linux-kernel - Re: [GIT PULL] timers/nohz updates for v3.18

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Message-ID: <20141009151420.GA16529@kroah.com>
Date:	Thu, 9 Oct 2014 08:14:20 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	stable <stable@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] timers/nohz updates for v3.18

On Thu, Oct 09, 2014 at 04:36:16PM +0200, Frederic Weisbecker wrote:
> On Thu, Oct 09, 2014 at 06:50:04AM -0700, Greg KH wrote:
> > On Thu, Oct 09, 2014 at 02:57:25PM +0200, Frederic Weisbecker wrote:
> > > On Thu, Oct 09, 2014 at 06:34:26AM -0400, Linus Torvalds wrote:
> > > > Hmm..
> > > > 
> > > > On Thu, Oct 9, 2014 at 2:48 AM, Ingo Molnar <mingo@...nel.org> wrote:
> > > > >
> > > > > Please pull the latest timers-nohz-for-linus git tree from:
> > > > >
> > > > >    git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers-nohz-for-linus
> > > > >
> > > > >    # HEAD: 9b01f5bf3999a3db5b1bbd9fdfd80d8d304e94ee nohz: nohz full depends on irq work self IPI support
> > > > >
> > > > > Main changes:
> > > > >
> > > > >  - Fix the deadlock reported by Dave Jones et al
> > > > >  - Clean up and fix nohz_full interaction with arch abilities
> > > > >  - nohz init code consolidation/cleanup
> > > > 
> > > > Ok, pulled. But none of these are marked for stable, yet the deadlock
> > > > people are seeing is in 3.17. Is there a separate line of minimal
> > > > fixes just for that? Or was the lack of stable tags just an oversight?
> > > 
> > > It was first intended because the patchset is quite invasive and nohz full has
> > > no known users, or perhaps there is one... So I thought that backporting
> > > could be more dangerous than anything.
> > > 
> > > Now thinking more about it I could isolate the following patches for
> > > stable:
> > > 
> > >       irq_work: Introduce arch_irq_work_has_interrupt()
> > >       irq_work: Force raised irq work to run on irq work interrupt
> > >       x86: Tell irq work about self IPI support
> > >       arm: Tell irq work about self IPI support
> > > 
> > > Sending these to stable@...r.kernel.org would catch up, right? I
> > > can still do that.
> > 
> > If I can just pick those patches directly, that's all I need for the
> > stable trees.  What are the git ids in Linus's tree for these patches,
> > so that I know I got this correct?
> 
> Awesome, here we go in order:
> 
> _ c5c38ef3d70377dc504a6a3f611a3ec814bc757b: irq_work: Introduce arch_irq_work_has_interrupt()
> _ 76a33061b9323b7fdb220ae5fa116c10833ec22e: irq_work: Force raised irq work to run on irq work interrupt
> _ 3010279f0fc36f0388872203e63ca49912f648fd: x86: Tell irq work about self IPI support
> _ 09f6edd424218eb69078551b2ecfada1f2d098eb: arm: Tell irq work about self IPI support
> 
> Only 3.17 should be concerned.

Great, I'll queue these up soon.

greg k-h
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