x86 ptrace: avoid unnecessary wrmsr

[linux.git] / kernel / backtracetest.c

/*
 * Simple stack backtrace regression test module
 *
 * (C) Copyright 2008 Intel Corporation
 * Author: Arjan van de Ven <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 2
 * of the License.
 */

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/delay.h>

static struct timer_list backtrace_timer;

static void backtrace_test_timer(unsigned long data)
{
	printk("Testing a backtrace from irq context.\n");
	printk("The following trace is a kernel self test and not a bug!\n");
	dump_stack();
}
static int backtrace_regression_test(void)
{
	printk("====[ backtrace testing ]===========\n");
	printk("Testing a backtrace from process context.\n");
	printk("The following trace is a kernel self test and not a bug!\n");
	dump_stack();

	init_timer(&backtrace_timer);
	backtrace_timer.function = backtrace_test_timer;
	mod_timer(&backtrace_timer, jiffies + 10);

	msleep(10);
	printk("====[ end of backtrace testing ]====\n");
	return 0;
}

static void exitf(void)
{
}

module_init(backtrace_regression_test);
module_exit(exitf);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Arjan van de Ven <[email protected]>");