From: Valdis.Kletnieks@vt.edu
To: Christoph Lameter <cl@linux.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Pekka Enberg <penberg@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>, Tejun Heo <tj@kernel.org>,
Ingo Molnar <mingo@elte.hu>, Jens Axboe <axboe@kernel.dk>,
Andrew Morton <akpm@linux-foundation.org>,
werner <w.landgraf@ru.ru>, "H. Peter Anvin" <hpa@zytor.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs
Date: Wed, 04 May 2011 16:21:39 -0400 [thread overview]
Message-ID: <19422.1304540499@localhost> (raw)
In-Reply-To: Your message of "Wed, 04 May 2011 15:04:39 CDT." <alpine.DEB.2.00.1105041454190.5495@router.home>
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On Wed, 04 May 2011 15:04:39 CDT, Christoph Lameter said:
> On Wed, 4 May 2011, Linus Torvalds wrote:
> > But cmpxchg DOES NOT MAKE SENSE without atomicity guarantees.
>
> This is not a real cmpxchg after all. Its not atomic in the sense of
> other functions. Its only "percpu atomic" if you want it that way. This is
> *not* a full cmpxchg_double().
Calling it a cmpxchg when it doesn't have the primary distinguishing property
of a hardware cmpxchg is just loading a bullet in the chamber and inviting
kernel hackers to point it at their feet...
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next prev parent reply other threads:[~2011-05-04 20:24 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-02 22:28 2.6.39-rc5-git2 boot crashs werner
2011-05-02 23:24 ` Linus Torvalds
[not found] ` <web-516990066@zbackend1.aha.ru>
2011-05-03 15:22 ` Linus Torvalds
2011-05-03 19:08 ` Ingo Molnar
2011-05-03 20:17 ` Linus Torvalds
2011-05-03 20:20 ` H. Peter Anvin
2011-05-03 20:50 ` Ingo Molnar
2011-05-03 21:45 ` Linus Torvalds
2011-05-03 22:01 ` H. Peter Anvin
2011-05-04 7:19 ` Borislav Petkov
2011-05-04 7:38 ` Ingo Molnar
2011-05-04 7:55 ` Borislav Petkov
2011-05-04 8:35 ` [block IO crash] " Ingo Molnar
2011-05-04 9:52 ` Thomas Gleixner
2011-05-04 10:19 ` Ingo Molnar
2011-05-04 10:25 ` Ingo Molnar
2011-05-04 10:33 ` Ingo Molnar
2011-05-04 12:37 ` Ingo Molnar
2011-05-04 12:36 ` Ingo Molnar
2011-05-04 11:11 ` Thomas Gleixner
2011-05-04 11:16 ` Pekka Enberg
2011-05-04 11:27 ` Tejun Heo
2011-05-04 12:51 ` Pekka Enberg
2011-05-04 12:57 ` Ingo Molnar
2011-05-04 13:02 ` Thomas Gleixner
2011-05-04 13:00 ` Thomas Gleixner
2011-05-04 13:20 ` Tejun Heo
2011-05-04 14:10 ` Thomas Gleixner
2011-05-04 14:14 ` Ingo Molnar
2011-05-04 14:36 ` [PATCH] slub: Fix the lockless code on 32-bit platforms with no 64-bit cmpxchg Ingo Molnar
2011-05-04 14:42 ` Christoph Lameter
2011-05-04 16:30 ` Ingo Molnar
2011-05-04 21:52 ` Ben Greear
2011-05-04 22:00 ` Linus Torvalds
2011-05-04 22:22 ` Ben Greear
2011-05-04 14:19 ` [block IO crash] Re: 2.6.39-rc5-git2 boot crashs Christoph Lameter
2011-05-04 14:25 ` Tejun Heo
2011-05-04 14:35 ` Christoph Lameter
2011-05-04 15:20 ` Ingo Molnar
2011-05-04 14:46 ` Thomas Gleixner
2011-05-04 15:00 ` Christoph Lameter
2011-05-04 15:13 ` Linus Torvalds
2011-05-04 15:28 ` Christoph Lameter
2011-05-04 15:37 ` Pekka Enberg
2011-05-04 15:53 ` Linus Torvalds
2011-05-04 18:20 ` Linus Torvalds
2011-05-04 18:49 ` Christoph Lameter
2011-05-04 19:07 ` Linus Torvalds
2011-05-04 19:30 ` Christoph Lameter
2011-05-04 19:38 ` Linus Torvalds
2011-05-04 20:04 ` Christoph Lameter
2011-05-04 20:21 ` Valdis.Kletnieks [this message]
2011-05-04 20:32 ` Christoph Lameter
2011-05-04 20:49 ` Ingo Molnar
2011-05-04 21:06 ` Linus Torvalds
2011-05-04 21:19 ` Linus Torvalds
2011-05-04 21:40 ` Thomas Gleixner
2011-05-05 9:54 ` Tejun Heo
2011-05-05 10:18 ` Ingo Molnar
2011-05-05 10:45 ` Thomas Gleixner
2011-05-05 18:20 ` Christoph Lameter
2011-05-05 19:13 ` Ingo Molnar
2011-05-05 19:53 ` werner
2011-05-05 20:09 ` Christoph Lameter
2011-05-05 21:12 ` werner
2011-05-05 22:27 ` Thomas Gleixner
[not found] ` <web-518008166@zbackend1.aha.ru>
[not found] ` <web-518059420@zbackend1.aha.ru>
[not found] ` <20110505060204.GA28015@elte.hu>
2011-05-05 6:46 ` werner
2011-05-04 15:37 ` [block IO crash] " Linus Torvalds
2011-05-04 16:08 ` Christoph Lameter
2011-05-04 16:50 ` Ingo Molnar
2011-05-04 17:12 ` Thomas Gleixner
2011-05-04 15:41 ` Pekka Enberg
2011-05-04 13:22 ` Ingo Molnar
2011-05-04 14:21 ` Christoph Lameter
2011-05-04 14:04 ` Christoph Lameter
2011-05-04 14:07 ` Tejun Heo
2011-05-04 14:21 ` Thomas Gleixner
2011-05-04 10:13 ` Ingo Molnar
2011-05-04 10:41 ` Ingo Molnar
2011-05-04 10:45 ` Ingo Molnar
2011-05-04 11:06 ` Ingo Molnar
2011-05-04 12:37 ` Ingo Molnar
2011-05-04 12:47 ` Ingo Molnar
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