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authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>2008-10-06 10:33:00 -0400
committerIngo Molnar <mingo@elte.hu>2008-10-14 10:39:30 +0200
commitf2461fc82a083dd60062e05e704c5fcc1c658ba1 (patch)
tree1b5e13fd4895351d26e9bd4a404c40c8d8381a09
parent8b27386a9ce9c7f0f8702cff7565a46802ad57d1 (diff)
tracepoints: tracepoint_synchronize_unregister()
Create tracepoint_synchronize_unregister() which must be called 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. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--include/linux/tracepoint.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index e623a6fca5c3..199f4c207c1e 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -124,4 +124,11 @@ extern void tracepoint_iter_reset(struct tracepoint_iter *iter);
extern int tracepoint_get_iter_range(struct tracepoint **tracepoint,
struct tracepoint *begin, struct tracepoint *end);
+/*
+ * tracepoint_synchronize_unregister must be called between the last tracepoint
+ * probe unregistration and the end of module exit to make sure there is no
+ * caller executing a probe when it is freed.
+ */
+#define tracepoint_synchronize_unregister() synchronize_sched()
+
#endif

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