+#define IS_MNT_UNION(x) (0)
+#define is_unionized(x, y) (0)
+#define append_to_union(x1, y1, x2, y2) ({ BUG(); (0); })
-+#define follow_union_down(x, y) ({ (0); })
-+#define follow_union_mount(x, y) ({ (0); })
++#define follow_union_down(x) ({ (0); })
++#define follow_union_mount(x) ({ (0); })
+#define __d_drop_unions(x) do { } while (0)
+#define shrink_d_unions(x) do { } while (0)
+#define __shrink_d_unions(x,y) do { } while (0)
--- /dev/null
+--- a/include/linux/union.h
++++ b/include/linux/union.h
+@@ -77,7 +77,7 @@
+ #define __union_copyup(x, y, z) ({ BUG(); (0); })
+ #define union_copyup(x, y) ({ (0); })
+ #define union_copyup_dir(x) ({ BUG(); (0); })
+-#define union_permission(x, y) inode_permission(x->dentry->d_inode, y)
++#define union_permission(x, y) inode_permission((x)->dentry->d_inode, y)
+
+ #endif /* CONFIG_UNION_MOUNT */
+ #endif /* __KERNEL__ */