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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 | /* * Testsuite for atomic64_t functions * * Copyright © 2010 Luca Barbieri * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/init.h> #include <linux/bug.h> #include <linux/kernel.h> #include <linux/atomic.h> #define TEST(bit, op, c_op, val) \ do { \ atomic##bit##_set(&v, v0); \ r = v0; \ atomic##bit##_##op(val, &v); \ r c_op val; \ WARN(atomic##bit##_read(&v) != r, "%Lx != %Lx\n", \ (unsigned long long)atomic##bit##_read(&v), \ (unsigned long long)r); \ } while (0) static __init void test_atomic(void) { int v0 = 0xaaa31337; int v1 = 0xdeadbeef; int onestwos = 0x11112222; int one = 1; atomic_t v; int r; TEST(, add, +=, onestwos); TEST(, add, +=, -one); TEST(, sub, -=, onestwos); TEST(, sub, -=, -one); TEST(, or, |=, v1); TEST(, and, &=, v1); TEST(, xor, ^=, v1); TEST(, andnot, &= ~, v1); } #define INIT(c) do { atomic64_set(&v, c); r = c; } while (0) static __init void test_atomic64(void) { long long v0 = 0xaaa31337c001d00dLL; long long v1 = 0xdeadbeefdeafcafeLL; long long v2 = 0xfaceabadf00df001LL; long long onestwos = 0x1111111122222222LL; long long one = 1LL; atomic64_t v = ATOMIC64_INIT(v0); long long r = v0; BUG_ON(v.counter != r); atomic64_set(&v, v1); r = v1; BUG_ON(v.counter != r); BUG_ON(atomic64_read(&v) != r); TEST(64, add, +=, onestwos); TEST(64, add, +=, -one); TEST(64, sub, -=, onestwos); TEST(64, sub, -=, -one); TEST(64, or, |=, v1); TEST(64, and, &=, v1); TEST(64, xor, ^=, v1); TEST(64, andnot, &= ~, v1); INIT(v0); r += onestwos; BUG_ON(atomic64_add_return(onestwos, &v) != r); BUG_ON(v.counter != r); INIT(v0); r += -one; BUG_ON(atomic64_add_return(-one, &v) != r); BUG_ON(v.counter != r); INIT(v0); r -= onestwos; BUG_ON(atomic64_sub_return(onestwos, &v) != r); BUG_ON(v.counter != r); INIT(v0); r -= -one; BUG_ON(atomic64_sub_return(-one, &v) != r); BUG_ON(v.counter != r); INIT(v0); atomic64_inc(&v); r += one; BUG_ON(v.counter != r); INIT(v0); r += one; BUG_ON(atomic64_inc_return(&v) != r); BUG_ON(v.counter != r); INIT(v0); atomic64_dec(&v); r -= one; BUG_ON(v.counter != r); INIT(v0); r -= one; BUG_ON(atomic64_dec_return(&v) != r); BUG_ON(v.counter != r); INIT(v0); BUG_ON(atomic64_xchg(&v, v1) != v0); r = v1; BUG_ON(v.counter != r); INIT(v0); BUG_ON(atomic64_cmpxchg(&v, v0, v1) != v0); r = v1; BUG_ON(v.counter != r); INIT(v0); BUG_ON(atomic64_cmpxchg(&v, v2, v1) != v0); BUG_ON(v.counter != r); INIT(v0); BUG_ON(atomic64_add_unless(&v, one, v0)); BUG_ON(v.counter != r); INIT(v0); BUG_ON(!atomic64_add_unless(&v, one, v1)); r += one; BUG_ON(v.counter != r); #ifdef CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE INIT(onestwos); BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1)); r -= one; BUG_ON(v.counter != r); INIT(0); BUG_ON(atomic64_dec_if_positive(&v) != -one); BUG_ON(v.counter != r); INIT(-one); BUG_ON(atomic64_dec_if_positive(&v) != (-one - one)); BUG_ON(v.counter != r); #else #warning Please implement atomic64_dec_if_positive for your architecture and select the above Kconfig symbol #endif INIT(onestwos); BUG_ON(!atomic64_inc_not_zero(&v)); r += one; BUG_ON(v.counter != r); INIT(0); BUG_ON(atomic64_inc_not_zero(&v)); BUG_ON(v.counter != r); INIT(-one); BUG_ON(!atomic64_inc_not_zero(&v)); r += one; BUG_ON(v.counter != r); } static __init int test_atomics(void) { test_atomic(); test_atomic64(); #ifdef CONFIG_X86 pr_info("passed for %s platform %s CX8 and %s SSE\n", #ifdef CONFIG_X86_64 "x86-64", #elif defined(CONFIG_X86_CMPXCHG64) "i586+", #else "i386+", #endif boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without", boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without"); #else pr_info("passed\n"); #endif return 0; } core_initcall(test_atomics); |