The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/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/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);

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