perf: Use tracepoint_synchronize_unregister() to flush any pending tracepoint call
We use synchronize_sched() to ensure a tracepoint won't be called while/after we release the perf buffers it references. But the tracepoint API has its own API for that: tracepoint_synchronize_unregister(). Use it instead as it's self-explanatory and eases maintainance. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Li Zefan <lizf@cn.fujitsu.com>
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@ -131,10 +131,10 @@ void perf_trace_destroy(struct perf_event *p_event)
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tp_event->class->reg(tp_event, TRACE_REG_PERF_UNREGISTER);
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/*
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* Ensure our callback won't be called anymore. See
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* tracepoint_probe_unregister() and __DO_TRACE().
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* Ensure our callback won't be called anymore. The buffers
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* will be freed after that.
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*/
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synchronize_sched();
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tracepoint_synchronize_unregister();
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free_percpu(tp_event->perf_events);
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tp_event->perf_events = NULL;
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