diff --git a/include/linux/mm.h b/include/linux/mm.h
index 4023629..ffee2f7 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -132,6 +132,11 @@
 #define VM_RandomReadHint(v)		((v)->vm_flags & VM_RAND_READ)
 
 /*
+ * special vmas that are non-mergable, non-mlock()able
+ */
+#define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP)
+
+/*
  * mapping from the currently active vm_flags protection bits (the
  * low four bits) to a page protection mask..
  */