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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); |