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

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Message-ID: <20080930035412.GA7049@linux.vnet.ibm.com>
Date:	Mon, 29 Sep 2008 20:54:12 -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 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.  ;-)

							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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