From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Rutland Subject: Re: Is THREAD_INFO_IN_TASK appropriate for -mm for 4.8? Date: Tue, 19 Jul 2016 12:22:41 +0100 Message-ID: <20160719112223.GA20476@leverpostej> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from foss.arm.com ([217.140.101.70]:34876 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752713AbcGSLXC (ORCPT ); Tue, 19 Jul 2016 07:23:02 -0400 Content-Disposition: inline In-Reply-To: Sender: linux-arch-owner@vger.kernel.org List-ID: To: Andy Lutomirski Cc: Andrew Morton , x86 , "linux-kernel@vger.kernel.org" , Borislav Petkov , Linux Arch Mailing List , Oleg Nesterov , Christian Borntraeger , "linux-s390@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" On Mon, Jul 18, 2016 at 04:47:39PM -0700, 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. This would probably be useful for arm64. There's still a reasonable amount to figure out (e.g. [1,2]), so from my PoV this is a nice-to-have, but there's no pressure. Thanks, Mark. [1] https://lkml.org/lkml/2016/7/11/193 [2] https://lkml.org/lkml/2016/7/11/483