trace: assign defaults at register_ftrace_event
Impact: simplification of tracers As all tracers are doing this we might as well do it in register_ftrace_event and save one branch each time we call these callbacks. Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com> Acked-by: NFrederic Weisbecker <fweisbec@gmail.com> Acked-by: NSteven Rostedt <srostedt@redhat.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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