Re: FW: [PATCH] i386: irq: Kill IRQ compression

["Natalie Protasevich" <protasnb@gmail.com>]

l> From: Eric W. Biederman [mailto:ebiederm@xmission.com]
> Sent: Friday, February 16, 2007 2:22 AM
> To: Protasevich, Natalie
> Cc: Len Brown; Andi Kleen; lkml - Kernel Mailing List;
> linux-acpi@vger.kernel.org
> Subject: Re: [PATCH] i386: irq: Kill IRQ compression
>
> ebiederm@xmission.com (Eric W. Biederman) writes:
>
> > By itself I don't think we are going to observe any real problems
> > with this patch.
> >
> > However if we are going to be serious about this we need to do a
> > few more things.
> >
> > - kill ioapic_renumber_irq.
>
> Looking closer ioapic_renumber_irq does not appear to be an irq
> compress thing.  Rather it appears to be a work around for a weird
> acpi implementation where gsi 0 - 15 are not the ISA irqs.
>
> Natalie is my reading of the code there correct?

Yes, indeed.

> If so keeping ioapic_renumber_irq makes sense.  Although giving
> it a name that suggests it is working around weird implementation
> details would be good.

Sure. I think it was originally renumber_gsi something, but Len had to
change it so it sounds more explicit as familiar "IRQ".
--Natalie
> Eric
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