greybus: tracing: add module traces
Define a new gb_module trace point event class, used to trace events associated with the module abstraction. Define four basic trace points for this--creation time, drop of last reference, before registring interfaces and after de-registering them. Signed-off-by: Alex Elder <elder@linaro.org> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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