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From: Ingo Molnar <mingo@elte.hu>
To: Roland McGrath <roland@redhat.com>
Cc: Jan Beulich <jbeulich@novell.com>,
	tglx@linutronix.de, hpa@zytor.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86: fix typo(?) in step.c
Date: Thu, 6 Mar 2008 14:13:23 +0100	[thread overview]
Message-ID: <20080306131323.GD21359@elte.hu> (raw)
In-Reply-To: <20080306121648.A53FA2700FD@magilla.localdomain>


* Roland McGrath <roland@redhat.com> wrote:

> > So in theory the bug should manifest itself as block-step mode never 
> > clearing itself, once activated.
> 
> That doesn't happen in the trivial sense of "never", because in the 
> normal case an actual block-step exception happens and that makes the 
> hardware clear BTF from the MSR (as well as TF from eflags).  So it 
> would only come up in a more obscure case. [...]

ah, i missed that detail - this indeed makes this code a lot less 
dangerous.

/me stops worrying

	Ingo

      reply	other threads:[~2008-03-06 13:13 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-05  8:36 Jan Beulich
2008-03-05 13:41 ` Ingo Molnar
2008-03-06  7:52   ` Roland McGrath
2008-03-06 11:28     ` Ingo Molnar
2008-03-06 12:03       ` Roland McGrath
2008-03-06 13:11         ` Ingo Molnar
2008-03-10 11:53           ` Jan Beulich
2008-03-11  3:44             ` Roland McGrath
2008-03-06 11:34     ` Ingo Molnar
2008-03-06 12:16       ` Roland McGrath
2008-03-06 13:13         ` Ingo Molnar [this message]

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