diff -Naur drbd-9.0.2+git.14d2eea.orig/drbd/drbd-kernel-compat/drbd_wrappers.h drbd-9.0.2+git.14d2eea/drbd/drbd-kernel-compat/drbd_wrappers.h
--- drbd-9.0.2+git.14d2eea.orig/drbd/drbd-kernel-compat/drbd_wrappers.h	2016-06-08 17:52:23.920376490 +0800
+++ drbd-9.0.2+git.14d2eea/drbd/drbd-kernel-compat/drbd_wrappers.h	2016-06-08 21:14:33.692708703 +0800
@@ -677,6 +677,10 @@
 #define blk_queue_max_hw_sectors(q, max)	blk_queue_max_sectors(q, max)
 #endif
 
+#ifndef COMPAT_HAVE_BLK_QUEUE_FLUSH
+#define blk_queue_flush(q, f)	blk_queue_write_cache(q, true, true)
+#endif
+
 #ifndef COMPAT_HAVE_BLK_QUEUE_MAX_SEGMENTS
 static inline void blk_queue_max_segments(struct request_queue *q, unsigned short max_segments)
 {
diff -Naur drbd-9.0.2+git.14d2eea.orig/drbd/drbd-kernel-compat/tests/have_blk_queue_flush.c drbd-9.0.2+git.14d2eea/drbd/drbd-kernel-compat/tests/have_blk_queue_flush.c
--- drbd-9.0.2+git.14d2eea.orig/drbd/drbd-kernel-compat/tests/have_blk_queue_flush.c	1970-01-01 08:00:00.000000000 +0800
+++ drbd-9.0.2+git.14d2eea/drbd/drbd-kernel-compat/tests/have_blk_queue_flush.c	2016-06-08 21:13:40.324918430 +0800
@@ -0,0 +1,6 @@
+#include <linux/blkdev.h>
+
+void dummy(struct request_queue *q, unsigned int flush)
+{
+	blk_queue_flush(q, flush);
+}