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

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Message-ID: <20150428105243.GV23123@twins.programming.kicks-ass.net>
Date:	Tue, 28 Apr 2015 12:52:43 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Liang, Kan" <kan.liang@...el.com>
Cc:	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, 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.
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