1 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5568553a41fd..6eba2cc016c9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1482,6 +1482,18 @@ static inline unsigned long vma_pages(struct vm_area_struct *vma)
         return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
 }
 
+/* Look up the first VMA which exactly match the interval vm_start ... vm_end */
+static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
+                                unsigned long vm_start, unsigned long vm_end)
+{
+        struct vm_area_struct *vma = find_vma(mm, vm_start);
+
+        if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))
+                vma = NULL;
+
+        return vma;
+}
+
 #ifdef CONFIG_MMU
 pgprot_t vm_get_page_prot(unsigned long vm_flags);
 #else