tree: git://git.cmpxchg.org/linux-mmotm.git master
head: 4ddd4bc6e081ef29f7adaacb357b77052fefcd7e
commit: 6a9ad050c521ac607a30a691042f2a5d24109b07 [463/499] percpu: add raw_cpu_ops
reproduce: make C=1 CF=-D__CHECK_ENDIAN__
sparse warnings: (new ones prefixed by >>)
>> mm/mprotect.c:46:14: sparse: context imbalance in 'lock_pte_protection' - different lock contexts for basic block
>> arch/x86/include/asm/paravirt.h:699:9: sparse: context imbalance in 'change_pte_range' - unexpected unlock
--
>> fs/ntfs/super.c:3100:1: sparse: directive in argument list
>> fs/ntfs/super.c:3102:1: sparse: directive in argument list
>> fs/ntfs/super.c:3104:1: sparse: directive in argument list
>> fs/ntfs/super.c:3105:1: sparse: directive in argument list
>> fs/ntfs/super.c:3107:1: sparse: directive in argument list
>> fs/ntfs/super.c:3108:1: sparse: directive in argument list
>> fs/ntfs/super.c:3110:1: sparse: directive in argument list
vim +/lock_pte_protection +46 mm/mprotect.c
^1da177e Linus Torvalds 2005-04-16 30 #include <asm/tlbflush.h>
^1da177e Linus Torvalds 2005-04-16 31
1c12c4cf Venki Pallipadi 2008-05-14 32 #ifndef pgprot_modify
1c12c4cf Venki Pallipadi 2008-05-14 33 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
1c12c4cf Venki Pallipadi 2008-05-14 34 {
1c12c4cf Venki Pallipadi 2008-05-14 35 return newprot;
1c12c4cf Venki Pallipadi 2008-05-14 36 }
1c12c4cf Venki Pallipadi 2008-05-14 37 #endif
1c12c4cf Venki Pallipadi 2008-05-14 38
af79e8ed Mel Gorman 2014-03-22 39 /*
af79e8ed Mel Gorman 2014-03-22 40 * For a prot_numa update we only hold mmap_sem for read so there is a
af79e8ed Mel Gorman 2014-03-22 41 * potential race with faulting where a pmd was temporarily none. This
af79e8ed Mel Gorman 2014-03-22 42 * function checks for a transhuge pmd under the appropriate lock. It
af79e8ed Mel Gorman 2014-03-22 43 * returns a pte if it was successfully locked or NULL if it raced with
af79e8ed Mel Gorman 2014-03-22 44 * a transhuge insertion.
af79e8ed Mel Gorman 2014-03-22 45 */
af79e8ed Mel Gorman 2014-03-22 @46 static pte_t *lock_pte_protection(struct vm_area_struct *vma, pmd_t *pmd,
af79e8ed Mel Gorman 2014-03-22 47 unsigned long addr, int prot_numa, spinlock_t **ptl)
af79e8ed Mel Gorman 2014-03-22 48 {
af79e8ed Mel Gorman 2014-03-22 49 pte_t *pte;
af79e8ed Mel Gorman 2014-03-22 50 spinlock_t *pmdl;
af79e8ed Mel Gorman 2014-03-22 51
af79e8ed Mel Gorman 2014-03-22 52 /* !prot_numa is protected by mmap_sem held for write */
af79e8ed Mel Gorman 2014-03-22 53 if (!prot_numa)
af79e8ed Mel Gorman 2014-03-22 54 return pte_offset_map_lock(vma->vm_mm, pmd, addr, ptl);
:::::: The code at line 46 was first introduced by commit
:::::: af79e8edd17efee942ddfd277d0b3e8fc1ea7fe1 mm-numa-recheck-for-transhuge-pages-under-lock-during-protection-changes-fix
:::::: TO: Mel Gorman <mgorman@xxxxxxx>
:::::: CC: Johannes Weiner <hannes@xxxxxxxxxxx>
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