linux-kernel - Re: [RFC Part2 v1 00/21] Enable hierarchy irqdomian on x86 platforms

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Message-ID: <alpine.DEB.2.10.1409242122380.4604@nanos>
Date:	Wed, 24 Sep 2014 21:25:16 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.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>,
	Borislav Petkov <bp@...en8.de>,
	Grant Likely <grant.likely@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC Part2 v1 00/21] Enable hierarchy irqdomian on x86
 platforms

On Wed, 24 Sep 2014, Yasuaki Ishimatsu wrote:
> I cannot imagine why the feature makes x86 irq architecture much more clear
> and more easy to maintain in this description. Of course, I have read the
> following threads:
> 
> https://lkml.org/lkml/2014/9/11/101

Here is the long version of the idea:

     https://lkml.org/lkml/2014/8/26/707

Short version is:

Separate the irq handling entities in a clear layered way instead of
having vector/[io]apic specific knowledge/data in places like msi,
remap etc.

Thanks,

	tglx

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