From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [RFC Part2 v1 00/21] Enable hierarchy irqdomian on x86
 platforms
Date: Wed, 24 Sep 2014 21:25:16 +0200 (CEST)
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To: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Jiang Liu <jiang.liu@linux.intel.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Bjorn Helgaas <bhelgaas@google.com>, Randy Dunlap <rdunlap@infradead.org>, Yinghai Lu <yinghai@kernel.org>, Borislav Petkov <bp@alien8.de>, Grant Likely <grant.likely@linaro.org>, Marc Zyngier <marc.zyngier@arm.com>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>, Andrew Morton <akpm@linux-foundation.org>, Tony Luck <tony.luck@intel.com>, Joerg Roedel <joro@8bytes.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, x86@kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org
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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