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)
  17 static __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
 166 core_initcall(test_atomic64);