projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| a2818ee4 JL |
1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | // Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com> | |
| 3 | ||
| 4 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
| 5 | ||
| 6 | #include <linux/module.h> | |
| 7 | #include <linux/kernel.h> | |
| 8 | #include <linux/livepatch.h> | |
| 9 | ||
| 10 | static int replace; | |
| 11 | module_param(replace, int, 0644); | |
| 12 | MODULE_PARM_DESC(replace, "replace (default=0)"); | |
| 13 | ||
| 14 | #include <linux/seq_file.h> | |
| 15 | static int livepatch_meminfo_proc_show(struct seq_file *m, void *v) | |
| 16 | { | |
| 17 | seq_printf(m, "%s: %s\n", THIS_MODULE->name, | |
| 18 | "this has been live patched"); | |
| 19 | return 0; | |
| 20 | } | |
| 21 | ||
| 22 | static struct klp_func funcs[] = { | |
| 23 | { | |
| 24 | .old_name = "meminfo_proc_show", | |
| 25 | .new_func = livepatch_meminfo_proc_show, | |
| 26 | }, {} | |
| 27 | }; | |
| 28 | ||
| 29 | static struct klp_object objs[] = { | |
| 30 | { | |
| 31 | /* name being NULL means vmlinux */ | |
| 32 | .funcs = funcs, | |
| 33 | }, {} | |
| 34 | }; | |
| 35 | ||
| 36 | static struct klp_patch patch = { | |
| 37 | .mod = THIS_MODULE, | |
| 38 | .objs = objs, | |
| 39 | /* set .replace in the init function below for demo purposes */ | |
| 40 | }; | |
| 41 | ||
| 42 | static int test_klp_atomic_replace_init(void) | |
| 43 | { | |
| 44 | patch.replace = replace; | |
| 45 | return klp_enable_patch(&patch); | |
| 46 | } | |
| 47 | ||
| 48 | static void test_klp_atomic_replace_exit(void) | |
| 49 | { | |
| 50 | } | |
| 51 | ||
| 52 | module_init(test_klp_atomic_replace_init); | |
| 53 | module_exit(test_klp_atomic_replace_exit); | |
| 54 | MODULE_LICENSE("GPL"); | |
| 55 | MODULE_INFO(livepatch, "Y"); | |
| 56 | MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>"); | |
| 57 | MODULE_DESCRIPTION("Livepatch test: atomic replace"); |