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-rw-r--r--include/linux/huge_mm.h17
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 */