diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/huge_mm.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 1b921299abc4..f56cacb4fec3 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -113,6 +113,18 @@ extern void __vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start, unsigned long end, long adjust_next); +extern int __pmd_trans_huge_lock(pmd_t *pmd, + struct vm_area_struct *vma); +/* mmap_sem must be held on entry */ +static inline int pmd_trans_huge_lock(pmd_t *pmd, + struct vm_area_struct *vma) +{ + VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem)); + if (pmd_trans_huge(*pmd)) + return __pmd_trans_huge_lock(pmd, vma); + else + return 0; +} static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start, unsigned long end, @@ -176,6 +188,11 @@ static inline void vma_adjust_trans_huge(struct vm_area_struct *vma, long adjust_next) { } +static inline int pmd_trans_huge_lock(pmd_t *pmd, + struct vm_area_struct *vma) +{ + return 0; +} #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ #endif /* _LINUX_HUGE_MM_H */ |