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Date: Wed, 30 Jun 2010 23:23:07 +0100 (BST)
From: "Maciej W. Rozycki" <macro@linux-mips.org>
To: Frederic Weisbecker <fweisbec@gmail.com>
cc: Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>,
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Subject: Re: [GIT PULL] x86 breakpoint regression fix
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On Wed, 30 Jun 2010, Frederic Weisbecker wrote:

> Right, in fact it was quite easy to find any documentation about it, it's
> just officially undocumented.

 I think it's simply not a part of the architecture.  IOW they are free to 
remove it at any time, though most likely it will be kept forever.  It's 
not like rocket science or whatever else to be kept hidden -- "everybody" 
knows this instruction (myself for at least 15 years).  That's stuff like 
FFREEP, etc. ;)

  Maciej