[PATCH v4 5/6] rtla: Unconditionally clean any pre-existing filters for user-provided events

[Valentin Schneider <vschneid@redhat.com>]

A later commit will apply a filter to events recorded to the trace
output. To prevent any user confusion, remove pre-existing filters when
enabling an event provided via the '-e' command line argument.

Suggested-by: Tomas Glozar <tglozar@redhat.com>
Signed-off-by: Valentin Schneider <vschneid@redhat.com>
---
 tools/tracing/rtla/src/trace.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/tracing/rtla/src/trace.c b/tools/tracing/rtla/src/trace.c
index e407447773d04..f67f02cc92cdd 100644
--- a/tools/tracing/rtla/src/trace.c
+++ b/tools/tracing/rtla/src/trace.c
@@ -473,6 +473,10 @@ static int trace_event_enable_filter(struct trace_instance *instance,
 	char filter[MAX_PATH];
 	int retval;
 
+	/* Unconditionally clean any pre-existing filters */
+	tracefs_event_file_write(instance->inst, tevent->system,
+				 tevent->event, "filter", "0");
+
 	if (!tevent->filter)
 		return 0;
 
-- 
2.55.0