diff --git a/dump_dir/dump_dir.c b/dump_dir/dump_dir.c
index 5440cf4..91559d8 100644
--- a/dump_dir/dump_dir.c
+++ b/dump_dir/dump_dir.c
@@ -14,8 +14,8 @@
 	}
 	else {
 		while((entry = readdir(dir)) != NULL)
-			printf("inode = %d  filename = %s\n",
-					(int)entry->d_ino, entry->d_name);
+			printf("inode = %d  filename = %s  type=%d \n",
+					(int)entry->d_ino, entry->d_name, entry->d_type);
 	}
 	closedir(dir);
 	return 0;
diff --git a/inotify/show_events.c b/inotify/show_events.c
index aeda69b..09a9322 100644
--- a/inotify/show_events.c
+++ b/inotify/show_events.c
@@ -5,6 +5,7 @@
  * 20201130 @miura added #include<unistd.h> to prevent warning of implicit declaration of functions:
  * read / close.
  */
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/lkmpg/hello_proc.c b/lkmpg/hello_proc.c
index ff75eec..903dc4d 100644
--- a/lkmpg/hello_proc.c
+++ b/lkmpg/hello_proc.c
@@ -8,6 +8,12 @@
 #include <linux/module.h> 
 #include <linux/proc_fs.h> 
 #include <linux/seq_file.h> 
+#include <linux/kernel.h>
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)
+#define HAVE_PROCOPS
+#endif
 
 static int hello_proc_show(struct seq_file *m, void *v) { 
     seq_printf(m, "Hello proc!\n"); 
@@ -18,13 +24,22 @@
     return single_open(file, hello_proc_show, NULL); 
 } 
 
-static const struct file_operations hello_proc_fops = { 
-    .owner = THIS_MODULE, 
-    .open = hello_proc_open, 
-    .read = seq_read, 
-    .llseek = seq_lseek, 
-    .release = single_release, 
+#ifdef HAVE_PROCOPS
+static const struct proc_ops hello_proc_fops = { 
+    .proc_open = hello_proc_open, 
+    .proc_read = seq_read, 
+    .proc_lseek = seq_lseek, 
+    .proc_release = single_release, 
 }; 
+#else
+static const struct file_operations hello_proc_fops = {
+    .owner = THIS_MODULE,
+    .open = hello_proc_open,
+    .read = seq_read,
+    .llseek = seq_lseek,
+    .release = single_release,
+};
+#endif
 
 static int __init hello_proc_init(void) { 
     proc_create("hello_proc", 0, NULL, &hello_proc_fops);