forked from Minki/linux
51b1130eb5
Because rcu_torture_random() will be used by the locking equivalent to rcutorture, pull it out into its own module. This new module cannot be separately configured, instead, use the Kconfig "select" statement from the Kconfig options of tests depending on it. Suggested-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/*
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* Common functions for in-kernel torture tests.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you can access it online at
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* http://www.gnu.org/licenses/gpl-2.0.html.
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*
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* Copyright (C) IBM Corporation, 2014
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*
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* Author: Paul E. McKenney <paulmck@us.ibm.com>
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* Based on kernel/rcu/torture.c.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kthread.h>
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#include <linux/err.h>
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#include <linux/spinlock.h>
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#include <linux/smp.h>
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#include <linux/interrupt.h>
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#include <linux/sched.h>
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#include <linux/atomic.h>
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#include <linux/bitops.h>
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#include <linux/completion.h>
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#include <linux/moduleparam.h>
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#include <linux/percpu.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/freezer.h>
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#include <linux/cpu.h>
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#include <linux/delay.h>
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#include <linux/stat.h>
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#include <linux/slab.h>
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#include <linux/trace_clock.h>
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#include <asm/byteorder.h>
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#include <linux/torture.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com>");
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#define TORTURE_RANDOM_MULT 39916801 /* prime */
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#define TORTURE_RANDOM_ADD 479001701 /* prime */
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#define TORTURE_RANDOM_REFRESH 10000
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/*
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* Crude but fast random-number generator. Uses a linear congruential
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* generator, with occasional help from cpu_clock().
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*/
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unsigned long
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torture_random(struct torture_random_state *trsp)
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{
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if (--trsp->trs_count < 0) {
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trsp->trs_state += (unsigned long)local_clock();
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trsp->trs_count = TORTURE_RANDOM_REFRESH;
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}
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trsp->trs_state = trsp->trs_state * TORTURE_RANDOM_MULT +
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TORTURE_RANDOM_ADD;
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return swahw32(trsp->trs_state);
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}
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EXPORT_SYMBOL_GPL(torture_random);
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