diff --git a/scst/include/scst.h b/scst/include/scst.h
index 655e155e8..1d7ca69b1 100644
--- a/scst/include/scst.h
+++ b/scst/include/scst.h
@@ -92,6 +92,12 @@ typedef _Bool bool;
 #include "scst_sgv.h"
 #endif
 
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 20)
+#ifndef __printf
+#define __printf(a, b) __attribute__((format(printf,a,b)))
+#endif
+#endif
+
 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 20) && !defined(BACKPORT_LINUX_CPUMASK_H)
 #define nr_cpu_ids NR_CPUS
 #endif
@@ -3787,6 +3793,8 @@ static inline struct scatterlist *sg_chain_ptr(struct scatterlist *sg)
 	return NULL;
 }
 
+#define sg_is_last(sg) false
+
 #ifndef sg_page
 static inline struct page *sg_page(struct scatterlist *sg)
 {
diff --git a/scst/src/dev_handlers/scst_vdisk.c b/scst/src/dev_handlers/scst_vdisk.c
index 6420801d8..5bb919a15 100644
--- a/scst/src/dev_handlers/scst_vdisk.c
+++ b/scst/src/dev_handlers/scst_vdisk.c
@@ -2134,8 +2134,8 @@ static int vdisk_unmap_range(struct scst_cmd *cmd,
 		(unsigned long long)start_lba, (unsigned long long)blocks);
 
 	if (virt_dev->blockio) {
-		struct inode *inode = fd->f_dentry->d_inode;
 #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27)
+		struct inode *inode = fd->f_dentry->d_inode;
 		gfp_t gfp = scst_cmd_get_gfp_flags(cmd);
 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 31)
 		err = blkdev_issue_discard(inode->i_bdev, start_lba, blocks, gfp);