linux-kernel - Re: [patch] genapic: optimize & fix APIC mode setup

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Message-ID: <20061113081616.GA25604@elte.hu>
Date:	Mon, 13 Nov 2006 09:16:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andi Kleen <ak@...e.de>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	ashok.raj@...el.com
Subject: Re: [patch] genapic: optimize & fix APIC mode setup

* Andi Kleen <ak@...e.de> wrote:

> Now if it causes device driver issues that's different of course. I 
> wasn't aware of this before.

lets try my patch in -mm for a while.

Had i ever noticed this hack in the first place i would have NAK-ed it. 
There is a fundamental design friction of a high-level feature like 
HOTPLUG_CPU /requiring/ a fundamental change to the lowlevel IRQ 
delivery mode! Such a requirement is broken and just serves to hide a 
flaw in the hotplug design - which flaw would trigger on i386 /anyway/, 
because i386 still uses logical delivery mode for APIC IPIs. Also, i'd 
like to have a description of how to reproduce those CPU hotplug 
problems, so that i can try to fix it.

	Ingo
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