[tip:perf/core] perf: Fix group moving

[tip-bot for Peter Zijlstra <a.p.zijlstra@chello.nl>]

Commit-ID:  74c3337c2fc6389d3a57a622a936036b6db6b2e8
Gitweb:     http://git.kernel.org/tip/74c3337c2fc6389d3a57a622a936036b6db6b2e8
Author:     Peter Zijlstra <a.p.zijlstra@chello.nl>
AuthorDate: Fri, 15 Oct 2010 11:40:29 +0200
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Mon, 18 Oct 2010 19:58:51 +0200

perf: Fix group moving

Matt found we trigger the WARN_ON_ONCE() in perf_group_attach() when we take
the move_group path in perf_event_open().

Since we cannot de-construct the group (we rely on it to move the events), we
have to simply ignore the double attach. The group state is context invariant
and doesn't need changing.

Reported-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1287135757.29097.1368.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 kernel/perf_event.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 99b9700..346dc0e 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -315,7 +315,12 @@ static void perf_group_attach(struct perf_event *event)
 {
 	struct perf_event *group_leader = event->group_leader;
 
-	WARN_ON_ONCE(event->attach_state & PERF_ATTACH_GROUP);
+	/*
+	 * We can have double attach due to group movement in perf_event_open.
+	 */
+	if (event->attach_state & PERF_ATTACH_GROUP)
+		return;
+
 	event->attach_state |= PERF_ATTACH_GROUP;
 
 	if (group_leader == event)