From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752914AbcGYO1T (ORCPT ); Mon, 25 Jul 2016 10:27:19 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:38956 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752132AbcGYO1I (ORCPT ); Mon, 25 Jul 2016 10:27:08 -0400 X-IBM-Helo: d06dlp03.portsmouth.uk.ibm.com X-IBM-MailFrom: heiko.carstens@de.ibm.com X-IBM-RcptTo: linux-arch@vger.kernel.org;linux-kernel@vger.kernel.org;linux-s390@vger.kernel.org Date: Mon, 25 Jul 2016 16:26:40 +0200 From: Heiko Carstens To: Christian Borntraeger Cc: Andy Lutomirski , Andrew Morton , x86 , "linux-kernel@vger.kernel.org" , Borislav Petkov , Linux Arch Mailing List , Oleg Nesterov , "linux-s390@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" Subject: Re: Is THREAD_INFO_IN_TASK appropriate for -mm for 4.8? References: <578DE406.9060902@de.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <578DE406.9060902@de.ibm.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16072514-0040-0000-0000-000002B23A5C X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16072514-0041-0000-0000-00001C5AC528 Message-Id: <20160725142640.GA4337@osiris> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-07-25_07:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1604210000 definitions=main-1607250169 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 19, 2016 at 10:25:42AM +0200, Christian Borntraeger wrote: > On 07/19/2016 01:47 AM, Andy Lutomirski wrote: > > Hi all- > > > > There are four core patches needed for the THREAD_INFO_IN_TASK thing, > > and they apply cleanly to -mm now. The x86 patch to flip the feature > > on does not apply cleanly anywhere because it depends on changes in > > -tip *and* in -mm. I'd like to get all of this as well as the rest of > > the vmap-stacks stuff in by 4.9, but I'm wondering if it might make > > sense to get the core THREAD_INFO_IN_TASK stuff into -mm for 4.8 > > instead. > > > > Pros: > > - It reduces the amount of core code that -tip will have to carry until 4.9. > > - It may benefit other architectures. Christian Borntraeger > > expressed an interest in enabling the feature for s390, but it'll be > > awkward for him until the core bit landed. Similarly, arm64 seems to > > be interested. > > I have not yet talked to Martin/Heiko about this, so not sure yet if and when > s390 is going to use this - so no pressure from our side yet. I wrote a patch four weeks ago which converts s390 based on Linus' orginal patches. So yes, we will convert s390 as soon as this hits upstream.