Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756013Ab0FHSLr (ORCPT ); Tue, 8 Jun 2010 14:11:47 -0400 Received: from terminus.zytor.com ([198.137.202.10]:36084 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755295Ab0FHSLq (ORCPT ); Tue, 8 Jun 2010 14:11:46 -0400 Message-ID: <4C0E87BB.4050303@zytor.com> Date: Tue, 08 Jun 2010 11:11:07 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100430 Fedora/3.0.4-3.fc13 Thunderbird/3.0.4 MIME-Version: 1.0 To: Alan Cox CC: "Eric W. Biederman" , Jacob Pan , Alan Cox , Arjan van de Ven , LKML , Ingo Molnar , Feng Tang , Len Brown Subject: Re: [PATCH] x86/sfi: fix ioapic gsi range References: <1275952044-27996-1-git-send-email-jacob.jun.pan@linux.intel.com> <4C0D8F43.4070900@zytor.com> <20100608091012.034f1cca@lxorguk.ukuu.org.uk> In-Reply-To: <20100608091012.034f1cca@lxorguk.ukuu.org.uk> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 994 Lines: 23 On 06/08/2010 01:10 AM, Alan Cox wrote: >>> You may not use a 1-1 mapping if you don't have legacy irqs. Linux >>> irqs 0-15 are the ISA irqs you may not use those irq numbers for > > Linux IRQ 0 is "no IRQ assigned", except buried in certain bits of arch > specific historical knowledge. > > Also calling 1-15 ISA IRQ lines is also somewhat misleading given they > are almost certainly routing for PCI devices. "PIC IRQ routing" maybe - > but even that is not really true on a lot of PC hardware today except by > convention. Yes, but I gather IRQ/GSI 0 is an early-acquire primary timer on MRST on Moorestown just as on PC/AT... just a different one. Hence "special" in the same sort of way. I don't really care, personally, though. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/