From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751678AbWKHBzu (ORCPT ); Tue, 7 Nov 2006 20:55:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751887AbWKHBzu (ORCPT ); Tue, 7 Nov 2006 20:55:50 -0500 Received: from mga05.intel.com ([192.55.52.89]:372 "EHLO fmsmga101.fm.intel.com") by vger.kernel.org with ESMTP id S1751678AbWKHBzt (ORCPT ); Tue, 7 Nov 2006 20:55:49 -0500 X-ExtLoop1: 1 X-IronPort-AV: i="4.09,398,1157353200"; d="scan'208"; a="159773206:sNHT3142403936" Date: Tue, 7 Nov 2006 17:33:06 -0800 From: "Siddha, Suresh B" To: ak@suse.de, akpm@osdl.org Cc: shaohua.li@intel.com, linux-kernel@vger.kernel.org, discuss@x86-64.org, ashok.raj@intel.com, suresh.b.siddha@intel.com Subject: [patch 0/4] i386, x86_64: fix the irqbalance quirk for E7520/E7320/E7525 Message-ID: <20061107173306.C3262@unix-os.sc.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Mechanism of selecting physical mode in genapic when cpu hotplug is enabled on x86_64, broke the quirk(quirk_intel_irqbalance()) introduced for working around the transposing interrupt message errata in E7520/E7320/E7525 (revision ID 0x9 and below. errata #23 in http://download.intel.com/design/chipsets/specupdt/30304203.pdf). This errata requires the mode to be in logical flat, so that interrupts can be directed to more than one cpu(and thus use hardware IRQ balancing enabled by BIOS on these platforms). Following four patches fixes this by moving the quirk to early quirk and forcing the x86_64 genapic selection to logical flat on these platforms. Thanks to Shaohua for pointing out the breakage.