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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 | |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | |
14 | #include <linux/init.h> |
15 | #include <linux/bug.h> |
16 | #include <linux/kernel.h> |
17 | #include <linux/atomic.h> |
18 | |
19 | #define INIT(c) do { atomic64_set(&v, c); r = c; } while (0) |
20 | static __init int test_atomic64(void) |
21 | { |
22 | long long v0 = 0xaaa31337c001d00dLL; |
23 | long long v1 = 0xdeadbeefdeafcafeLL; |
24 | long long v2 = 0xfaceabadf00df001LL; |
25 | long long onestwos = 0x1111111122222222LL; |
26 | long long one = 1LL; |
27 | |
28 | atomic64_t v = ATOMIC64_INIT(v0); |
29 | long long r = v0; |
30 | BUG_ON(v.counter != r); |
31 | |
32 | atomic64_set(&v, v1); |
33 | r = v1; |
34 | BUG_ON(v.counter != r); |
35 | BUG_ON(atomic64_read(&v) != r); |
36 | |
37 | INIT(v0); |
38 | atomic64_add(onestwos, &v); |
39 | r += onestwos; |
40 | BUG_ON(v.counter != r); |
41 | |
42 | INIT(v0); |
43 | atomic64_add(-one, &v); |
44 | r += -one; |
45 | BUG_ON(v.counter != r); |
46 | |
47 | INIT(v0); |
48 | r += onestwos; |
49 | BUG_ON(atomic64_add_return(onestwos, &v) != r); |
50 | BUG_ON(v.counter != r); |
51 | |
52 | INIT(v0); |
53 | r += -one; |
54 | BUG_ON(atomic64_add_return(-one, &v) != r); |
55 | BUG_ON(v.counter != r); |
56 | |
57 | INIT(v0); |
58 | atomic64_sub(onestwos, &v); |
59 | r -= onestwos; |
60 | BUG_ON(v.counter != r); |
61 | |
62 | INIT(v0); |
63 | atomic64_sub(-one, &v); |
64 | r -= -one; |
65 | BUG_ON(v.counter != r); |
66 | |
67 | INIT(v0); |
68 | r -= onestwos; |
69 | BUG_ON(atomic64_sub_return(onestwos, &v) != r); |
70 | BUG_ON(v.counter != r); |
71 | |
72 | INIT(v0); |
73 | r -= -one; |
74 | BUG_ON(atomic64_sub_return(-one, &v) != r); |
75 | BUG_ON(v.counter != r); |
76 | |
77 | INIT(v0); |
78 | atomic64_inc(&v); |
79 | r += one; |
80 | BUG_ON(v.counter != r); |
81 | |
82 | INIT(v0); |
83 | r += one; |
84 | BUG_ON(atomic64_inc_return(&v) != r); |
85 | BUG_ON(v.counter != r); |
86 | |
87 | INIT(v0); |
88 | atomic64_dec(&v); |
89 | r -= one; |
90 | BUG_ON(v.counter != r); |
91 | |
92 | INIT(v0); |
93 | r -= one; |
94 | BUG_ON(atomic64_dec_return(&v) != r); |
95 | BUG_ON(v.counter != r); |
96 | |
97 | INIT(v0); |
98 | BUG_ON(atomic64_xchg(&v, v1) != v0); |
99 | r = v1; |
100 | BUG_ON(v.counter != r); |
101 | |
102 | INIT(v0); |
103 | BUG_ON(atomic64_cmpxchg(&v, v0, v1) != v0); |
104 | r = v1; |
105 | BUG_ON(v.counter != r); |
106 | |
107 | INIT(v0); |
108 | BUG_ON(atomic64_cmpxchg(&v, v2, v1) != v0); |
109 | BUG_ON(v.counter != r); |
110 | |
111 | INIT(v0); |
112 | BUG_ON(atomic64_add_unless(&v, one, v0)); |
113 | BUG_ON(v.counter != r); |
114 | |
115 | INIT(v0); |
116 | BUG_ON(!atomic64_add_unless(&v, one, v1)); |
117 | r += one; |
118 | BUG_ON(v.counter != r); |
119 | |
120 | #ifdef CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE |
121 | INIT(onestwos); |
122 | BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1)); |
123 | r -= one; |
124 | BUG_ON(v.counter != r); |
125 | |
126 | INIT(0); |
127 | BUG_ON(atomic64_dec_if_positive(&v) != -one); |
128 | BUG_ON(v.counter != r); |
129 | |
130 | INIT(-one); |
131 | BUG_ON(atomic64_dec_if_positive(&v) != (-one - one)); |
132 | BUG_ON(v.counter != r); |
133 | #else |
134 | #warning Please implement atomic64_dec_if_positive for your architecture and select the above Kconfig symbol |
135 | #endif |
136 | |
137 | INIT(onestwos); |
138 | BUG_ON(!atomic64_inc_not_zero(&v)); |
139 | r += one; |
140 | BUG_ON(v.counter != r); |
141 | |
142 | INIT(0); |
143 | BUG_ON(atomic64_inc_not_zero(&v)); |
144 | BUG_ON(v.counter != r); |
145 | |
146 | INIT(-one); |
147 | BUG_ON(!atomic64_inc_not_zero(&v)); |
148 | r += one; |
149 | BUG_ON(v.counter != r); |
150 | |
151 | #ifdef CONFIG_X86 |
152 | pr_info("passed for %s platform %s CX8 and %s SSE\n", |
153 | #ifdef CONFIG_X86_64 |
154 | "x86-64", |
155 | #elif defined(CONFIG_X86_CMPXCHG64) |
156 | "i586+", |
157 | #else |
158 | "i386+", |
159 | #endif |
160 | boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without", |
161 | boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without"); |
162 | #else |
163 | pr_info("passed\n"); |
164 | #endif |
165 | |
166 | return 0; |
167 | } |
168 | |
169 | core_initcall(test_atomic64); |
170 |
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