diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h
index 6a51619..c31d2c2 100644
--- a/fs/xfs/xfs_linux.h
+++ b/fs/xfs/xfs_linux.h
@@ -384,4 +384,10 @@
 #endif /* XFS_WARN */
 #endif /* DEBUG */
 
+#ifdef CONFIG_XFS_RT
+#define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)
+#else
+#define XFS_IS_REALTIME_INODE(ip) (0)
+#endif
+
 #endif /* __XFS_LINUX__ */