[PATCH] hotplug lockdep splat (tip)

[Lofstedt, Marta]

> -----Original Message-----
> From: Peter Zijlstra [mailto:peterz at infradead.org]
> Sent: Monday, October 2, 2017 10:25 AM
> To: Lofstedt, Marta <marta.lofstedt at intel.com>
> Cc: intel-gfx-trybot at lists.freedesktop.org
> Subject: Re: [PATCH] hotplug lockdep splat (tip)
> 
> On Mon, Oct 02, 2017 at 09:51:23AM +0300, Marta Lofstedt wrote:
> > From: Peter Zijlstra <peterz at infradead.org>
> >
> > On Mon, Sep 04, 2017 at 09:55:02AM +0200, Peter Zijlstra wrote:
> > > On Sun, Sep 03, 2017 at 08:59:35AM +0200, Mike Galbraith wrote:
> > > >
> > > > [  126.626908] Unregister pv shared memory for cpu 1 [
> > > > 126.631041] [  126.631269]
> > > > ======================================================
> > > > [  126.632442] WARNING: possible circular locking dependency detected
> > > > [  126.633599] 4.13.0.g06260ca-tip-lockdep #2 Tainted: G            E
> > > > [  126.634380]
> > > > ------------------------------------------------------
> > > > [  126.635124] stress-cpu-hotp/3156 is trying to acquire lock:
> > > > [  126.635804]  ((complete)&st->done){+.+.}, at:
> > > > [<ffffffff8108d19a>] takedown_cpu+0x8a/0xf0 [  126.636809] [
> > > > 126.636809] but task is already holding lock:
> > > > [  126.637567]  (sparse_irq_lock){+.+.}, at: [<ffffffff81107ac7>]
> > > > irq_lock_sparse+0x17/0x20 [  126.638665]
> > >
> > >
> https://lkml.kernel.org/r/20170829193416.GC32112@worktop.programming
> > > .kicks-ass.net
> > >
> > > I still need to write a coherent Changelog and comments for that :/
> >
> > How's this?
> 
> See:
> 
>   https//lkml.kernel.org/r/20170920170014.548896195 at infradead.org
> 
> Those patches landed in tip and this splat should no longer happen.

Cool, we will rebase i915 internal branch then. FYI the trybot results are looking good.

Thanks,
Marta