1 files changed, 3 insertions, 0 deletions
diff --git a/mm/vma.h b/mm/vma.h
index abada6a64c4e..9d5ee6ac913a 100644
--- a/mm/vma.h
+++ b/mm/vma.h
@@ -106,6 +106,9 @@ struct vma_merge_struct {
 	struct anon_vma_name *anon_name;
 	enum vma_merge_state state;
 
+	/* If copied from (i.e. mremap()'d) the VMA from which we are copying. */
+	struct vm_area_struct *copied_from;
+
 	/* Flags which callers can use to modify merge behaviour: */
 
 	/*