reactor_printk.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@kernel.org>
 4 *
 5 * Printk RV reactor:
 6 *   Prints the exception msg to the kernel message log.
 7 */
 8#include <linux/ftrace.h>
 9#include <linux/tracepoint.h>
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/rv.h>
14
15__printf(1, 0) static void rv_printk_reaction(const char *msg, va_list args)
16{
17	vprintk_deferred(msg, args);
18}
19
20static struct rv_reactor rv_printk = {
21	.name = "printk",
22	.description = "prints the exception msg to the kernel message log.",
23	.react = rv_printk_reaction
24};
25
26static int __init register_react_printk(void)
27{
28	rv_register_reactor(&rv_printk);
29	return 0;
30}
31
32static void __exit unregister_react_printk(void)
33{
34	rv_unregister_reactor(&rv_printk);
35}
36
37module_init(register_react_printk);
38module_exit(unregister_react_printk);
39
40MODULE_AUTHOR("Daniel Bristot de Oliveira");
41MODULE_DESCRIPTION("printk rv reactor: printk if an exception is hit.");