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Re: [PATCHv2 0/2] THREAD_INFO_IN_TASK prep work for arm64+s390

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  Re: [PATCHv2 0/2] THREAD_INFO_IN_TASK prep work for arm64+s390 Mark Rutland <mark.rutland@arm.com> - 2016-11-02 17:00 +0100
    Re: [PATCHv2 0/2] THREAD_INFO_IN_TASK prep work for arm64+s390 Mark Rutland <mark.rutland@arm.com> - 2016-11-10 19:20 +0100
      Re: [PATCHv2 0/2] THREAD_INFO_IN_TASK prep work for arm64+s390 Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-11-11 10:20 +0100
        Re: [PATCHv2 0/2] THREAD_INFO_IN_TASK prep work for arm64+s390 Martin Schwidefsky <schwidefsky@de.ibm.com> - 2016-11-11 16:50 +0100
          Re: [PATCHv2 0/2] THREAD_INFO_IN_TASK prep work for arm64+s390 Mark Rutland <mark.rutland@arm.com> - 2016-11-11 17:30 +0100

#1513937 — Re: [PATCHv2 0/2] THREAD_INFO_IN_TASK prep work for arm64+s390

On Wed, Oct 26, 2016 at 06:43:05PM +0100, Mark Rutland wrote:
> Heiko and I have been working on THREAD_INFO_IN_TASK for s390 and arm64
> respectively, and we're both targetting v4.10.
> 
> These are the common core changes which we both require. I've put together a
> branch [1,2] based on v4.9-rc2. I intend to tag this at some point next week so
> that Heiko and I have a stable base.

As a heads-up, I've collated the tags I've received in the last few days, along
with the comment Andy requested in the v1 thread, and tagged this as
core-ti-stack-split [1].

Thanks,
Mark.

[1] git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git core-ti-stack-split

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#1519275

Hi Heiko,

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:
> > Heiko and I have been working on THREAD_INFO_IN_TASK for s390 and arm64
> > respectively, and we're both targetting v4.10.
> > 
> > These are the common core changes which we both require. I've put together a
> > branch [1,2] based on v4.9-rc2. I intend to tag this at some point next week so
> > that Heiko and I have a stable base.
> 
> As a heads-up, I've collated the tags I've received in the last few days, along
> with the comment Andy requested in the v1 thread, and tagged this as
> core-ti-stack-split [1].
> 
> Thanks,
> Mark.
> 
> [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?

Thanks,
Mark.

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#1519633

Hi Mark,

> 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:
> > > Heiko and I have been working on THREAD_INFO_IN_TASK for s390 and arm64
> > > respectively, and we're both targetting v4.10.
> > > 
> > > These are the common core changes which we both require. I've put together a
> > > branch [1,2] based on v4.9-rc2. I intend to tag this at some point next week so
> > > that Heiko and I have a stable base.
> > 
> > As a heads-up, I've collated the tags I've received in the last few days, along
> > with the comment Andy requested in the v1 thread, and tagged this as
> > core-ti-stack-split [1].
> > 
> > Thanks,
> > Mark.
> > 
> > [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

branch soon.

In result we will have a struct thread_info that only contains the flags
field like x86 does.
So we don't depend an any other patches anymore...

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#1519862

On Fri, 11 Nov 2016 10:16:22 +0100
Heiko Carstens <heiko.carstens@de.ibm.com> wrote:

> Hi Mark,
> 
> > 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:
> > > > Heiko and I have been working on THREAD_INFO_IN_TASK for s390 and arm64
> > > > respectively, and we're both targetting v4.10.
> > > > 
> > > > These are the common core changes which we both require. I've put together a
> > > > branch [1,2] based on v4.9-rc2. I intend to tag this at some point next week so
> > > > that Heiko and I have a stable base.
> > > 
> > > As a heads-up, I've collated the tags I've received in the last few days, along
> > > with the comment Andy requested in the v1 thread, and tagged this as
> > > core-ti-stack-split [1].
> > > 
> > > Thanks,
> > > Mark.
> > > 
> > > [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
> 
> branch soon.
> 
> In result we will have a struct thread_info that only contains the flags
> field like x86 does.
> So we don't depend an any other patches anymore...

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

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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#1519895

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@de.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.

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