enable kunit to call agnocast function

kmod/Makefile

@@ -1,11 +1,11 @@
 obj-m := agnocast.o
 CFLAGS_agnocast.o := -Wall -Werror
+CFLAGS_agnocast_kunit.o := -Wall -Werror
 
 KERNEL_VERSION := $(shell uname -r)
 KERNEL_MAJOR := $(shell echo $(KERNEL_VERSION) | cut -d '.' -f 1)
 KERNEL_MINOR := $(shell echo $(KERNEL_VERSION) | cut -d '.' -f 2)
 
-
 # In Linux kernel v5.17 and earlier, the top-level Linux Makefile specifies -std=gnu89,
 # so it is necessary to declare the variable used as the iterator in the for loop beforehand.
 # For example:
@@ -16,6 +16,7 @@ KERNEL_MINOR := $(shell echo $(KERNEL_VERSION) | cut -d '.' -f 2)
 # Therefore, add -std=gnu11 to suppress this error.
 ifeq ($(shell expr $(KERNEL_MAJOR) \< 5 \| $(KERNEL_MAJOR) = 5 \& $(KERNEL_MINOR) \<= 17), 1)
   CFLAGS_agnocast.o += -std=gnu11
+  CFLAGS_agnocast_kunit.o += -std=gnu11
 endif
 
 
@@ -25,12 +26,15 @@ endif
 # this, we should add -Wno-declaration-after-statement.
 ifeq ($(shell expr $(KERNEL_MAJOR) \< 6 \| $(KERNEL_MAJOR) = 6 \& $(KERNEL_MINOR) \<= 4), 1)
   CFLAGS_agnocast.o += -Wno-declaration-after-statement
+  CFLAGS_agnocast_kunit.o += -Wno-declaration-after-statement
 endif
 
 # For KUnit
 ifeq ($(CONFIG_KUNIT),y)
   obj-m += agnocast_kunit.o
+	agnocast_kunit-m := agnocast_kunit_main.o agnocast.o
 endif
+
 ifeq ($(CONFIG_GCOV_KERNEL),y)
   CFLAGS_agnocast.o += -fprofile-arcs -ftest-coverage
   CFLAGS_agnocast_kunit.o += -fprofile-arcs -ftest-coverage

kmod/agnocast.c

@@ -1690,6 +1690,13 @@ static struct kprobe kp = {
 
 // =========================================
 
+void tmp_func(void)
+{
+  printk("tmp_func");
+}
+
+EXPORT_SYMBOL(tmp_func);
+
 static int agnocast_init(void)
 {
   mutex_init(&global_mutex);

kmod/agnocast.h

@@ -143,3 +143,5 @@ union ioctl_get_subscriber_num_args {
 #define AGNOCAST_TAKE_MSG_CMD _IOW('M', 5, union ioctl_take_msg_args)
 #define AGNOCAST_NEW_SHM_CMD _IOW('I', 1, union ioctl_new_shm_args)
 #define AGNOCAST_GET_SUBSCRIBER_NUM_CMD _IOW('G', 1, union ioctl_get_subscriber_num_args)
+
+void tmp_func(void);

kmod/agnocast_kunit.c → kmod/agnocast_kunit_main.c

@@ -6,6 +6,8 @@ MODULE_LICENSE("Dual BSD/GPL");
 
 static void agnocast_sample_test_case(struct kunit * test)
 {
+  printk("hoge");
+  tmp_func();
   KUNIT_EXPECT_EQ(test, 1 + 1, 2);
 }