linux-kernel - Re: [PATCH 18/19] x86, io_apic: Introduce eoi_ioapic

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Message-ID: <20120925150905.GD2505@amd.com>
Date:	Tue, 25 Sep 2012 17:09:05 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
CC:	<x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	<joro@...tes.org>, Suresh Siddha <suresh.b.siddha@...el.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH 18/19] x86, io_apic: Introduce eoi_ioapic_pin call-back

On Sun, Aug 26, 2012 at 08:52:33PM +0200, Sebastian Andrzej Siewior wrote:
> Basically you shuffle the code from up there, down there and call from behind
> a function pointer. There are two things different this time:
> - no version check >= 0x20
>   I belive this is obsolete since this runs only on x86-64 with x(2)apic
>   support and assumes more or less version 0x20+ or we wouldn't be here at
>   all.

Right, all systems that have interrupt remapping have an io-apic version
of 0x20 or higher.

> - the irq_remapped(cfg) check is gone. The cfg thing is per-interrupt basis
>   created so you _now_ you act like the interrupt is remapped even if it is
>   not. Or am I wrong here?

That comes from the fact that with the current implementation (with and
without my patches) IO-APIC interrupts are always remapped. So it is
safe to remove that check.

> > +
> New line and the end? Why would that be?

Coding leftover, I'll remove that.


	Joerg

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