From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757623AbaIRGVG (ORCPT ); Thu, 18 Sep 2014 02:21:06 -0400 Received: from mga02.intel.com ([134.134.136.20]:24248 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757527AbaIRGVE (ORCPT ); Thu, 18 Sep 2014 02:21:04 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.04,545,1406617200"; d="scan'208";a="478355199" Message-ID: <541A79CB.4040706@intel.com> Date: Wed, 17 Sep 2014 23:20:59 -0700 From: Dave Hansen User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Kevin Easton CC: "Ren, Qiaowei" , "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , "x86@kernel.org" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH v8 08/10] x86, mpx: add prctl commands PR_MPX_REGISTER, PR_MPX_UNREGISTER References: <1410425210-24789-1-git-send-email-qiaowei.ren@intel.com> <1410425210-24789-9-git-send-email-qiaowei.ren@intel.com> <20140916075007.GA22076@chicago.guarana.org> <9E0BE1322F2F2246BD820DA9FC397ADE017B32C6@shsmsx102.ccr.corp.intel.com> <20140918032334.GA26560@chicago.guarana.org> <541A62DD.7080502@intel.com> <20140918071741.GA29963@chicago.guarana.org> In-Reply-To: <20140918071741.GA29963@chicago.guarana.org> 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 On 09/18/2014 12:17 AM, Kevin Easton wrote: > I was assuming that if an application did want to enable MPX after threads > had already been created, it would generally want to enable it > simultaneously across all threads. This would be a lot easier for the > kernel than for the application. The current gcc setup mechanism would set up MPX even before main(). So I think it's pretty unlikely that help is needed to coordinate threads.