src/patches/suse-2.6.27.25/patches.trace/tracepoints-samples-fix-teardown.patch

   1 From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
   2 Subject: Tracepoints : Samples fix teardown
   3
   4 Need a tracepoint_synchronize_unregister() before the end of exit() to make sure
   5 every probe callers have exited the non preemptible section and thus are not
   6 executing the probe code anymore.
   7
   8 Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
   9 CC: Rusty Russell <rusty@rustcorp.com.au>
  10 CC: "Frank Ch. Eigler" <fche@redhat.com>
  11 CC: Ingo Molnar <mingo@elte.hu>
  12 CC: Peter Zijlstra <peterz@infradead.org>
  13 CC: Steven Rostedt <rostedt@goodmis.org>
  14 Acked-by: Jan Blunck <jblunck@suse.de>
  15 ---
  16  samples/tracepoints/tracepoint-probe-sample.c  |    1 +
  17  samples/tracepoints/tracepoint-probe-sample2.c |    1 +
  18  2 files changed, 2 insertions(+)
  19
  20 Index: linux-2.6-lttng/samples/tracepoints/tracepoint-probe-sample.c
  21 ===================================================================
  22 --- linux-2.6-lttng.orig/samples/tracepoints/tracepoint-probe-sample.c  2008-07-31 09:26:51.000000000 -0400
  23 +++ linux-2.6-lttng/samples/tracepoints/tracepoint-probe-sample.c       2008-07-31 09:26:52.000000000 -0400
  24 @@ -46,6 +46,7 @@ void __exit tp_sample_trace_exit(void)
  25  {
  26         unregister_trace_subsys_eventb(probe_subsys_eventb);
  27         unregister_trace_subsys_event(probe_subsys_event);
  28 +       tracepoint_synchronize_unregister();
  29  }
  30
  31  module_exit(tp_sample_trace_exit);
  32 Index: linux-2.6-lttng/samples/tracepoints/tracepoint-probe-sample2.c
  33 ===================================================================
  34 --- linux-2.6-lttng.orig/samples/tracepoints/tracepoint-probe-sample2.c 2008-07-31 09:26:51.000000000 -0400
  35 +++ linux-2.6-lttng/samples/tracepoints/tracepoint-probe-sample2.c      2008-07-31 09:26:52.000000000 -0400
  36 @@ -33,6 +33,7 @@ module_init(tp_sample_trace_init);
  37  void __exit tp_sample_trace_exit(void)
  38  {
  39         unregister_trace_subsys_event(probe_subsys_event);
  40 +       tracepoint_synchronize_unregister();
  41  }
  42
  43  module_exit(tp_sample_trace_exit);