src/patches/suse-2.6.27.25/patches.trace/tracepoints-tracepoint-synchronize-unregister.patch

   1 From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
   2 Subject: Tracepoints : tracepoint_synchronize_unregister()
   3
   4 Create tracepoint_synchronize_unregister() which must be called before the end
   5 of exit() to make sure every probe callers have exited the non preemptible
   6 section and thus are not 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  include/linux/tracepoint.h |    7 +++++++
  17  1 file changed, 7 insertions(+)
  18
  19 Index: linux-2.6-lttng/include/linux/tracepoint.h
  20 ===================================================================
  21 --- linux-2.6-lttng.orig/include/linux/tracepoint.h     2008-07-31 09:21:40.000000000 -0400
  22 +++ linux-2.6-lttng/include/linux/tracepoint.h  2008-07-31 09:22:27.000000000 -0400
  23 @@ -124,4 +124,11 @@ extern void tracepoint_iter_reset(struct
  24  extern int tracepoint_get_iter_range(struct tracepoint **tracepoint,
  25         struct tracepoint *begin, struct tracepoint *end);
  26
  27 +/*
  28 + * tracepoint_synchronize_unregister must be called between the last tracepoint
  29 + * probe unregistration and the end of module exit to make sure there is no
  30 + * caller executing a probe when it is freed.
  31 + */
  32 +#define tracepoint_synchronize_unregister() synchronize_sched()
  33 +
  34  #endif