Distinguish init/reset and start/stop:
init/reset will allocate and release bts tracing resources
stop/start will suspend and resume bts tracing
Return an error on init() if no cpu can be traced.
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
LKML-Reference: <20090313104852.A30168@sedona.ch.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>