diff --git a/hello1.c b/hello1.c
index ac30d84..3a455a2 100644
--- a/hello1.c
+++ b/hello1.c
@@ -76,7 +76,7 @@ static struct TimingList* add_new_node(struct TimingList *tail)
 
 static void print_time_diff(struct TimingList *node)
 {
-	printk(KERN_EMERG "%lld\n", node->t_after - node->t_before);
+	pr_info("%lld\n", node->t_after - node->t_before);
 }
 
 void destroy_list(void)
@@ -98,14 +98,12 @@ void destroy_list(void)
 static int __init hello_init(void)
 {
 	if (msg_count > 10) {
-		printk(KERN_EMERG "Error: msg_count too large (%d > 10)\n",
-				msg_count);
+		pr_err("Error: msg_count too large (%d > 10)\n", msg_count);
 		return -EINVAL;
 	}
 
 	if (msg_count == 0 || msg_count >= 5) {
-		printk(KERN_EMERG "Warning: msg_count = %d (msg_count == 0 or 5 <= msg_count <= 10)\n",
-				msg_count);
+		pr_warn("Warning: msg_count = %d (msg_count == 0 or 5 <= msg_count <= 10)\n", msg_count);
 	}
 
 	return 0;
@@ -120,7 +118,7 @@ void print_hello(void)
 		current_tail = add_new_node(current_tail);
 
 		current_tail->t_before = ktime_get();
-		printk(KERN_EMERG "Hello, world!\n");
+		pr_info("Hello, world!\n");
 		current_tail->t_after = ktime_get();
 	}
 }