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Date: Thu, 12 May 2011 23:24:21 +0300
From: Alexey Dobriyan <adobriyan@gmail.com>
To: David Miller <davem@davemloft.net>
Cc: davej@redhat.com, eranian@google.com, acme@redhat.com,
        linux-kernel@vger.kernel.org
Subject: Re: [BUG] perf: bogus correlation of kernel symbols
Message-ID: <20110512202421.GA4623@p183>
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 <20110512.140630.1779004012724490077.davem@davemloft.net>
 <20110512183741.GA22269@redhat.com>
 <20110512.150132.1679483014638599288.davem@davemloft.net>
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On Thu, May 12, 2011 at 03:01:32PM -0400, David Miller wrote:
> From: Dave Jones <davej@redhat.com>
> Date: Thu, 12 May 2011 14:37:41 -0400
> 
> > On Thu, May 12, 2011 at 02:06:30PM -0400, David Miller wrote:
> >  > I hate this too, and I think it's absolutely rediculous.
> >  > 
> >  > Also, like you, I lost an entire afternoon trying to figure out why
> >  > this started happening.
> >  > 
> >  > I wish we could revert this change.
> > 
> > At least it can be permanently disabled..
> > 
> > echo kernel.kptr_restrict = 0 >> /etc/sysctl.conf
> 
> Regardless, what to do about all of the "perf is broken" reports?

The problem is that they turned it on by default.

	int kptr_restrict = 1;
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