linux-kernel - Re: [3.0.y, 3.2.y, 3.3.y] Re: [PATCH 04/76] ACPICA: Fix regression in FADT revision checks

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Date:	Tue, 3 Apr 2012 16:15:32 -0400
From:	Josh Boyer <jwboyer@...il.com>
To:	Jonathan Nieder <jrnieder@...il.com>
Cc:	Greg Kroah-Hartman <greg@...ah.com>, Len Brown <lenb@...nel.org>,
	linux-acpi@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, Julian Anastasov <ja@....bg>,
	Len Brown <len.brown@...el.com>, wzab@....pw.edu.pl,
	stable@...r.kernel.org
Subject: Re: [3.0.y, 3.2.y, 3.3.y] Re: [PATCH 04/76] ACPICA: Fix regression in
 FADT revision checks

On Tue, Apr 3, 2012 at 3:58 PM, Jonathan Nieder <jrnieder@...il.com> wrote:
> Hi Greg,
>
> Josh Boyer wrote:
>> On Fri, Mar 30, 2012 at 6:13 AM, Len Brown <lenb@...nel.org> wrote:
>
>>> From: Julian Anastasov <ja@....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@....bg>
>>> Acked-by: Bob Moore <robert.moore@...el.com>
>>> Signed-off-by: Len Brown <len.brown@...el.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.

josh
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