// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/livepatch.h>
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static int replace;
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module_param(replace, int, 0644);
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MODULE_PARM_DESC(replace, "replace (default=0)");
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#include <linux/seq_file.h>
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static int livepatch_meminfo_proc_show(struct seq_file *m, void *v)
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{
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seq_printf(m, "%s: %s\n", THIS_MODULE->name,
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"this has been live patched");
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return 0;
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}
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static struct klp_func funcs[] = {
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{
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.old_name = "meminfo_proc_show",
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.new_func = livepatch_meminfo_proc_show,
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}, {}
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};
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static struct klp_object objs[] = {
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{
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/* name being NULL means vmlinux */
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.funcs = funcs,
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}, {}
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};
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static struct klp_patch patch = {
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.mod = THIS_MODULE,
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.objs = objs,
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/* set .replace in the init function below for demo purposes */
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};
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static int test_klp_atomic_replace_init(void)
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{
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patch.replace = replace;
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return klp_enable_patch(&patch);
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}
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static void test_klp_atomic_replace_exit(void)
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{
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}
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module_init(test_klp_atomic_replace_init);
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module_exit(test_klp_atomic_replace_exit);
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MODULE_LICENSE("GPL");
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MODULE_INFO(livepatch, "Y");
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MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
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MODULE_DESCRIPTION("Livepatch test: atomic replace");
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