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From: Chuck Ebbert on 31 Jul 2010 01:50
On Fri, 30 Jul 2010 10:30:35 -0700
Greg KH <gregkh(a)suse.de> wrote:

> 2.6.33-stable review patch. If anyone has any objections, please let us know.
>
> ------------------
>
> From: Frederic Weisbecker <fweisbec(a)gmail.com>
>
> commit a1e80fafc9f0742a1776a0490258cb64912411b0 upstream.
>

This backport will not work. Instead of fixing up the context of this
patch to make it apply, commit 40f9249a73f6c251adea492b1c3d19d39e2a9bda
("x86/debug: Clear reserved bits of DR6 in do_debug()") should be
applied first, followed by an unmodified version of this commit.
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From: Frederic Weisbecker on 31 Jul 2010 08:10
On Sat, Jul 31, 2010 at 01:39:19AM -0400, Chuck Ebbert wrote:
> On Fri, 30 Jul 2010 10:30:35 -0700
> Greg KH <gregkh(a)suse.de> wrote:
>
> > 2.6.33-stable review patch. If anyone has any objections, please let us know.
> >
> > ------------------
> >
> > From: Frederic Weisbecker <fweisbec(a)gmail.com>
> >
> > commit a1e80fafc9f0742a1776a0490258cb64912411b0 upstream.
> >
>
> This backport will not work. Instead of fixing up the context of this
> patch to make it apply, commit 40f9249a73f6c251adea492b1c3d19d39e2a9bda
> ("x86/debug: Clear reserved bits of DR6 in do_debug()") should be
> applied first, followed by an unmodified version of this commit.


It works because the 2.6.33 backport is slightly different from the 2.6.34 one.
We are dealing with (dr6 & ~0xffff0ff0) rather than dr6.

Backporting the commit you describe seemed too invasive and risky
for me, so I preferred to use that mask to ignore the dr6 reserved bits while
checking the icebp origin, only.

Thanks.

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