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); 167