linux-kernel - Re: [tip:sched/urgent] x86, tsc: Fix a preemption leak in restore_sched_clock

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Date:	Mon, 13 Sep 2010 10:46:19 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Nico Schottelius <nico-linux-20100709@...ottelius.org>,
	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	a.p.zijlstra@...llo.nl, torvalds@...ux-foundation.org,
	peterz@...radead.org, flo@...n.at, lenb@...nel.org,
	jbarnes@...tuousgeek.org, suresh.b.siddha@...el.com,
	tglx@...utronix.de, rjw@...k.pl, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/urgent] x86, tsc: Fix a preemption leak in
 restore_sched_clock_state()


* Nico Schottelius <nico-linux-20100709@...ottelius.org> wrote:

> Good morning,
> 
> tip-bot for Peter Zijlstra [Sat, Sep 11, 2010 at 07:49:07AM +0000]:
> > Commit-ID:  55496c896b8a695140045099d4e0175cf09d4eae
> > Gitweb:     http://git.kernel.org/tip/55496c896b8a695140045099d4e0175cf09d4eae
> > Author:     Peter Zijlstra <peterz@...radead.org>
> > AuthorDate: Fri, 10 Sep 2010 22:32:53 +0200
> > Committer:  Ingo Molnar <mingo@...e.hu>
> > CommitDate: Sat, 11 Sep 2010 09:47:07 +0200
> > 
> > x86, tsc: Fix a preemption leak in restore_sched_clock_state()
> 
> running 2.6.36-rc3-00464-g84e1d83 now, which includes that fix.
> 
> So far no resume issues, but the backlight does not power on again,
> if the lid is opened.

That's probably unrelated.

> Manually triggering display backlight increase (via fn-home) changes 
> it to 100% though.
> 
> I've not seen that behaviour for a very long time and never on the 
> X201. It has been an issue on the X200, which means probably around 
> 2.6.30.

Might make sense to bisect it ... as long as you remember to do this at 
every bisection step that has the hung-suspend bug:

  git cherry-pick 55496c896b8a695140045099d4e0175cf09d4eae

Thanks,

	Ingo
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