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Commit 63fbdab3 authored by Jason Baron's avatar Jason Baron Committed by Frederic Weisbecker
Browse files

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: default avatarJason 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: default avatarFrederic Weisbecker <fweisbec@gmail.com>
parent 066e0378

include/linux/tracepoint.h

+27 −4
Original line number Diff line number Diff line
@@ -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)