Re: [PATCH] x86: update mptable v7

[Len Brown]

On Wed, 18 Jun 2008, Yinghai Lu wrote:

> On Wed, Jun 18, 2008 at 3:18 PM, Len Brown <lenb@xxxxxxxxxx> wrote:
> >
> >
> > On Sun, 1 Jun 2008, Yinghai Lu wrote:
> >
> >>
> >> make mptable to be consistent to acpi routing, so we could
> >> 1. kexec kernel with acpi=off
> >> 2. workaround BIOS that acpi routing is working, but mptable is not right.
> >>    so can use kernel/kexec to start other os that doesn't have good acpi support
> >
> > Is this an effort to boot an ACPI-mode kernel,
> > and then kexec a non-ACPI kernel?
> 
> Yes,

Why is this feature needed?
There are a number of ways that the resulting kernel may fail,
all platform specific.

> >
> > Doing so could confuse the heck out of the platform firmware,
> > which will think that an ACPI-mode kernel is still running.
> >
> > Note that it is a historic artifact, now considered a bug,
> > that ACPI uses the MPS code.  We should be divorcing these
> > two bodies of code rather than mixing them further.
> 
> how about adding config option to not compile mptable related info?

That's the idea.
CONFIG_MPS=n CONFIG_ACPI=y should build and run on
every PC built in this century.

This was prototyped a long while back, but the
tree has churned so much since then the old
prototype is worthless.

-Len

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/