linux-kernel - [PATCH 4.14 03/43] tracing: Have traceon and traceoff trigger honor the instance

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Message-Id: <20220426081734.615461663@linuxfoundation.org>
Date:   Tue, 26 Apr 2022 10:20:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Daniel Bristot de Oliveira <bristot@...nel.org>,
        Tom Zanussi <zanussi@...nel.org>,
        "Steven Rostedt (Google)" <rostedt@...dmis.org>
Subject: [PATCH 4.14 03/43] tracing: Have traceon and traceoff trigger honor the instance

From: Steven Rostedt (Google) <rostedt@...dmis.org>

commit 302e9edd54985f584cfc180098f3554774126969 upstream.

If a trigger is set on an event to disable or enable tracing within an
instance, then tracing should be disabled or enabled in the instance and
not at the top level, which is confusing to users.

Link: https://lkml.kernel.org/r/20220223223837.14f94ec3@rorschach.local.home

Cc: stable@...r.kernel.org
Fixes: ae63b31e4d0e2 ("tracing: Separate out trace events from global variables")
Tested-by: Daniel Bristot de Oliveira <bristot@...nel.org>
Reviewed-by: Tom Zanussi <zanussi@...nel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 kernel/trace/trace_events_trigger.c |   52 +++++++++++++++++++++++++++++++-----
 1 file changed, 46 insertions(+), 6 deletions(-)

--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -932,6 +932,16 @@ void set_named_trigger_data(struct event
 static void
 traceon_trigger(struct event_trigger_data *data, void *rec)
 {
+	struct trace_event_file *file = data->private_data;
+
+	if (file) {
+		if (tracer_tracing_is_on(file->tr))
+			return;
+
+		tracer_tracing_on(file->tr);
+		return;
+	}
+
 	if (tracing_is_on())
 		return;
 
@@ -941,8 +951,15 @@ traceon_trigger(struct event_trigger_dat
 static void
 traceon_count_trigger(struct event_trigger_data *data, void *rec)
 {
-	if (tracing_is_on())
-		return;
+	struct trace_event_file *file = data->private_data;
+
+	if (file) {
+		if (tracer_tracing_is_on(file->tr))
+			return;
+	} else {
+		if (tracing_is_on())
+			return;
+	}
 
 	if (!data->count)
 		return;
@@ -950,12 +967,25 @@ traceon_count_trigger(struct event_trigg
 	if (data->count != -1)
 		(data->count)--;
 
-	tracing_on();
+	if (file)
+		tracer_tracing_on(file->tr);
+	else
+		tracing_on();
 }
 
 static void
 traceoff_trigger(struct event_trigger_data *data, void *rec)
 {
+	struct trace_event_file *file = data->private_data;
+
+	if (file) {
+		if (!tracer_tracing_is_on(file->tr))
+			return;
+
+		tracer_tracing_off(file->tr);
+		return;
+	}
+
 	if (!tracing_is_on())
 		return;
 
@@ -965,8 +995,15 @@ traceoff_trigger(struct event_trigger_da
 static void
 traceoff_count_trigger(struct event_trigger_data *data, void *rec)
 {
-	if (!tracing_is_on())
-		return;
+	struct trace_event_file *file = data->private_data;
+
+	if (file) {
+		if (!tracer_tracing_is_on(file->tr))
+			return;
+	} else {
+		if (!tracing_is_on())
+			return;
+	}
 
 	if (!data->count)
 		return;
@@ -974,7 +1011,10 @@ traceoff_count_trigger(struct event_trig
 	if (data->count != -1)
 		(data->count)--;
 
-	tracing_off();
+	if (file)
+		tracer_tracing_off(file->tr);
+	else
+		tracing_off();
 }
 
 static int