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23 October 2021, 00:29:24 UTC
Revision 2110cf029a67237db572299bb51e0de9e3e3d4dd authored by Linus Torvalds on 06 February 2013, 21:38:33 UTC, committed by Linus Torvalds on 06 February 2013, 21:38:33 UTC 
Merge branch 'for-linus' of git://git.kernel.dk/linux-block
 
Pull block layer updates from Jens Axboe:
 "I've got a few bits pending for 3.8 final, that I better get sent out.
  It's all been sitting for a while, I consider it safe.

  It contains:

   - Two bug fixes for mtip32xx, fixing a driver hang and a crash.

   - A few-liner protocol error fix for drbd.

   - A few fixes for the xen block front/back driver, fixing a potential
     data corruption issue.

   - A race fix for disk_clear_events(), causing spurious warnings.  Out
     of the Chrome OS base.

   - A deadlock fix for disk_clear_events(), moving it to the a
     unfreezable workqueue.  Also from the Chrome OS base."

* 'for-linus' of git://git.kernel.dk/linux-block:
  drbd: fix potential protocol error and resulting disconnect/reconnect
  mtip32xx: fix for crash when the device surprise removed during rebuild
  mtip32xx: fix for driver hang after a command timeout
  block: prevent race/cleanup
  block: remove deadlock in disk_clear_events
  xen-blkfront: handle bvecs with partial data
  llist/xen-blkfront: implement safe version of llist_for_each_entry
  xen-blkback: implement safe iterator for the list of persistent grants
2 parent s 1589a3e + 1383923
Raw File
Tip revision: 2110cf029a67237db572299bb51e0de9e3e3d4dd authored by Linus Torvalds on 06 February 2013, 21:38:33 UTC
Merge branch 'for-linus' of git://git.kernel.dk/linux-block
Tip revision: 2110cf0
atomic64_test.c 
/*
 * 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 <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
	printk(KERN_INFO "atomic64 test 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
	printk(KERN_INFO "atomic64 test passed\n");
#endif

	return 0;
}

core_initcall(test_atomic64);
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