linux/lib/atomic64_test.c
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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/kernel.h>
  13#include <linux/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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