Need a tracepoint_synchronize_unregister() before the end of exit() to make sure every probe callers have exited the non preemptible section and thus are not executing the probe code anymore. Impact: bugfix. Signed-off-by: Mathieu Desnoyers CC: Rusty Russell CC: "Frank Ch. Eigler" CC: 'Ingo Molnar' CC: Lai Jiangshan CC: Peter Zijlstra CC: Steven Rostedt --- samples/tracepoints/tracepoint-probe-sample.c | 1 + samples/tracepoints/tracepoint-probe-sample2.c | 1 + 2 files changed, 2 insertions(+) Index: linux-2.6-lttng/samples/tracepoints/tracepoint-probe-sample.c =================================================================== --- linux-2.6-lttng.orig/samples/tracepoints/tracepoint-probe-sample.c 2008-07-31 09:26:51.000000000 -0400 +++ linux-2.6-lttng/samples/tracepoints/tracepoint-probe-sample.c 2008-07-31 09:26:52.000000000 -0400 @@ -46,6 +46,7 @@ void __exit tp_sample_trace_exit(void) { unregister_trace_subsys_eventb(probe_subsys_eventb); unregister_trace_subsys_event(probe_subsys_event); + tracepoint_synchronize_unregister(); } module_exit(tp_sample_trace_exit); Index: linux-2.6-lttng/samples/tracepoints/tracepoint-probe-sample2.c =================================================================== --- linux-2.6-lttng.orig/samples/tracepoints/tracepoint-probe-sample2.c 2008-07-31 09:26:51.000000000 -0400 +++ linux-2.6-lttng/samples/tracepoints/tracepoint-probe-sample2.c 2008-07-31 09:26:52.000000000 -0400 @@ -33,6 +33,7 @@ module_init(tp_sample_trace_init); void __exit tp_sample_trace_exit(void) { unregister_trace_subsys_event(probe_subsys_event); + tracepoint_synchronize_unregister(); } module_exit(tp_sample_trace_exit); -- Mathieu Desnoyers OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/