Re: [PATCH] x86: fix typo(?) in step.c

From: Ingo Molnar
Date: Thu Mar 06 2008 - 08:13:55 EST



* Roland McGrath <roland@xxxxxxxxxx> 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
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