linux-kernel - Re: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs

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Message-ID: <19422.1304540499@localhost>
Date:	Wed, 04 May 2011 16:21:39 -0400
From:	Valdis.Kletnieks@...edu
To:	Christoph Lameter <cl@...ux.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tejun Heo <tj@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Jens Axboe <axboe@...nel.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	werner <w.landgraf@...ru>, "H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs

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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