On Sun, Dec 30, 2007 at 02:05:44PM +0100, Ingo Molnar wrote:
>
> * Andi Kleen <[email protected]> wrote:
>
> > > drivers that then are shown to really need it could use their *own*
> > > ports.
> >
> > The i8259 driver uses it and it is known to be needed on some old
> > chipsets. But it doesn't really have any "own" ports to use afaik.
>
> we'll solve that via an i8259-specific quirk. That is a lot cleaner and
> maintainable than the current generic, always-enabled "opt out"
> port-0x80 quirk.
You mean using pci quirks + udelay? Will be probably challenging to collect
PCI-IDs for that. And there might be old systems needing it without PCI.
They likely won't have DMI either.
In theory you could make it a DMI year cut off of course (and assume old
if no DMI, although that happens occasionally with new systems too); but
that is generally considered ugly.
I don't think it's a big problem to keep delays of some form by default in 8259 --
people who care about performance should be definitely using APIC mode instead.
-Andi
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