92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/*
|
|
* Common functions for in-kernel torture tests.
|
|
*
|
|
* 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; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, you can access it online at
|
|
* http://www.gnu.org/licenses/gpl-2.0.html.
|
|
*
|
|
* Copyright (C) IBM Corporation, 2014
|
|
*
|
|
* Author: Paul E. McKenney <paulmck@us.ibm.com>
|
|
* Based on kernel/rcu/torture.c.
|
|
*/
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/err.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/atomic.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/freezer.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/trace_clock.h>
|
|
#include <asm/byteorder.h>
|
|
#include <linux/torture.h>
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com>");
|
|
|
|
int fullstop = FULLSTOP_RMMOD;
|
|
EXPORT_SYMBOL_GPL(fullstop);
|
|
DEFINE_MUTEX(fullstop_mutex);
|
|
EXPORT_SYMBOL_GPL(fullstop_mutex);
|
|
|
|
#define TORTURE_RANDOM_MULT 39916801 /* prime */
|
|
#define TORTURE_RANDOM_ADD 479001701 /* prime */
|
|
#define TORTURE_RANDOM_REFRESH 10000
|
|
|
|
/*
|
|
* Crude but fast random-number generator. Uses a linear congruential
|
|
* generator, with occasional help from cpu_clock().
|
|
*/
|
|
unsigned long
|
|
torture_random(struct torture_random_state *trsp)
|
|
{
|
|
if (--trsp->trs_count < 0) {
|
|
trsp->trs_state += (unsigned long)local_clock();
|
|
trsp->trs_count = TORTURE_RANDOM_REFRESH;
|
|
}
|
|
trsp->trs_state = trsp->trs_state * TORTURE_RANDOM_MULT +
|
|
TORTURE_RANDOM_ADD;
|
|
return swahw32(trsp->trs_state);
|
|
}
|
|
EXPORT_SYMBOL_GPL(torture_random);
|
|
|
|
/*
|
|
* Absorb kthreads into a kernel function that won't return, so that
|
|
* they won't ever access module text or data again.
|
|
*/
|
|
void torture_shutdown_absorb(const char *title)
|
|
{
|
|
while (ACCESS_ONCE(fullstop) == FULLSTOP_SHUTDOWN) {
|
|
pr_notice(
|
|
"torture thread %s parking due to system shutdown\n",
|
|
title);
|
|
schedule_timeout_uninterruptible(MAX_SCHEDULE_TIMEOUT);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(torture_shutdown_absorb);
|