TESTMODS_DIR := $(realpath $(dir $(abspath $(lastword $(MAKEFILE_LIST)))))KDIR ?= /lib/modules/$(shell uname -r)/build obj-m += test_klp_atomic_replace.o \	test_klp_callbacks_busy.o \	test_klp_callbacks_demo.o \	test_klp_callbacks_demo2.o \	test_klp_callbacks_mod.o \	test_klp_livepatch.o \	test_klp_state.o \	test_klp_state2.o \	test_klp_state3.o \	test_klp_shadow_vars.o \	test_klp_syscall.o # Ensure that KDIR exists, otherwise skip the compilationmodules:ifneq ("$(wildcard $(KDIR))", "")	$(Q)$(MAKE) -C $(KDIR) modules KBUILD_EXTMOD=$(TESTMODS_DIR)endif # Ensure that KDIR exists, otherwise skip the clean targetclean:ifneq ("$(wildcard $(KDIR))", "")	$(Q)$(MAKE) -C $(KDIR) clean KBUILD_EXTMOD=$(TESTMODS_DIR)endif