Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751220AbWC2XK3 (ORCPT ); Wed, 29 Mar 2006 18:10:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750951AbWC2XK3 (ORCPT ); Wed, 29 Mar 2006 18:10:29 -0500 Received: from mga07.intel.com ([143.182.124.22]:57240 "EHLO azsmga101.ch.intel.com") by vger.kernel.org with ESMTP id S1751220AbWC2XK3 (ORCPT ); Wed, 29 Mar 2006 18:10:29 -0500 TrustExchangeSourcedMail: True X-ExchangeTrusted: True X-IronPort-AV: i="4.03,145,1141632000"; d="scan'208"; a="16540038:sNHT2146938073" Date: Wed, 29 Mar 2006 15:09:51 -0800 From: Ashok Raj To: Andrew Morton Cc: Pavel Machek , linux-kernel@vger.kernel.org, Ashok Raj Subject: Re: [rfc] fix Kconfig, hotplug_cpu is needed for swsusp Message-ID: <20060329150950.A12482@unix-os.sc.intel.com> References: <20060329220808.GA1716@elf.ucw.cz> <20060329144746.358a6b4e.akpm@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <20060329144746.358a6b4e.akpm@osdl.org>; from akpm@osdl.org on Wed, Mar 29, 2006 at 02:47:46PM -0800 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1470 Lines: 36 On Wed, Mar 29, 2006 at 02:47:46PM -0800, Andrew Morton wrote: > Pavel Machek wrote: > > > > HOTPLUG_CPU is needed on normal PCs, too -- it is neccessary for > > software suspend. > > > > OK, this will get ugly. APICs are involved. I guess you need only on systems that support >1 cpu right? I doubt you will need it on a system that cannot run with the config-generic-arch on. although we use bigsmp when hotplug is turned on, all we really end up is using flat physical mode instead of using logical mode. I still havent understood why this wont work. Choosing CONFIG_X86_GENERICARCH shouldnt break anything AFAICT. Pavel, you could use CONFIG_HOTPLUG_CPU, just need to enable X86_GENERICARCH now. Is there a reason you think that wont work? I wish we would revert it for a strong reason that we know will not make hotplug work on certain systems because of this choise not that we currently have X86_PC now, and are unwiling to change the config. (PS: the word bigsmp although sounds like some large NR_CPUS, its just using a mode that permits the system to work from 1 .. >8 cpus. So there is really nothing determental to selecting this.) -- 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/