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/bug.h>
13#include <linux/kernel.h>
14#include <linux/atomic.h>
15
16#define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)
17static __init int test_atomic64(void)
18{
19    long long v0 = 0xaaa31337c001d00dLL;
20    long long v1 = 0xdeadbeefdeafcafeLL;
21    long long v2 = 0xfaceabadf00df001LL;
22    long long onestwos = 0x1111111122222222LL;
23    long long one = 1LL;
24
25    atomic64_t v = ATOMIC64_INIT(v0);
26    long long r = v0;
27    BUG_ON(v.counter != r);
28
29    atomic64_set(&v, v1);
30    r = v1;
31    BUG_ON(v.counter != r);
32    BUG_ON(atomic64_read(&v) != r);
33
34    INIT(v0);
35    atomic64_add(onestwos, &v);
36    r += onestwos;
37    BUG_ON(v.counter != r);
38
39    INIT(v0);
40    atomic64_add(-one, &v);
41    r += -one;
42    BUG_ON(v.counter != r);
43
44    INIT(v0);
45    r += onestwos;
46    BUG_ON(atomic64_add_return(onestwos, &v) != r);
47    BUG_ON(v.counter != r);
48
49    INIT(v0);
50    r += -one;
51    BUG_ON(atomic64_add_return(-one, &v) != r);
52    BUG_ON(v.counter != r);
53
54    INIT(v0);
55    atomic64_sub(onestwos, &v);
56    r -= onestwos;
57    BUG_ON(v.counter != r);
58
59    INIT(v0);
60    atomic64_sub(-one, &v);
61    r -= -one;
62    BUG_ON(v.counter != r);
63
64    INIT(v0);
65    r -= onestwos;
66    BUG_ON(atomic64_sub_return(onestwos, &v) != r);
67    BUG_ON(v.counter != r);
68
69    INIT(v0);
70    r -= -one;
71    BUG_ON(atomic64_sub_return(-one, &v) != r);
72    BUG_ON(v.counter != r);
73
74    INIT(v0);
75    atomic64_inc(&v);
76    r += one;
77    BUG_ON(v.counter != r);
78
79    INIT(v0);
80    r += one;
81    BUG_ON(atomic64_inc_return(&v) != r);
82    BUG_ON(v.counter != r);
83
84    INIT(v0);
85    atomic64_dec(&v);
86    r -= one;
87    BUG_ON(v.counter != r);
88
89    INIT(v0);
90    r -= one;
91    BUG_ON(atomic64_dec_return(&v) != r);
92    BUG_ON(v.counter != r);
93
94    INIT(v0);
95    BUG_ON(atomic64_xchg(&v, v1) != v0);
96    r = v1;
97    BUG_ON(v.counter != r);
98
99    INIT(v0);
100    BUG_ON(atomic64_cmpxchg(&v, v0, v1) != v0);
101    r = v1;
102    BUG_ON(v.counter != r);
103
104    INIT(v0);
105    BUG_ON(atomic64_cmpxchg(&v, v2, v1) != v0);
106    BUG_ON(v.counter != r);
107
108    INIT(v0);
109    BUG_ON(atomic64_add_unless(&v, one, v0));
110    BUG_ON(v.counter != r);
111
112    INIT(v0);
113    BUG_ON(!atomic64_add_unless(&v, one, v1));
114    r += one;
115    BUG_ON(v.counter != r);
116
117#ifdef CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
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 select the above Kconfig symbol
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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