linux-kernel - [PATCH 0/3] x86

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Date:	Sun, 08 Oct 2006 07:39:38 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Muli Ben-Yehuda <muli@...ibm.com>,
	Linus Torvalds <torvalds@...l.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <ak@....de>,
	"Protasevich, Natalie" <Natalie.Protasevich@...SYS.com>,
	Andrew Morton <akpm@...l.org>,
	Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/3] x86_64 irq fixes

Muli Ben-Yehuda <muli@...ibm.com> writes:

> On Sat, Oct 07, 2006 at 10:52:24AM -0600, Eric W. Biederman wrote:
>
>> Can you try CONFIG_CPU_HOTPLUG?  That will force genapic to be set
>> to genapic_physflat instead of genapic_flat.
>
> Yep, it boots with CONFIG_CPU_HOTPLUG!
>
>> If genapic_physflat works we will have to decide what to do about
>> genapic_flat.
>
> I'm happy to test any follow-on patches to make it work without
> CONFIG_CPU_HOTPLUG.

Ok.  I have found a fairly clean way to structure the code that
should restore the previous behavior of the genapic_flat allowing
lowest priority interrupt delivery to work, and getting lucky
and avoiding your hardware that does not do what the software
tells it to :)

I still need to dig in and remove the BUG_ON in the interrupt
reception path, but that is a separate problem.

I also found another small bug in the pci_enable_irq because
of some code I failed to remove earlier, and the patches overlap
so I have made this a small patch series.

I have tested the code as best I can, and confirmation that this
fixes the original problem would be great.  But I don't see how
it could fail to fix the problem, as it restores genapic_flat to
global vector allocation.

Eric
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