linux-kernel - Re: [PATCH 3/3] ACPI: Bug compatibility for Windows on the ACPI reboot vector

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Message-Id: <201012092341.36260.rjw@sisk.pl>
Date:	Thu, 9 Dec 2010 23:41:36 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Matthew Garrett <mjg@...hat.com>, x86@...nel.org,
	linux-acpi@...r.kernel.org, lenb@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] ACPI: Bug compatibility for Windows on the ACPI reboot vector

On Thursday, December 09, 2010, H. Peter Anvin wrote:
> On 12/09/2010 01:46 PM, Matthew Garrett wrote:
> > Windows ignores the bit_offset and bit_width, despite the spec requiring
> > that they be validated. Drop the checks so that we match this behaviour.
> > Windows also goes straight for the keyboard controller if the ACPI reboot
> > fails, so we shouldn't sleep if we're still alive.
> >
> > Signed-off-by: Matthew Garrett<mjg@...hat.com>
> 
> Be careful: the goal isn't bug-compatibility with Windows, the goal is 
> to work on the maximum number of systems.  Bug-compatibility with 
> Windows *may* be a way to that goal, but it is not a guarantee, since 
> Windows doesn't get validated against older systems that went through 
> WHQL under an earlier version of Windows.

Agreed.

Rafael
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