projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 51b1130e PM |
1 | /* |
| 2 | * Common functions for in-kernel torture tests. | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License as published by | |
| 6 | * the Free Software Foundation; either version 2 of the License, or | |
| 7 | * (at your option) any later version. | |
| 8 | * | |
| 9 | * This program is distributed in the hope that it will be useful, | |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 | * GNU General Public License for more details. | |
| 13 | * | |
| 14 | * You should have received a copy of the GNU General Public License | |
| 15 | * along with this program; if not, you can access it online at | |
| 16 | * http://www.gnu.org/licenses/gpl-2.0.html. | |
| 17 | * | |
| 18 | * Copyright (C) IBM Corporation, 2014 | |
| 19 | * | |
| 20 | * Author: Paul E. McKenney <paulmck@us.ibm.com> | |
| 21 | * Based on kernel/rcu/torture.c. | |
| 22 | */ | |
| 23 | #include <linux/types.h> | |
| 24 | #include <linux/kernel.h> | |
| 25 | #include <linux/init.h> | |
| 26 | #include <linux/module.h> | |
| 27 | #include <linux/kthread.h> | |
| 28 | #include <linux/err.h> | |
| 29 | #include <linux/spinlock.h> | |
| 30 | #include <linux/smp.h> | |
| 31 | #include <linux/interrupt.h> | |
| 32 | #include <linux/sched.h> | |
| 33 | #include <linux/atomic.h> | |
| 34 | #include <linux/bitops.h> | |
| 35 | #include <linux/completion.h> | |
| 36 | #include <linux/moduleparam.h> | |
| 37 | #include <linux/percpu.h> | |
| 38 | #include <linux/notifier.h> | |
| 39 | #include <linux/reboot.h> | |
| 40 | #include <linux/freezer.h> | |
| 41 | #include <linux/cpu.h> | |
| 42 | #include <linux/delay.h> | |
| 43 | #include <linux/stat.h> | |
| 44 | #include <linux/slab.h> | |
| 45 | #include <linux/trace_clock.h> | |
| 46 | #include <asm/byteorder.h> | |
| 47 | #include <linux/torture.h> | |
| 48 | ||
| 49 | MODULE_LICENSE("GPL"); | |
| 50 | MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com>"); | |
| 51 | ||
| 52 | #define TORTURE_RANDOM_MULT 39916801 /* prime */ | |
| 53 | #define TORTURE_RANDOM_ADD 479001701 /* prime */ | |
| 54 | #define TORTURE_RANDOM_REFRESH 10000 | |
| 55 | ||
| 56 | /* | |
| 57 | * Crude but fast random-number generator. Uses a linear congruential | |
| 58 | * generator, with occasional help from cpu_clock(). | |
| 59 | */ | |
| 60 | unsigned long | |
| 61 | torture_random(struct torture_random_state *trsp) | |
| 62 | { | |
| 63 | if (--trsp->trs_count < 0) { | |
| 64 | trsp->trs_state += (unsigned long)local_clock(); | |
| 65 | trsp->trs_count = TORTURE_RANDOM_REFRESH; | |
| 66 | } | |
| 67 | trsp->trs_state = trsp->trs_state * TORTURE_RANDOM_MULT + | |
| 68 | TORTURE_RANDOM_ADD; | |
| 69 | return swahw32(trsp->trs_state); | |
| 70 | } | |
| 71 | EXPORT_SYMBOL_GPL(torture_random); |