Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750820AbWCVGbf (ORCPT ); Wed, 22 Mar 2006 01:31:35 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750828AbWCVGbf (ORCPT ); Wed, 22 Mar 2006 01:31:35 -0500 Received: from fmr21.intel.com ([143.183.121.13]:43926 "EHLO scsfmr001.sc.intel.com") by vger.kernel.org with ESMTP id S1750820AbWCVGbf (ORCPT ); Wed, 22 Mar 2006 01:31:35 -0500 Date: Tue, 21 Mar 2006 22:31:21 -0800 From: Ashok Raj To: Peter Williams Cc: Linus Torvalds , Linux Kernel Mailing List , akpm@osdl.org Subject: Re: Linux v2.6.16 Message-ID: <20060321223120.A4003@unix-os.sc.intel.com> References: <4420DF21.8060700@bigpond.net.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <4420DF21.8060700@bigpond.net.au>; from pwil3058@bigpond.net.au on Tue, Mar 21, 2006 at 09:22:41PM -0800 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1513 Lines: 43 On Tue, Mar 21, 2006 at 09:22:41PM -0800, Peter Williams wrote: > > I/O APICs > Mar 22 16:10:31 heathwren kernel: More than 8 CPUs detected and > CONFIG_X86_PC cannot handle it. > > ### No more CPUs seen but something in there thinks there's more than > 8 > of them. > > Mar 22 16:10:31 heathwren kernel: Use CONFIG_X86_GENERICARCH or > CONFIG_X86_BIGSMP. > This was disussed here, http://marc.theaimsgroup.com/?l=linux-kernel&m=114228068804099&w=2 but we didnt yet close out on it, Andrew didnt feel comfortable making CONFIG_HOTPLUG_CPU depend on !X86_PC, and making it depend on CONFIG_GENERICARCH or CONFIG_BIGSMP this late in the process. The warning is bogus, when BIGSMP was first introduced it was solely to handle >8 CPUS using custer mode configuration. We switched bigsmp to use flat physical mode just like what we do for x86_64, because some chipsets have ill effects with cpu hotplug. when we wakeup a new cpu. Details here http://marc.theaimsgroup.com/?l=linux-kernel&m=113261865814107&w=2 Hence we switched to bigsmp, but the error message was not reworked, better yet is to have the right config depends so we dont run into any race and instability issues. -- Cheers, Ashok Raj - Open Source Technology Center - 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/