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tracing: Have traceon and traceoff trigger honor the instance

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commit 302e9edd54 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@vger.kernel.org
Fixes: ae63b31e4d ("tracing: Separate out trace events from global variables")
Tested-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Steven Rostedt (Google) 2022-02-23 22:38:37 -05:00 • committed by Greg Kroah-Hartman
commit afbeee13be
1 changed files with 46 additions and 6 deletions
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52
kernel/trace/trace_events_trigger.c
View file

@ -940,6 +940,16 @@ static void
traceon_trigger(struct event_trigger_data *data, void *rec,
struct ring_buffer_event *event)
{
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;
@ -950,8 +960,15 @@ static void
traceon_count_trigger(struct event_trigger_data *data, void *rec,
struct ring_buffer_event *event)
{
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;
@ -959,13 +976,26 @@ traceon_count_trigger(struct event_trigger_data *data, void *rec,
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 ring_buffer_event *event)
{
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;
@ -976,8 +1006,15 @@ static void
traceoff_count_trigger(struct event_trigger_data *data, void *rec,
struct ring_buffer_event *event)
{
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;
@ -985,7 +1022,10 @@ traceoff_count_trigger(struct event_trigger_data *data, void *rec,
if (data->count != -1)
(data->count)--;
tracing_off();
if (file)
tracer_tracing_off(file->tr);
else
tracing_off();
}
static int