linux-kernel - Re: [GIT pull] timer fixes for .27

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Message-ID: <20080930040203.GA9592@linux.vnet.ibm.com>
Date:	Mon, 29 Sep 2008 21:02:03 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [GIT pull] timer fixes for .27

On Mon, Sep 29, 2008 at 08:54:12PM -0700, Paul E. McKenney wrote:
> On Tue, Sep 30, 2008 at 01:41:56PM +1000, Benjamin Herrenschmidt wrote:
> > On Mon, 2008-09-29 at 15:44 -0700, Paul E. McKenney wrote:
> > > > Please pull the latest timers-fixes-for-linus git tree from:
> > > > 
> > > >
> > > git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git
> > > timers-fixes-for-linus
> > > > 
> > > > The patches fix hard to trigger bugs in the CPU offline code of
> > > > hrtimers which were noticed by Paul McKenney recently. In the worst
> > > > case they can leave migrated hrtimers in a stale state.
> > > 
> > > Acked-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > > Tested-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > 
> > Ah, so we found and fixed these ?
> 
> For "we" == Thomas, yes.  ;-)

One other thing -- these bugs affect x86 as well as Power.  Just takes
more stress for x86 to see the bugs in some cases.

 							Thanx, Paul

> > Linus, those bugs are actually a regression from when we didn't use the
> > new timer code (which isn't that long ago). It would be nice to have the
> > fixes in .27 (and thus in the various distros that will derive from it)
> > but I would understand if the size of the patch made you choke that late
> > in the -rc cycle... In which case we'll be in for more backports :-)
> > 
> > Cheers,
> > Ben.
> > 
> > 
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