projects/linux·blob v3.13 · refs

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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);