linux-kernel - Re: Is THREAD_INFO_IN_TASK appropriate for -mm for 4.8?

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Date:	Mon, 25 Jul 2016 16:26:40 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Christian Borntraeger <borntraeger@...ibm.com>
Cc:	Andy Lutomirski <luto@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	x86 <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>,
	Linux Arch Mailing List <linux-arch@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: Is THREAD_INFO_IN_TASK appropriate for -mm for 4.8?

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.