diff --git a/scst/kernel/in-tree/Kconfig.scst b/scst/kernel/in-tree/Kconfig.scst
index eec60baef..f92297885 100644
--- a/scst/kernel/in-tree/Kconfig.scst
+++ b/scst/kernel/in-tree/Kconfig.scst
@@ -65,6 +65,16 @@ config SCST_VDISK
 	help
 	  SCST device handler for virtual disk and/or CDROM device.
 
+config SCST_USER
+	tristate "User-space SCSI target driver support"
+	default SCST
+	depends on SCSI && SCST && !HIGHMEM4G && !HIGHMEM64G
+	help
+	  The SCST device handler scst_user allows to implement full-feature
+          SCSI target devices in user space.
+
+	  If unsure, say "N".
+
 config SCST_STRICT_SERIALIZING
 	bool "Strict serialization"
 	depends on SCST
diff --git a/scst/src/dev_handlers/scst_user.c b/scst/src/dev_handlers/scst_user.c
index 2b281d95c..f898b4221 100644
--- a/scst/src/dev_handlers/scst_user.c
+++ b/scst/src/dev_handlers/scst_user.c
@@ -34,12 +34,14 @@
 #endif
 #include "scst_dev_handler.h"
 
+#ifndef INSIDE_KERNEL_TREE
 #if defined(CONFIG_HIGHMEM4G) || defined(CONFIG_HIGHMEM64G)
 #warning "HIGHMEM kernel configurations are not supported by this module,\
  because nowadays it doesn't worth the effort. Consider changing\
  VMSPLIT option or use a 64-bit configuration instead. See README file\
  for details."
 #endif
+#endif
 
 #define DEV_USER_CMD_HASH_ORDER		6
 #define DEV_USER_ATTACH_TIMEOUT		(5*HZ)
@@ -3721,12 +3723,14 @@ static int __init init_scst_user(void)
 
 	TRACE_ENTRY();
 
+#ifndef INSIDE_KERNEL_TREE
 #if defined(CONFIG_HIGHMEM4G) || defined(CONFIG_HIGHMEM64G)
 	PRINT_ERROR("%s", "HIGHMEM kernel configurations are not supported. "
 		"Consider changing VMSPLIT option or use a 64-bit "
 		"configuration instead. See README file for details.");
 	res = -EINVAL;
 	goto out;
+#endif
 #endif
 
 	user_cmd_cachep = KMEM_CACHE(scst_user_cmd, SCST_SLAB_FLAGS);