fix
diff --git a/kernel/inode.c b/kernel/inode.c
index 8227be8..525a5b6 100644
--- a/kernel/inode.c
+++ b/kernel/inode.c
@@ -487,7 +487,7 @@
 			}
 			list_add(&req->list, &fc->unused_list);
 		}
-#ifdef KERNEL_2_6
+#ifdef KERNEL_2_6_6_PLUS
 		fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
 		fc->bdi.unplug_io_fn = default_unplug_io_fn;
 #endif