linux-kernel - Re: [PATCH] x86/dt: use linear irq domain for ioapic(s).

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Date:	Mon, 6 Aug 2012 18:04:35 +0200
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Grant Likely <grant.likely@...retlab.ca>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/dt: use linear irq domain for ioapic(s).

On Mon, Aug 06, 2012 at 09:38:11AM +0200, Sebastian Andrzej Siewior wrote:
> The former conversion to irq_domain_add_legacy() did not fully work
> since we miss the irq decs for NR_IRQS_LEGACY+.
> Ideally we could use irq_domain_add_simple() or the no-map variant (and
> program the virq <-> line mapping directly into ioapic) but this would
> require a different irq lookup in "do_IRQ()" and won't work with ACPI
> without changes. So this is probably easiest for everyone.
> 
> Signed-off-by: Sebastian Andrzej Siewior <sebastian@...akpoint.cc>

From a quick glance this looks much better than my patch. This depends
on a couple of patches in linux-next it seems, so I'll have to do some
rebasing before I can test. Still I think I should be able to get back
to you until the end of the week.

Thierry

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