From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759221Ab3E2Aez (ORCPT ); Tue, 28 May 2013 20:34:55 -0400 Received: from mga01.intel.com ([192.55.52.88]:6063 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757444Ab3E2Aey (ORCPT ); Tue, 28 May 2013 20:34:54 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.87,761,1363158000"; d="scan'208";a="341655575" Message-ID: <51A54D11.4050407@intel.com> Date: Tue, 28 May 2013 17:34:25 -0700 From: Dave Hansen User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130510 Thunderbird/17.0.6 MIME-Version: 1.0 To: Stephen Rothwell , LKML Subject: cpu hotplug broken in linux-next Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If I boot with: maxcpus=2 possible_cpus=4 I get # grep . /sys/devices/system/cpu/cpu[0-9]*/online' /sys/devices/system/cpu/cpu1/online:1 /sys/devices/system/cpu/cpu2/online:1 /sys/devices/system/cpu/cpu3/online:1 When 2 and 3 *should* be offline. I also get -EINVAL if I try to re-offline them in this state. 2 and 3 don't show up in /proc/cpuinfo, so sysfs just looks broken here. I'm bisecting it at the moment, but won't get to finish until tomorrow. Just thought I'd report early and often. :)