linux-kernel - Re: Linux 2.6.32.34

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Date:	Wed, 23 Mar 2011 19:51:33 -0700
From:	Greg KH <gregkh@...e.de>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	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>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Linux 2.6.32.34

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?

thanks,

greg k-h
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