From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758084Ab0BMW0Q (ORCPT ); Sat, 13 Feb 2010 17:26:16 -0500 Received: from out01.mta.xmission.com ([166.70.13.231]:60390 "EHLO out01.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751267Ab0BMW0O (ORCPT ); Sat, 13 Feb 2010 17:26:14 -0500 To: Jeremy Fitzhardinge Cc: "H. Peter Anvin" , Yinghai Lu , Ingo Molnar , Thomas Gleixner , Andrew Morton , Suresh Siddha , linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/8] tip related: radix tree for spareseirq and logical flat clean up References: <1266029390-30907-1-git-send-email-yinghai@kernel.org> <4B762137.4050604@zytor.com> <83b97429-92d3-498f-b1a8-a6969713f7ba@email.android.com> From: ebiederm@xmission.com (Eric W. Biederman) Date: Sat, 13 Feb 2010 14:26:04 -0800 In-Reply-To: <83b97429-92d3-498f-b1a8-a6969713f7ba@email.android.com> (Jeremy Fitzhardinge's message of "Sat\, 13 Feb 2010 14\:12\:57 -0800") Message-ID: User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-XM-SPF: eid=;;;mid=;;;hst=in01.mta.xmission.com;;;ip=76.21.114.89;;;frm=ebiederm@xmission.com;;;spf=neutral X-SA-Exim-Connect-IP: 76.21.114.89 X-SA-Exim-Mail-From: ebiederm@xmission.com X-SA-Exim-Scanned: No (on in01.mta.xmission.com); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Jeremy Fitzhardinge writes: > I don't have the code in front of me, but I think that change should be OK. Xen just wants to initiate interrupt delivery for a given irq. At least for x86; I won't make any claims for ia64. Thanks. For ia64 the change should be a noop, generic_handle_irq_desc calls __do_IRQ when needed. On x86 the big differences are: - No more stack overflow check. - Not switching to the irq stack for i386. Eric