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From: Frederic Weisbecker on 1 Aug 2010 20:20
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(a)gmail.com>
Cc: Ingo Molnar <mingo(a)elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra(a)chello.nl>
Cc: Arnaldo Carvalho de Melo <acme(a)redhat.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers(a)polymtl.ca>
Cc: Steven Rostedt <rostedt(a)goodmis.org>
Cc: Li Zefan <lizf(a)cn.fujitsu.com>
---
kernel/trace/trace_event_perf.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 2375165..000e6e8 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -131,10 +131,10 @@ void perf_trace_destroy(struct perf_event *p_event)
tp_event->class->reg(tp_event, TRACE_REG_PERF_UNREGISTER);

/*
- * Ensure our callback won't be called anymore. See
- * tracepoint_probe_unregister() and __DO_TRACE().
+ * Ensure our callback won't be called anymore. The buffers
+ * will be freed after that.
*/
- synchronize_sched();
+ tracepoint_synchronize_unregister();

free_percpu(tp_event->perf_events);
tp_event->perf_events = NULL;
--
1.6.2.3

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