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/kernel.h>
  13 #include <asm/atomic.h>
  14
  15 #define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)
  16 static __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
 166 core_initcall(test_atomic64);