From 24e5d4918db371a2c670be75a2fcae67757df6c5 Mon Sep 17 00:00:00 2001
From: LSKhappychild <lskook47@gmail.com>
Date: Fri, 23 Dec 2022 16:28:16 +0900
Subject: [PATCH] Revise proc_ops creation logic in ch2 proc kernel module
 exercise

---
 ch2/hello.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/ch2/hello.c b/ch2/hello.c
index f521088..0e47997 100644
--- a/ch2/hello.c
+++ b/ch2/hello.c
@@ -9,7 +9,7 @@
  * Operating System Concepts - 10th Edition
  * Copyright John Wiley & Sons - 2018
  */
-
+#include <linux/version.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
@@ -26,11 +26,19 @@
  */
 static ssize_t proc_read(struct file *file, char *buf, size_t count, loff_t *pos);
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)
+#define HAVE_PROC_OPS
+#endif
+#ifdef HAVE_PROC_OPS
+static const struct proc_ops proc_ops = {
+	.proc_read = proc_read
+};
+#else
 static struct file_operations proc_ops = {
         .owner = THIS_MODULE,
         .read = proc_read,
 };
-
+#endif
 
 /* This function is called when the module is loaded. */
 static int proc_init(void)