1a2818ee4SJoe Lawrence // SPDX-License-Identifier: GPL-2.0
2a2818ee4SJoe Lawrence // Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
3a2818ee4SJoe Lawrence
4a2818ee4SJoe Lawrence #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
5a2818ee4SJoe Lawrence
6a2818ee4SJoe Lawrence #include <linux/module.h>
7a2818ee4SJoe Lawrence #include <linux/kernel.h>
8a2818ee4SJoe Lawrence #include <linux/livepatch.h>
9a2818ee4SJoe Lawrence
10a2818ee4SJoe Lawrence static int replace;
11a2818ee4SJoe Lawrence module_param(replace, int, 0644);
12a2818ee4SJoe Lawrence MODULE_PARM_DESC(replace, "replace (default=0)");
13a2818ee4SJoe Lawrence
14a2818ee4SJoe Lawrence #include <linux/seq_file.h>
livepatch_meminfo_proc_show(struct seq_file * m,void * v)15a2818ee4SJoe Lawrence static int livepatch_meminfo_proc_show(struct seq_file *m, void *v)
16a2818ee4SJoe Lawrence {
17a2818ee4SJoe Lawrence seq_printf(m, "%s: %s\n", THIS_MODULE->name,
18a2818ee4SJoe Lawrence "this has been live patched");
19a2818ee4SJoe Lawrence return 0;
20a2818ee4SJoe Lawrence }
21a2818ee4SJoe Lawrence
22a2818ee4SJoe Lawrence static struct klp_func funcs[] = {
23a2818ee4SJoe Lawrence {
24a2818ee4SJoe Lawrence .old_name = "meminfo_proc_show",
25a2818ee4SJoe Lawrence .new_func = livepatch_meminfo_proc_show,
26a2818ee4SJoe Lawrence }, {}
27a2818ee4SJoe Lawrence };
28a2818ee4SJoe Lawrence
29a2818ee4SJoe Lawrence static struct klp_object objs[] = {
30a2818ee4SJoe Lawrence {
31a2818ee4SJoe Lawrence /* name being NULL means vmlinux */
32a2818ee4SJoe Lawrence .funcs = funcs,
33a2818ee4SJoe Lawrence }, {}
34a2818ee4SJoe Lawrence };
35a2818ee4SJoe Lawrence
36a2818ee4SJoe Lawrence static struct klp_patch patch = {
37a2818ee4SJoe Lawrence .mod = THIS_MODULE,
38a2818ee4SJoe Lawrence .objs = objs,
39a2818ee4SJoe Lawrence /* set .replace in the init function below for demo purposes */
40a2818ee4SJoe Lawrence };
41a2818ee4SJoe Lawrence
test_klp_atomic_replace_init(void)42a2818ee4SJoe Lawrence static int test_klp_atomic_replace_init(void)
43a2818ee4SJoe Lawrence {
44a2818ee4SJoe Lawrence patch.replace = replace;
45a2818ee4SJoe Lawrence return klp_enable_patch(&patch);
46a2818ee4SJoe Lawrence }
47a2818ee4SJoe Lawrence
test_klp_atomic_replace_exit(void)48a2818ee4SJoe Lawrence static void test_klp_atomic_replace_exit(void)
49a2818ee4SJoe Lawrence {
50a2818ee4SJoe Lawrence }
51a2818ee4SJoe Lawrence
52a2818ee4SJoe Lawrence module_init(test_klp_atomic_replace_init);
53a2818ee4SJoe Lawrence module_exit(test_klp_atomic_replace_exit);
54a2818ee4SJoe Lawrence MODULE_LICENSE("GPL");
55a2818ee4SJoe Lawrence MODULE_INFO(livepatch, "Y");
56a2818ee4SJoe Lawrence MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
57a2818ee4SJoe Lawrence MODULE_DESCRIPTION("Livepatch test: atomic replace");
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