From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754269AbYGVTRT (ORCPT ); Tue, 22 Jul 2008 15:17:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751207AbYGVTRL (ORCPT ); Tue, 22 Jul 2008 15:17:11 -0400 Received: from mga01.intel.com ([192.55.52.88]:63623 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750975AbYGVTRK (ORCPT ); Tue, 22 Jul 2008 15:17:10 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.31,232,1215414000"; d="scan'208";a="363813657" Date: Tue, 22 Jul 2008 12:17:09 -0700 From: Suresh Siddha To: Yinghai Lu Cc: "Siddha, Suresh B" , Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" , Jack Steiner , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH] x86: add apic probe for genapic 64bit v2 Message-ID: <20080722191708.GE14380@linux-os.sc.intel.com> References: <200807211836.27282.yhlu.kernel@gmail.com> <200807212208.22116.yhlu.kernel@gmail.com> <20080722175757.GC14380@linux-os.sc.intel.com> <86802c440807221105s77372df8re2e59440a8f644bd@mail.gmail.com> <20080722181056.GD14380@linux-os.sc.intel.com> <86802c440807221140o20dcc31fjc10f86a22a1125bb@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <86802c440807221140o20dcc31fjc10f86a22a1125bb@mail.gmail.com> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 22, 2008 at 11:40:13AM -0700, Yinghai Lu wrote: > could be apic mode is set to phys flat mode by BIOS. > > get > APIC error (0x40)... Does this happen while sending IPI's? AP bringup should be same irrespective of the genapic mode we select here. > that is the reason for introducing max_phys_apicid. We may need a workaround if it is some cpu/platform specific issue. But we need to understand the actual issue and document it properly, so that it doesn't break in the future. thanks, suresh