linux-kernel - Re: mmiotracer hangs the system

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Message-ID: <20160802113148.6784f2de@gandalf.local.home>
Date:	Tue, 2 Aug 2016 11:31:48 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Karol Herbst <karolherbst@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: mmiotracer hangs the system

On Tue, 2 Aug 2016 18:07:38 +0300
Andy Shevchenko <andy.shevchenko@...il.com> wrote:

> Use another Karol's address (found in MAINTAINERS)
> 
> On Tue, Aug 2, 2016 at 6:05 PM, Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
> > +Cc: Karol, Ingo
> >
> > On Tue, Aug 2, 2016 at 1:08 PM, Andy Shevchenko
> > <andy.shevchenko@...il.com> wrote:  
> >> Hi!
> >>
> >> I'm trying to use mmio tracer with recent kernels (in this particular
> >> case today's linux-next).  
> >
> > Tested on other board and found that v4.5 works while v4.5.7 doesn't.
> > Bisecting to
> >
> > commit d62a28a60562a8ba82e67e13c268245f37e796cb
> > Author: Karol Herbst <nouveau@...olherbst.de>
> > Date:   Thu Mar 3 02:03:11 2016 +0100
> >
> >     x86/mm/kmmio: Fix mmiotrace for hugepages
> >
> >     commit cfa52c0cfa4d727aa3e457bf29aeff296c528a08 upstream.
> >
> > Reverting _helps_ for x86 and x86_64 builds.
> >  

That commit was added in 4.6. Does that kernel work? Maybe it was a bad
backport?

-- Steve