linux-kernel - Re: [PATCHv2 0/2] THREAD_INFO_IN

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Date:   Fri, 11 Nov 2016 16:23:43 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:     Heiko Carstens <heiko.carstens@...ibm.com>,
        catalin.marinas@....com, linux-arch@...r.kernel.org,
        akpm@...ux-foundation.org, keescook@...omium.org, luto@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 0/2] THREAD_INFO_IN_TASK prep work for arm64+s390

On Fri, Nov 11, 2016 at 04:42:37PM +0100, Martin Schwidefsky wrote:
> On Fri, 11 Nov 2016 10:16:22 +0100
> Heiko Carstens <heiko.carstens@...ibm.com> wrote:
> > > On Wed, Nov 02, 2016 at 03:56:26PM +0000, Mark Rutland wrote:
> > > > On Wed, Oct 26, 2016 at 06:43:05PM +0100, Mark Rutland wrote:

> > > > [1] git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git core-ti-stack-split
> > > 
> > > I believe that Catalin's hoping to take my arm64 patches for v4.10,
> > > using the above tag as a base.
> > > 
> > > What's the plan for s390? Are you happy to do the same?
> > 
> > We intend to merge the s390 variant also for v4.10. Our approach has
> > changed however: we came to the conclusion that having a per-cpu preempt
> > count will generate better code on s390; so Martin implemented that.
> > 
> > And while being at it he also moved the rest of the s390 specific stuff out
> > of our struct thread_info. The corresponding patches will be pushed to
> > 
> > git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git features

> Just pushed our collected works to the features branch, in case you are
> interested.

Thanks for the heads-up!

It doesn't look like we can do similar for arm64 (we don't have anything
akin to the lowcore stuff), but it certainly seems nicer for s390.

Thanks,
Mark.