diff --git a/scst/include/backport.h b/scst/include/backport.h
index 7de532cf6..15b4bd634 100644
--- a/scst/include/backport.h
+++ b/scst/include/backport.h
@@ -90,16 +90,6 @@ static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
 }
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 17, 0)
-static inline void blk_queue_flag_set(unsigned int flag,
-				      struct request_queue *q)
-{
-#if !defined(RHEL_MAJOR) || RHEL_MAJOR -0 >= 6
-	queue_flag_set_unlocked(flag, q);
-#endif
-}
-#endif
-
 /* <linux/compiler.h> */
 
 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 20)
diff --git a/scst/include/scst.h b/scst/include/scst.h
index 7a43769db..0a500aa91 100644
--- a/scst/include/scst.h
+++ b/scst/include/scst.h
@@ -4975,7 +4975,7 @@ static inline struct scatterlist *sg_next_inline(struct scatterlist *sg)
 static inline void sg_clear(struct scatterlist *sg)
 {
 	memset(sg, 0, sizeof(*sg));
-#ifdef CONFIG_DEBUG_SG
+#if 0 // def CONFIG_DEBUG_SG
 	sg->sg_magic = SG_MAGIC;
 #endif
 }
diff --git a/scst_local/scst_local.c b/scst_local/scst_local.c
index 5fbf98d49..45a9f03cc 100644
--- a/scst_local/scst_local.c
+++ b/scst_local/scst_local.c
@@ -1230,7 +1230,14 @@ static int scst_local_change_queue_depth(struct scsi_device *sdev, int qdepth)
 
 static int scst_local_slave_alloc(struct scsi_device *sdev)
 {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 17, 0)
+#if !defined(RHEL_MAJOR) || RHEL_MAJOR -0 >= 6
+	queue_flag_set_unlocked(QUEUE_FLAG_BIDI, sdev->request_queue);
+#endif
+#else
 	blk_queue_flag_set(QUEUE_FLAG_BIDI, sdev->request_queue);
+#endif
+
 	return 0;
 }