c:5160:22: sparse: sparse: cast removes address space '__user' of expression
   mm/memory.c:943:17: sparse: sparse: context imbalance in 'copy_pte_range' - different lock contexts for basic block
   mm/memory.c:1612:16: sparse: sparse: context imbalance in '__get_locked_pte' - different lock contexts for basic block
   mm/memory.c:2163:17: sparse: sparse: context imbalance in 'remap_pte_range' - different lock contexts for basic block
   mm/memory.c: note: in included file (through include/linux/seqlock.h, include/linux/hrtimer.h, include/linux/interrupt.h, ...):
   include/linux/spinlock.h:394:9: sparse: sparse: context imbalance in 'apply_to_pte_range' - unexpected unlock
   mm/memory.c:2665:9: sparse: sparse: context imbalance in 'wp_page_copy' - different lock contexts for basic block
   include/linux/spinlock.h:394:9: sparse: sparse: context imbalance in 'wp_pfn_shared' - unexpected unlock
   mm/memory.c:3072:19: sparse: sparse: context imbalance in 'do_wp_page' - different lock contexts for basic block
   mm/memory.c:3644:19: sparse: sparse: context imbalance in 'pte_alloc_one_map' - different lock contexts for basic block
   include/linux/spinlock.h:394:9: sparse: sparse: context imbalance in 'finish_fault' - unexpected unlock
   include/linux/spinlock.h:394:9: sparse: sparse: context imbalance in 'do_fault_around' - unexpected unlock
   mm/memory.c:4699:5: sparse: sparse: context imbalance in 'follow_pte' - different lock contexts for basic block
>> include/linux/spinlock.h:394:9: sparse: sparse: context imbalance in 'follow_pfn' - unexpected unlock
>> include/linux/spinlock.h:394:9: sparse: sparse: context imbalance in 'follow_phys' - unexpected unlock

vim +/follow_pfn +394 include/linux/spinlock.h

c2f21ce2e31286a Thomas Gleixner 2009-12-02  391  
3490565b633c705 Denys Vlasenko  2015-07-13  392  static __always_inline void spin_unlock(spinlock_t *lock)
c2f21ce2e31286a Thomas Gleixner 2009-12-02  393  {
c2f21ce2e31286a Thomas Gleixner 2009-12-02 @394  	raw_spin_unlock(&lock->rlock);
c2f21ce2e31286a Thomas Gleixner 2009-12-02  395  }
c2f21ce2e31286a Thomas Gleixner 2009-12-02  396  

:::::: The code at line 394 was first introduced by commit
:::::: c2f21ce2e31286a0a32f8da0a7856e9ca1122ef3 locking: Implement new raw_spinlock

:::::: TO: Thomas Gleixner <tglx@linutronix.de>
:::::: CC: Thomas Gleixner <tglx@linutronix.de>

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

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