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Commit 86a89380 authored by Luca Barbieri's avatar Luca Barbieri Committed by H. Peter Anvin
Browse files

lib: Add self-test for atomic64_t 



This patch adds self-test on boot code for atomic64_t.

This has been used to test the later changes in this patchset.

Signed-off-by: default avatarLuca Barbieri <luca@luca-barbieri.com>
LKML-Reference: <1267005265-27958-4-git-send-email-luca@luca-barbieri.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent 9c76b384

lib/Kconfig.debug

+7 −0
Original line number Diff line number Diff line
@@ -1054,6 +1054,13 @@ config DMA_API_DEBUG 
	  This option causes a performance degredation.  Use only if you want

	  to debug device drivers. If unsure, say N.



config ATOMIC64_SELFTEST

	bool "Perform an atomic64_t self-test at boot"

	help

	  Enable this option to test the atomic64_t functions at boot.



	  If unsure, say N.



source "samples/Kconfig"



source "lib/Kconfig.kgdb"

lib/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -99,6 +99,8 @@ obj-$(CONFIG_GENERIC_CSUM) += checksum.o 


obj-$(CONFIG_GENERIC_ATOMIC64) += atomic64.o



obj-$(CONFIG_ATOMIC64_SELFTEST) += atomic64_test.o



hostprogs-y	:= gen_crc32table

clean-files	:= crc32table.h

lib/atomic64_test.c

0 → 100644
+158 −0
Original line number Diff line number Diff line 
/*

 * 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.

 */

#include <linux/init.h>

#include <asm/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);



	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);



	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

	printk(KERN_INFO "atomic64 test passed for %s+ platform %s CX8 and %s SSE\n",

#ifdef CONFIG_X86_CMPXCHG64

			"586",

#else

			"386",

#endif

			boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",

			boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");

#else

	printk(KERN_INFO "atomic64 test passed\n");

#endif



	return 0;

}



core_initcall(test_atomic64);