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tracing: handle unregistering the current tracer 

Impact: simplification

Instead of requiring that plugins have the sequence:

  my_tracer_stop(my_trace_array);
  unregister_tracer(my_tracer);

it should be possible just do a:

  unregister_tracer(my_tracer);

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arnaldo Carvalho de Melo 2009-02-07 18:52:59 -02:00 committed by Ingo Molnar
parent 3861a17bcc
commit b5db03c435
1 changed files with 9 additions and 0 deletions
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9
kernel/trace/trace.c
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@ -559,6 +559,15 @@ void unregister_tracer(struct tracer *type)
found:
*t = (*t)->next;
if (type == current_trace && tracer_enabled) {
tracer_enabled = 0;
tracing_stop();
if (current_trace->stop)
current_trace->stop(&global_trace);
current_trace = &nop_trace;
}
if (strlen(type->name) != max_tracer_type_len)
goto out;