/* * 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);