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From: Vince Weaver <vincent.weaver@maine.edu>
X-Google-Original-From: Vince Weaver <vince@maine.edu>
Date: Thu, 3 Aug 2017 14:04:17 -0400 (EDT)
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To: Peter Zijlstra <peterz@infradead.org>
cc: linux-kernel@vger.kernel.org, Andy Lutomirski <luto@kernel.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Stephane Eranian <eranian@gmail.com>
Subject: Re: perf: bug in rdpmc/mmap accounting after exec
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On Wed, 2 Aug 2017, Peter Zijlstra wrote:

> On Wed, Jul 26, 2017 at 03:39:01PM -0400, Vince Weaver wrote:
> > In fact, current->mm->context.perf_rdpmc_allowed goes negative which seems
> > like it shouldn't happen?

>
> Good find that...
> 
> The below seems to fix that for me.

yes, I can confirm that with this patch all of the various PAPI and 
perf_event_tests pass on my test system.

Thanks,

Vince