From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764363AbXFAUit (ORCPT ); Fri, 1 Jun 2007 16:38:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762503AbXFAUim (ORCPT ); Fri, 1 Jun 2007 16:38:42 -0400 Received: from ogre.sisk.pl ([217.79.144.158]:57505 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762898AbXFAUil (ORCPT ); Fri, 1 Jun 2007 16:38:41 -0400 From: "Rafael J. Wysocki" To: "Eric W. Biederman" Subject: Re: [PATCH] x86: Document the hotplug code is incompatible with x86 irq handling Date: Fri, 1 Jun 2007 22:44:38 +0200 User-Agent: KMail/1.9.5 Cc: Robert Hancock , Andrew Morton , Andi Kleen , linux-kernel@vger.kernel.org, Neil Brown , Ingo Molnar References: <200706012206.15794.rjw@sisk.pl> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200706012244.39019.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org [Removed the Zwane's address from the CC list, because I get rejects from it] On Friday, 1 June 2007 22:29, Eric W. Biederman wrote: > "Rafael J. Wysocki" writes: > > > Very well, but could you _please_ give us some time to do this? > > > > We know of the problem now and will work to fix it, but it's not _that_ easy. > > > > In fact, we also rely on the CPU hotplug's code that takes tasks away from the > > offlined CPUs (and does the opposite with respect to the onlined CPUs), so > > we just can't get rid of the CPU hotplug _right_ _now_. > > Sure. My primary point was to document this, and get things moving if > possible to fix it. This patch is 2.6.23 at the earliest, so there is > some time to work on it even on the most optimistic merge schedule. > > I just don't want to be complacent and let this problem sit undetected > in back corner any more. So, can you advise what we can do to get the "nonboot" CPUs out of the picture during a suspend/hibernation? Greetings, Rafael -- "Premature optimization is the root of all evil." - Donald Knuth