/* * 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 INIT(c) do { atomic64_set(&v, c); r = c; } while (0) static __init int 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); INIT(v0); atomic64_add(onestwos, &v); r += onestwos; BUG_ON(v.counter != r); INIT(v0); atomic64_add(-one, &v); r += -one; BUG_ON(v.counter != r); 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); atomic64_sub(onestwos, &v); r -= onestwos; BUG_ON(v.counter != r); INIT(v0); atomic64_sub(-one, &v); r -= -one; 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); #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_atomic64);