tracing: convert c/p state power tracer to use tracepoints
Convert the c/p state "power" tracer to use tracepoints. Avoids a function call when the tracer is disabled. Signed-off-by: NJason Baron <jbaron@redhat.com> Acked-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NSteven Rostedt <srostedt@redhat.com>
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