Patch "perf: Fix inherited events vs. tracepoint filters" has been added to the 3.14-stable tree

Patch "perf: Fix inherited events vs. tracepoint filters" has been added to the 3.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    perf: Fix inherited events vs. tracepoint filters

to the 3.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     perf-fix-inherited-events-vs.-tracepoint-filters.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From b71b437eedaed985062492565d9d421d975ae845 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@infradead.org>
Date: Mon, 2 Nov 2015 10:50:51 +0100
Subject: perf: Fix inherited events vs. tracepoint filters
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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From: Peter Zijlstra <peterz@infradead.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@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/20151102095051.GN17308@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 kernel/events/core.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5945,6 +5945,10 @@ 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;


Patches currently in stable-queue which might be from peterz@infradead.org are

queue-3.14/futex-drop-refcount-if-requeue_pi-acquired-the-rtmutex.patch
queue-3.14/perf-fix-inherited-events-vs.-tracepoint-filters.patch