diff --git a/tools/testing/cxl/Kbuild b/tools/testing/cxl/Kbuild
index b1256fee3567fc..ed9f50dee3f55a 100644
--- a/tools/testing/cxl/Kbuild
+++ b/tools/testing/cxl/Kbuild
@@ -15,6 +15,7 @@ ldflags-y += --wrap=devm_cxl_add_rch_dport
 ldflags-y += --wrap=cxl_rcd_component_reg_phys
 ldflags-y += --wrap=cxl_endpoint_parse_cdat
 ldflags-y += --wrap=cxl_dport_init_ras_reporting
+ldflags-y += --wrap=cxl_region_shared_upstream_bandwidth_update
 
 DRIVERS := ../../../drivers
 CXL_SRC := $(DRIVERS)/cxl
@@ -61,6 +62,7 @@ cxl_core-y += $(CXL_CORE_SRC)/pci.o
 cxl_core-y += $(CXL_CORE_SRC)/hdm.o
 cxl_core-y += $(CXL_CORE_SRC)/pmu.o
 cxl_core-y += $(CXL_CORE_SRC)/cdat.o
+cxl_core-y += mock_cdat.o
 cxl_core-$(CONFIG_TRACING) += $(CXL_CORE_SRC)/trace.o
 cxl_core-$(CONFIG_CXL_REGION) += $(CXL_CORE_SRC)/region.o
 cxl_core-y += config_check.o
diff --git a/tools/testing/cxl/mock_cdat.c b/tools/testing/cxl/mock_cdat.c
new file mode 100644
index 00000000000000..99974153b3f68e
--- /dev/null
+++ b/tools/testing/cxl/mock_cdat.c
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2024 FUJITSU LIMITED. All rights reserved. */
+
+#include <cxl.h>
+
+void __wrap_cxl_region_shared_upstream_bandwidth_update(struct cxl_region *cxlr)
+{
+}