Re: [PATCH] x86: default to reboot via ACPI
From: Maciej W. Rozycki
Date: Tue Aug 26 2008 - 09:25:54 EST
On Tue, 26 Aug 2008, Avi Kivity wrote:
> Most machines are recent machines.
This is a bold statement I would say. Any numbers to back it up?
> If a machine doesn't have acpi, this change is safe.
>
> If a machine has acpi, but doesn't have the reset register set in the
> FADT, this change is safe.
>
> If a machine has acpi, and the reset register is set incorrectly, this
> change is safe.
>
> If a machine has acpi, and the reset register is wired to the launch
> controller, then perhaps this change is unsafe. Don't issue sysrq-b on
> such machines.
If a machine has ACPI and it is broken randomly, then the results can be
arbitrary. Hopefully not destructively. If even such a simple thing as
wiring the reset line so that it functions correctly can be got wrong,
more so can be more complex matters.
Failing a better alternative, I suppose the change has to go in though.
Maciej
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