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authorJason Baron <jbaron@redhat.com>2009-08-10 16:52:27 -0400
committerFrederic Weisbecker <fweisbec@gmail.com>2009-08-11 20:35:26 +0200
commit63fbdab3157b72467013fe4dcf88c85e45280ef7 (patch)
treec0e8647e18528dca9682e98a441729adfa41696c /include/linux/tracepoint.h
parent066e0378c23f0a3db730893f6a041e4a3922a385 (diff)
tracing: Add DECLARE_TRACE_WITH_CALLBACK() macro
Introduce a new 'DECLARE_TRACE_WITH_CALLBACK()' macro, so that tracepoints can associate an external register/unregister function. This prepares for the syscalls tracer conversion to trace events. We will need to perform arch level operations once a syscall event is turned on/off, such as TIF flags setting, hence the need of such specific callbacks. Signed-off-by: Jason Baron <jbaron@redhat.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Jiaying Zhang <jiayingz@google.com> Cc: Martin Bligh <mbligh@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Masami Hiramatsu <mhiramat@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'include/linux/tracepoint.h')
-rw-r--r--include/linux/tracepoint.h31
1 files changed, 27 insertions, 4 deletions
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index b9dc4ca0246f..5984ed04c03b 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -60,8 +60,10 @@ struct tracepoint {
* Make sure the alignment of the structure in the __tracepoints section will
* not add unwanted padding between the beginning of the section and the
* structure. Force alignment to the same alignment as the section start.
+ * An optional set of (un)registration functions can be passed to perform any
+ * additional (un)registration work.
*/
-#define DECLARE_TRACE(name, proto, args) \
+#define DECLARE_TRACE_WITH_CALLBACK(name, proto, args, reg, unreg) \
extern struct tracepoint __tracepoint_##name; \
static inline void trace_##name(proto) \
{ \
@@ -71,13 +73,30 @@ struct tracepoint {
} \
static inline int register_trace_##name(void (*probe)(proto)) \
{ \
- return tracepoint_probe_register(#name, (void *)probe); \
+ int ret; \
+ void (*func)(void) = reg; \
+ \
+ ret = tracepoint_probe_register(#name, (void *)probe); \
+ if (func && !ret) \
+ func(); \
+ return ret; \
} \
static inline int unregister_trace_##name(void (*probe)(proto)) \
{ \
- return tracepoint_probe_unregister(#name, (void *)probe);\
+ int ret; \
+ void (*func)(void) = unreg; \
+ \
+ ret = tracepoint_probe_unregister(#name, (void *)probe);\
+ if (func && !ret) \
+ func(); \
+ return ret; \
}
+
+#define DECLARE_TRACE(name, proto, args) \
+ DECLARE_TRACE_WITH_CALLBACK(name, TP_PROTO(proto), TP_ARGS(args),\
+ NULL, NULL);
+
#define DEFINE_TRACE(name) \
static const char __tpstrtab_##name[] \
__attribute__((section("__tracepoints_strings"))) = #name; \
@@ -94,7 +113,7 @@ extern void tracepoint_update_probe_range(struct tracepoint *begin,
struct tracepoint *end);
#else /* !CONFIG_TRACEPOINTS */
-#define DECLARE_TRACE(name, proto, args) \
+#define DECLARE_TRACE_WITH_CALLBACK(name, proto, args, reg, unreg) \
static inline void _do_trace_##name(struct tracepoint *tp, proto) \
{ } \
static inline void trace_##name(proto) \
@@ -108,6 +127,10 @@ extern void tracepoint_update_probe_range(struct tracepoint *begin,
return -ENOSYS; \
}
+#define DECLARE_TRACE(name, proto, args) \
+ DECLARE_TRACE_WITH_CALLBACK(name, TP_PROTO(proto), TP_ARGS(args),\
+ NULL, NULL);
+
#define DEFINE_TRACE(name)
#define EXPORT_TRACEPOINT_SYMBOL_GPL(name)
#define EXPORT_TRACEPOINT_SYMBOL(name)