linux-kernel - [PATCH 3.2 36/52] perf: Fix inherited events vs. tracepoint filters

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Message-ID: <lsq.1448404439.948984395@decadent.org.uk>
Date:	Tue, 24 Nov 2015 22:33:59 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Thomas Gleixner" <tglx@...utronix.de>,
	"Arnaldo Carvalho de Melo" <acme@...nel.org>,
	"Jiri Olsa" <jolsa@...hat.com>,
	"Frédéric Weisbecker" <fweisbec@...il.com>,
	"Ingo Molnar" <mingo@...nel.org>,
	"David Ahern" <dsahern@...il.com>, "Jiri Olsa" <jolsa@...nel.org>,
	"Adrian Hunter" <adrian.hunter@...el.com>,
	"Arnaldo Carvalho de Melo" <acme@...hat.com>,
	"Steven Rostedt" <rostedt@...dmis.org>,
	"Wang Nan" <wangnan0@...wei.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Peter Zijlstra" <peterz@...radead.org>
Subject: [PATCH 3.2 36/52] perf: Fix inherited events vs. tracepoint filters

3.2.74-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Peter Zijlstra <peterz@...radead.org>

commit b71b437eedaed985062492565d9d421d975ae845 upstream.

Arnaldo reported that tracepoint filters seem to misbehave (ie. not
apply) on inherited events.

The fix is obvious; filters are only set on the actual (parent)
event, use the normal pattern of using this parent event for filters.
This is safe because each child event has a reference to it.

Reported-by: Arnaldo Carvalho de Melo <acme@...nel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@...nel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Frédéric Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/r/20151102095051.GN17308@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 kernel/events/core.c | 4 ++++
 1 file changed, 4 insertions(+)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5393,6 +5393,10 @@ static int perf_tp_filter_match(struct p
 {
 	void *record = data->raw->data;
 
+	/* only top level events have filters set */
+	if (event->parent)
+		event = event->parent;
+
 	if (likely(!event->filter) || filter_match_preds(event->filter, record))
 		return 1;
 	return 0;

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