linux-kernel - Re: [Patch V3 19/37] x86, irq: introduce mechanisms to support dynamically allocate IRQ for IOAPIC

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Date:	Wed, 28 May 2014 12:39:12 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Grant Likely <grant.likely@...aro.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>, x86@...nel.org,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	linux-pm@...r.kernel.org
Subject: Re: [Patch V3 19/37] x86, irq: introduce mechanisms to support dynamically
 allocate IRQ for IOAPIC

On 05/28/2014 12:07 PM, Thomas Gleixner wrote:
> 
> Right, so it needs the setup of irq 0 and that only happens when the
> legacy_pic->nr_legacy_irqs > 0.
>
> Do you remember, why we switch to the null_pic later on?

According to my memory all interrupts are serviced by the IOAPIC. The
first 16 by the first IOAPIC, 17+ (everything behind the "PCI-bus") by
the second IOAPIC. For that reason I didn't see a reason for the legacy
PIC and set it to null_pic. Due to the timer problem it is delayed.

> Thanks,
> 
> 	tglx

Sebastian
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