linux-kernel - [29/44] perf: Handle stopped state with tracepoints

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Message-Id: <20110321231053.660790916@clark.kroah.org>
Date:	Mon, 21 Mar 2011 16:10:09 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Subject: [29/44] perf: Handle stopped state with tracepoints

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Frederic Weisbecker <fweisbec@...il.com>

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.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Stephane Eranian <eranian@...gle.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <1299529629-18280-2-git-send-email-fweisbec@...il.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 kernel/perf_event.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -4167,6 +4167,8 @@ static void tp_perf_event_destroy(struct
 
 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.


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