linux-kernel - Re: Linux 2.6.32.34

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Message-ID: <20110324073009.GB3783@elte.hu>
Date:	Thu, 24 Mar 2011 08:30:09 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Greg KH <gregkh@...e.de>
Cc:	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, stable@...nel.org, lwn@....net,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Slaby <jirislaby@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: Linux 2.6.32.34


* Greg KH <gregkh@...e.de> wrote:

> On Thu, Mar 24, 2011 at 01:18:17AM +0100, Jiri Slaby wrote:
> > On 03/23/2011 09:34 PM, Greg KH wrote:
> > > --- a/kernel/perf_event.c
> > > +++ b/kernel/perf_event.c
> > > @@ -4167,6 +4167,8 @@ static void tp_perf_event_destroy(struct perf_event *event)
> > >  
> > >  static const struct pmu *tp_perf_event_init(struct perf_event *event)
> > >  {
> > > +	if (event->hw.state & PERF_HES_STOPPED)
> > > +		return 0;
> > >  	/*
> > >  	 * Raw tracepoint data is a severe data leak, only allow root to
> > >  	 * have these.
> > 
> > This causes build to fail:
> > /usr/src/packages/BUILD/kernel-vanilla-2.6.32.34/linux-2.6.32/kernel/perf_event.c:
> >  In function 'tp_perf_event_init':
> > /usr/src/packages/BUILD/kernel-vanilla-2.6.32.34/linux-2.6.32/kernel/perf_event.c:4170:
> >  error: 'struct hw_perf_event' has no member named 'state'
> > /usr/src/packages/BUILD/kernel-vanilla-2.6.32.34/linux-2.6.32/kernel/perf_event.c:4170:
> >  error: 'PERF_HES_STOPPED' undeclared (first use in this function)
> > /usr/src/packages/BUILD/kernel-vanilla-2.6.32.34/linux-2.6.32/kernel/perf_event.c:4170:
> >  error: (Each undeclared identifier is reported only once
> > /usr/src/packages/BUILD/kernel-vanilla-2.6.32.34/linux-2.6.32/kernel/perf_event.c:4170:
> >  error: for each function it appears in.)
> > 
> > 
> > The source:
> > commit 6f197b73304b3bd3d5a43b931383a5331d6b2987
> > Author: Frederic Weisbecker <fweisbec@...il.com>
> > Date:   Mon Mar 7 21:27:09 2011 +0100
> > 
> >     perf: Handle stopped state with tracepoints
> > 
> >     commit a0f7d0f7fc02465bb9758501f611f63381792996 upstream.
> > 
> >     We toggle the state from start and stop callbacks but actually
> >     don't check it when the event triggers. Do it so that
> >     these callbacks actually work.
> 
> Ick, I don't know why it builds fine here.  Federic, should I just drop
> this patch for the .32 tree?

Yes, please drop it.

Thanks,

	Ingo
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