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); 167