Root/lib/atomic64_test.c

1/*
2 * Testsuite for atomic64_t functions
3 *
4 * Copyright © 2010 Luca Barbieri
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11#include <linux/init.h>
12#include <linux/kernel.h>
13#include <asm/atomic.h>
14
15#define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)
16static __init int test_atomic64(void)
17{
18    long long v0 = 0xaaa31337c001d00dLL;
19    long long v1 = 0xdeadbeefdeafcafeLL;
20    long long v2 = 0xfaceabadf00df001LL;
21    long long onestwos = 0x1111111122222222LL;
22    long long one = 1LL;
23
24    atomic64_t v = ATOMIC64_INIT(v0);
25    long long r = v0;
26    BUG_ON(v.counter != r);
27
28    atomic64_set(&v, v1);
29    r = v1;
30    BUG_ON(v.counter != r);
31    BUG_ON(atomic64_read(&v) != r);
32
33    INIT(v0);
34    atomic64_add(onestwos, &v);
35    r += onestwos;
36    BUG_ON(v.counter != r);
37
38    INIT(v0);
39    atomic64_add(-one, &v);
40    r += -one;
41    BUG_ON(v.counter != r);
42
43    INIT(v0);
44    r += onestwos;
45    BUG_ON(atomic64_add_return(onestwos, &v) != r);
46    BUG_ON(v.counter != r);
47
48    INIT(v0);
49    r += -one;
50    BUG_ON(atomic64_add_return(-one, &v) != r);
51    BUG_ON(v.counter != r);
52
53    INIT(v0);
54    atomic64_sub(onestwos, &v);
55    r -= onestwos;
56    BUG_ON(v.counter != r);
57
58    INIT(v0);
59    atomic64_sub(-one, &v);
60    r -= -one;
61    BUG_ON(v.counter != r);
62
63    INIT(v0);
64    r -= onestwos;
65    BUG_ON(atomic64_sub_return(onestwos, &v) != r);
66    BUG_ON(v.counter != r);
67
68    INIT(v0);
69    r -= -one;
70    BUG_ON(atomic64_sub_return(-one, &v) != r);
71    BUG_ON(v.counter != r);
72
73    INIT(v0);
74    atomic64_inc(&v);
75    r += one;
76    BUG_ON(v.counter != r);
77
78    INIT(v0);
79    r += one;
80    BUG_ON(atomic64_inc_return(&v) != r);
81    BUG_ON(v.counter != r);
82
83    INIT(v0);
84    atomic64_dec(&v);
85    r -= one;
86    BUG_ON(v.counter != r);
87
88    INIT(v0);
89    r -= one;
90    BUG_ON(atomic64_dec_return(&v) != r);
91    BUG_ON(v.counter != r);
92
93    INIT(v0);
94    BUG_ON(atomic64_xchg(&v, v1) != v0);
95    r = v1;
96    BUG_ON(v.counter != r);
97
98    INIT(v0);
99    BUG_ON(atomic64_cmpxchg(&v, v0, v1) != v0);
100    r = v1;
101    BUG_ON(v.counter != r);
102
103    INIT(v0);
104    BUG_ON(atomic64_cmpxchg(&v, v2, v1) != v0);
105    BUG_ON(v.counter != r);
106
107    INIT(v0);
108    BUG_ON(atomic64_add_unless(&v, one, v0));
109    BUG_ON(v.counter != r);
110
111    INIT(v0);
112    BUG_ON(!atomic64_add_unless(&v, one, v1));
113    r += one;
114    BUG_ON(v.counter != r);
115
116#if defined(CONFIG_X86) || defined(CONFIG_MIPS) || defined(CONFIG_PPC) || \
117    defined(CONFIG_S390) || defined(_ASM_GENERIC_ATOMIC64_H) || defined(CONFIG_ARM)
118    INIT(onestwos);
119    BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
120    r -= one;
121    BUG_ON(v.counter != r);
122
123    INIT(0);
124    BUG_ON(atomic64_dec_if_positive(&v) != -one);
125    BUG_ON(v.counter != r);
126
127    INIT(-one);
128    BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));
129    BUG_ON(v.counter != r);
130#else
131#warning Please implement atomic64_dec_if_positive for your architecture, and add it to the IF above
132#endif
133
134    INIT(onestwos);
135    BUG_ON(!atomic64_inc_not_zero(&v));
136    r += one;
137    BUG_ON(v.counter != r);
138
139    INIT(0);
140    BUG_ON(atomic64_inc_not_zero(&v));
141    BUG_ON(v.counter != r);
142
143    INIT(-one);
144    BUG_ON(!atomic64_inc_not_zero(&v));
145    r += one;
146    BUG_ON(v.counter != r);
147
148#ifdef CONFIG_X86
149    printk(KERN_INFO "atomic64 test passed for %s platform %s CX8 and %s SSE\n",
150#ifdef CONFIG_X86_64
151           "x86-64",
152#elif defined(CONFIG_X86_CMPXCHG64)
153           "i586+",
154#else
155           "i386+",
156#endif
157           boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",
158           boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");
159#else
160    printk(KERN_INFO "atomic64 test passed\n");
161#endif
162
163    return 0;
164}
165
166core_initcall(test_atomic64);
167

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