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tracing: Clean up alloc_synth_event()

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alloc_synth_event() currently has the following code to initialize the
event fields and dynamic_fields:

	for (i = 0, j = 0; i < n_fields; i++) {
		event->fields[i] = fields[i];

		if (fields[i]->is_dynamic) {
			event->dynamic_fields[j] = fields[i];
			event->dynamic_fields[j]->field_pos = i;
			event->dynamic_fields[j++] = fields[i];
			event->n_dynamic_fields++;
		}
	}

1) It would make more sense to have all fields keep track of their
   field_pos.

2) event->dynmaic_fields[j] is assigned twice for no reason.

3) We can move updating event->n_dynamic_fields outside the loop, and just
   assign it to j.

This combination makes the code much cleaner.

Link: https://lkml.kernel.org/r/20210721195341.29bb0f77@oasis.local.home

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2021-07-21 19:53:41 -04:00
parent 1e3bac71c5
commit 9528c19507
1 changed files with 3 additions and 5 deletions
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8
kernel/trace/trace_events_synth.c
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@ -893,15 +893,13 @@ static struct synth_event *alloc_synth_event(const char *name, int n_fields,
dyn_event_init(&event->devent, &synth_event_ops);
for (i = 0, j = 0; i < n_fields; i++) {
fields[i]->field_pos = i;
event->fields[i] = fields[i];
if (fields[i]->is_dynamic) {
event->dynamic_fields[j] = fields[i];
event->dynamic_fields[j]->field_pos = i;
if (fields[i]->is_dynamic)
event->dynamic_fields[j++] = fields[i];
event->n_dynamic_fields++;
}
}
event->n_dynamic_fields = j;
event->n_fields = n_fields;
out:
return event;