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 <asm/atomic.h> 13 14 #define INIT(c) do { atomic64_set(&v, c); r = c; } while (0) 15 static __init int test_atomic64(void) 16 { 17 long long v0 = 0xaaa31337c001d00dLL; 18 long long v1 = 0xdeadbeefdeafcafeLL; 19 long long v2 = 0xfaceabadf00df001LL; 20 long long onestwos = 0x1111111122222222LL; 21 long long one = 1LL; 22 23 atomic64_t v = ATOMIC64_INIT(v0); 24 long long r = v0; 25 BUG_ON(v.counter != r); 26 27 atomic64_set(&v, v1); 28 r = v1; 29 BUG_ON(v.counter != r); 30 BUG_ON(atomic64_read(&v) != r); 31 32 INIT(v0); 33 atomic64_add(onestwos, &v); 34 r += onestwos; 35 BUG_ON(v.counter != r); 36 37 INIT(v0); 38 atomic64_add(-one, &v); 39 r += -one; 40 BUG_ON(v.counter != r); 41 42 INIT(v0); 43 r += onestwos; 44 BUG_ON(atomic64_add_return(onestwos, &v) != r); 45 BUG_ON(v.counter != r); 46 47 INIT(v0); 48 r += -one; 49 BUG_ON(atomic64_add_return(-one, &v) != r); 50 BUG_ON(v.counter != r); 51 52 INIT(v0); 53 atomic64_sub(onestwos, &v); 54 r -= onestwos; 55 BUG_ON(v.counter != r); 56 57 INIT(v0); 58 atomic64_sub(-one, &v); 59 r -= -one; 60 BUG_ON(v.counter != r); 61 62 INIT(v0); 63 r -= onestwos; 64 BUG_ON(atomic64_sub_return(onestwos, &v) != r); 65 BUG_ON(v.counter != r); 66 67 INIT(v0); 68 r -= -one; 69 BUG_ON(atomic64_sub_return(-one, &v) != r); 70 BUG_ON(v.counter != r); 71 72 INIT(v0); 73 atomic64_inc(&v); 74 r += one; 75 BUG_ON(v.counter != r); 76 77 INIT(v0); 78 r += one; 79 BUG_ON(atomic64_inc_return(&v) != r); 80 BUG_ON(v.counter != r); 81 82 INIT(v0); 83 atomic64_dec(&v); 84 r -= one; 85 BUG_ON(v.counter != r); 86 87 INIT(v0); 88 r -= one; 89 BUG_ON(atomic64_dec_return(&v) != r); 90 BUG_ON(v.counter != r); 91 92 INIT(v0); 93 BUG_ON(atomic64_xchg(&v, v1) != v0); 94 r = v1; 95 BUG_ON(v.counter != r); 96 97 INIT(v0); 98 BUG_ON(atomic64_cmpxchg(&v, v0, v1) != v0); 99 r = v1; 100 BUG_ON(v.counter != r); 101 102 INIT(v0); 103 BUG_ON(atomic64_cmpxchg(&v, v2, v1) != v0); 104 BUG_ON(v.counter != r); 105 106 INIT(v0); 107 BUG_ON(atomic64_add_unless(&v, one, v0)); 108 BUG_ON(v.counter != r); 109 110 INIT(v0); 111 BUG_ON(!atomic64_add_unless(&v, one, v1)); 112 r += one; 113 BUG_ON(v.counter != r); 114 115 #if defined(CONFIG_X86) || defined(CONFIG_MIPS) || defined(CONFIG_PPC) || defined(_ASM_GENERIC_ATOMIC64_H) 116 INIT(onestwos); 117 BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1)); 118 r -= one; 119 BUG_ON(v.counter != r); 120 121 INIT(0); 122 BUG_ON(atomic64_dec_if_positive(&v) != -one); 123 BUG_ON(v.counter != r); 124 125 INIT(-one); 126 BUG_ON(atomic64_dec_if_positive(&v) != (-one - one)); 127 BUG_ON(v.counter != r); 128 #else 129 #warning Please implement atomic64_dec_if_positive for your architecture, and add it to the IF above 130 #endif 131 132 INIT(onestwos); 133 BUG_ON(!atomic64_inc_not_zero(&v)); 134 r += one; 135 BUG_ON(v.counter != r); 136 137 INIT(0); 138 BUG_ON(atomic64_inc_not_zero(&v)); 139 BUG_ON(v.counter != r); 140 141 INIT(-one); 142 BUG_ON(!atomic64_inc_not_zero(&v)); 143 r += one; 144 BUG_ON(v.counter != r); 145 146 #ifdef CONFIG_X86 147 printk(KERN_INFO "atomic64 test passed for %s platform %s CX8 and %s SSE\n", 148 #ifdef CONFIG_X86_64 149 "x86-64", 150 #elif defined(CONFIG_X86_CMPXCHG64) 151 "i586+", 152 #else 153 "i386+", 154 #endif 155 boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without", 156 boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without"); 157 #else 158 printk(KERN_INFO "atomic64 test passed\n"); 159 #endif 160 161 return 0; 162 } 163 164 core_initcall(test_atomic64); 165