linux-kernel - Re: [PATCH] perf/x86/intel/uncore: fix IMC missing box initialization

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Message-ID: <alpine.DEB.2.20.1506081345170.7475@vincent-weaver-1.umelst.maine.edu>
Date:	Mon, 8 Jun 2015 13:45:56 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Ingo Molnar <mingo@...nel.org>
cc:	Peter Zijlstra <peterz@...radead.org>,
	"Liang, Kan" <kan.liang@...el.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Stephane Eranian <eranian@...gle.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Vince Weaver <vincent.weaver@...ne.edu>,
	LKML <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>, Sonny Rao <sonnyrao@...omium.org>
Subject: Re: [PATCH] perf/x86/intel/uncore: fix IMC missing box
 initialization

On Mon, 11 May 2015, Ingo Molnar wrote:

> 
> * Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > On Mon, Apr 27, 2015 at 03:43:32AM +0000, Liang, Kan wrote:
> > > 
> > > >
> > > > > This leads me to believe that this patch:
> > > > >
> > > > > commit c05199e5a57a579fea1e8fa65e2b511ceb524ffc
> > > > > Author: Kan Liang <kan.liang@...el.com>
> > > > > Date:   Tue Jan 20 04:54:25 2015 +0000
> > > > >
> > > > >     perf/x86/intel/uncore: Move uncore_box_init() out of driver
> > > > initialization
> > > > >
> > > > > If I revert it, I bet things will work again.
> > > >
> > > > Yes the initialization needs to be moved out of the IPI context.
> > 
> > I'm for the clean revert I think. Crashing is bad, but hiding/delaying
> > it seems counter productive too, it'll just mean we'll only learn about
> > it later.
> 
> So should I revert c05199e5a57a, with a Cc: stable?

any progress on this issue?  With 4.1-rc7 I can still quickly crash a 
Haswell machine due to this bug.

Vince
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