From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christian Borntraeger Subject: Re: Is THREAD_INFO_IN_TASK appropriate for -mm for 4.8? Date: Tue, 19 Jul 2016 10:25:42 +0200 Message-ID: <578DE406.9060902@de.ibm.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-arch-owner@vger.kernel.org List-Archive: List-Post: To: 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" List-ID: 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.