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Date: Wed, 4 Apr 2012 11:58:56 -0700
From: Greg Kroah-Hartman <greg@kroah.com>
To: Josh Boyer <jwboyer@gmail.com>
Cc: Jonathan Nieder <jrnieder@gmail.com>, Len Brown <lenb@kernel.org>,
        linux-acpi@vger.kernel.org, linux-pm@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org, Julian Anastasov <ja@ssi.bg>,
        Len Brown <len.brown@intel.com>, wzab@ise.pw.edu.pl,
        stable@vger.kernel.org
Subject: Re: [3.0.y, 3.2.y, 3.3.y] Re: [PATCH 04/76] ACPICA: Fix regression
 in FADT revision checks
Message-ID: <20120404185856.GA2272@kroah.com>
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On Tue, Apr 03, 2012 at 04:15:32PM -0400, Josh Boyer wrote:
> On Tue, Apr 3, 2012 at 3:58 PM, Jonathan Nieder <jrnieder@gmail.com> wrote:
> > Hi Greg,
> >
> > Josh Boyer wrote:
> >> On Fri, Mar 30, 2012 at 6:13 AM, Len Brown <lenb@kernel.org> wrote:
> >
> >>> From: Julian Anastasov <ja@ssi.bg>
> >>>
> >>>        commit 64b3db22c04586997ab4be46dd5a5b99f8a2d390 (2.6.39),
> >>> "Remove use of unreliable FADT revision field" causes regression
> >>> for old P4 systems because now cst_control and other fields are
> >>> not reset to 0.
> > [...]
> >>>        The fix is to update acpi_gbl_FADT.header.length after
> >>> the original value is used to check for old revisions.
> >>>
> >>> https://bugzilla.kernel.org/show_bug.cgi?id=42700
> >>> https://bugzilla.redhat.com/show_bug.cgi?id=727865
> >>>
> >>> Signed-off-by: Julian Anastasov <ja@ssi.bg>
> >>> Acked-by: Bob Moore <robert.moore@intel.com>
> >>> Signed-off-by: Len Brown <len.brown@intel.com>
> >>
> >> This one should go into the stable trees.
> >
> > Please apply
> >
> >  3e80acd1af40 "ACPICA: Fix regression in FADT revision checks"
> >
> > which is in linus's master to the 3.0.y, 3.2.y, and 3.3.y series to
> > fix this old boot problem.  (Many affected people disabled HT in the
> > BIOS to work around it in the meantime.)
> >
> > WZab (cc-ed) has tested that the patch addresses the problem when
> > applied to the 3.2.y and 3.3.y branches.  [1] has details.
> 
> We've had this applied in Fedora on 3.2 and 3.3 for a while now as
> well.

Wonderful, now queued up, thanks for letting me know.

greg k-h