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Revise proc_ops creation logic in ch2 proc kernel module exercise #6

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Revise proc_ops creation logic in ch2 proc kernel module exercise #6

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12 changes: 10 additions & 2 deletions ch2/hello.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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>
Expand All @@ -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)
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