Makefile

@@ -2,17 +2,13 @@
 ifneq ($(KERNELRELEASE),)
 # kbuild part of makefile
 obj-m   := hello1.o hello2.o
-ccflags-y := -I$(obj)/inc -g
+ccflags-y := -I$(obj)/inc
 else
 # normal makefile
 KDIR ?= /lib/modules/`uname -r`/build
 
 default:
 	$(MAKE) -C $(KDIR) M=$$PWD
-	cp hello1.ko hello1.ko.unstripped
-	$(CROSS_COMPILE)strip -g hello1.ko
-
 clean:
 	$(MAKE) -C $(KDIR) M=$$PWD clean
-
 endif

hello1.c

@@ -45,7 +45,6 @@ struct TimingList {
 };
 
 static struct TimingList *tl_head;
-static unsigned int bug_generator;
 
 static struct TimingList *write_first_node(void)
 {
@@ -60,12 +59,8 @@ static struct TimingList *insert_next_node(struct TimingList *tail)
 	struct TimingList *new_tl_node = kmalloc(sizeof(struct TimingList),
 						GFP_KERNEL);
 
-	if (bug_generator == 2) {
-		new_tl_node = NULL;
-	} else {
-		tail->next = new_tl_node;
-		new_tl_node->next = NULL;
-	}
+	tail->next = new_tl_node;
+	new_tl_node->next = NULL;
 
 	return new_tl_node;
 }
@@ -111,8 +106,6 @@ void print_hello(int msg_count)
 	struct TimingList *current_tail = tl_head;
 
 	for (i = 0; i < msg_count; i++) {
-		bug_generator = i;
-
 		current_tail = add_new_node(current_tail);
 
 		current_tail->t_before = ktime_get();

hello2.c

@@ -44,7 +44,10 @@ static unsigned int msg_count = 1;
 
 static int __init hello_init(void)
 {
-	BUG_ON(msg_count > 10);
+	if (msg_count > 10) {
+		pr_err("Error: msg_count too large (%d > 10)\n", msg_count);
+		return -EINVAL;
+	}
 
 	if (msg_count == 0 || msg_count >= 5)
 		pr_warn("Warning: msg_count = %d (msg_count == 0 or 5 <= msg_count <= 10)\n", msg_count);