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1// SPDX-License-Identifier: GPL-2.02// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>3 4#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt5 6#include <linux/module.h>7#include <linux/kernel.h>8#include <linux/livepatch.h>9 10static int replace;11module_param(replace, int, 0644);12MODULE_PARM_DESC(replace, "replace (default=0)");13 14#include <linux/seq_file.h>15static 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 22static struct klp_func funcs[] = {23 {24 .old_name = "meminfo_proc_show",25 .new_func = livepatch_meminfo_proc_show,26 }, {}27};28 29static struct klp_object objs[] = {30 {31 /* name being NULL means vmlinux */32 .funcs = funcs,33 }, {}34};35 36static struct klp_patch patch = {37 .mod = THIS_MODULE,38 .objs = objs,39 /* set .replace in the init function below for demo purposes */40};41 42static int test_klp_atomic_replace_init(void)43{44 patch.replace = replace;45 return klp_enable_patch(&patch);46}47 48static void test_klp_atomic_replace_exit(void)49{50}51 52module_init(test_klp_atomic_replace_init);53module_exit(test_klp_atomic_replace_exit);54MODULE_LICENSE("GPL");55MODULE_INFO(livepatch, "Y");56MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");57MODULE_DESCRIPTION("Livepatch test: atomic replace");58