[mmotm:master 260/385] include/linux/mmu_notifier.h:247:19: sparse: context imbalance in 'kpageidle_clear_pte_refs_one' - unexpected unlock

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tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   61f5f835b6f06fbc233481b5d3c0afd71ecf54e8
commit: a06e045a2c99e39bf342ccb5dbbd6655f3814238 [260/385] proc: add kpageidle file
reproduce:
  # apt-get install sparse
  git checkout a06e045a2c99e39bf342ccb5dbbd6655f3814238
  make ARCH=x86_64 allmodconfig
  make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> include/linux/mmu_notifier.h:247:19: sparse: context imbalance in 'kpageidle_clear_pte_refs_one' - unexpected unlock

vim +/kpageidle_clear_pte_refs_one +247 include/linux/mmu_notifier.h

cddb8a5c Andrea Arcangeli     2008-07-28  231  
cddb8a5c Andrea Arcangeli     2008-07-28  232  static inline void mmu_notifier_release(struct mm_struct *mm)
cddb8a5c Andrea Arcangeli     2008-07-28  233  {
cddb8a5c Andrea Arcangeli     2008-07-28  234  	if (mm_has_notifiers(mm))
cddb8a5c Andrea Arcangeli     2008-07-28  235  		__mmu_notifier_release(mm);
cddb8a5c Andrea Arcangeli     2008-07-28  236  }
cddb8a5c Andrea Arcangeli     2008-07-28  237  
cddb8a5c Andrea Arcangeli     2008-07-28  238  static inline int mmu_notifier_clear_flush_young(struct mm_struct *mm,
57128468 Andres Lagar-Cavilla 2014-09-22  239  					  unsigned long start,
57128468 Andres Lagar-Cavilla 2014-09-22  240  					  unsigned long end)
cddb8a5c Andrea Arcangeli     2008-07-28  241  {
cddb8a5c Andrea Arcangeli     2008-07-28  242  	if (mm_has_notifiers(mm))
57128468 Andres Lagar-Cavilla 2014-09-22  243  		return __mmu_notifier_clear_flush_young(mm, start, end);
cddb8a5c Andrea Arcangeli     2008-07-28  244  	return 0;
cddb8a5c Andrea Arcangeli     2008-07-28  245  }
cddb8a5c Andrea Arcangeli     2008-07-28  246  
59eaee21 Vladimir Davydov     2015-07-23 @247  static inline int mmu_notifier_clear_young(struct mm_struct *mm,
59eaee21 Vladimir Davydov     2015-07-23  248  					   unsigned long start,
59eaee21 Vladimir Davydov     2015-07-23  249  					   unsigned long end)
59eaee21 Vladimir Davydov     2015-07-23  250  {
59eaee21 Vladimir Davydov     2015-07-23  251  	if (mm_has_notifiers(mm))
59eaee21 Vladimir Davydov     2015-07-23  252  		return __mmu_notifier_clear_young(mm, start, end);
59eaee21 Vladimir Davydov     2015-07-23  253  	return 0;
59eaee21 Vladimir Davydov     2015-07-23  254  }
59eaee21 Vladimir Davydov     2015-07-23  255  

:::::: The code at line 247 was first introduced by commit
:::::: 59eaee21bfc9e38e75a18a8c28cc145f21be7314 mmu-notifier: add clear_young callback

:::::: TO: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
:::::: CC: Johannes Weiner <hannes@xxxxxxxxxxx>

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

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