 92e51938f5
			
		
	
	
	92e51938f5
	
	
	
		
			
			Each event adds some points to its counters. By default it adds 1, and a number of points may be transmited in event's parameters. E.g. sched:sched_stat_runtime adds how long process has been running. But this functionality was broken by v2.6.31-rc5-392-gf413cdb and now the event's parameters doesn't affect on a number of points. TP_perf_assign isn't defined, so __perf_count(c) isn't executed and __count is always equal to 1. Signed-off-by: Andrew Vagin <avagin@openvz.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1317052535-1765247-2-git-send-email-avagin@openvz.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
		
			
				
	
	
		
			778 lines
		
	
	
	
		
			22 KiB
			
		
	
	
	
		
			C
		
	
	
	
	
	
			
		
		
	
	
			778 lines
		
	
	
	
		
			22 KiB
			
		
	
	
	
		
			C
		
	
	
	
	
	
| /*
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|  * Stage 1 of the trace events.
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|  *
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|  * Override the macros in <trace/trace_events.h> to include the following:
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|  *
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|  * struct ftrace_raw_<call> {
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|  *	struct trace_entry		ent;
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|  *	<type>				<item>;
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|  *	<type2>				<item2>[<len>];
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|  *	[...]
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|  * };
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|  *
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|  * The <type> <item> is created by the __field(type, item) macro or
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|  * the __array(type2, item2, len) macro.
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|  * We simply do "type item;", and that will create the fields
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|  * in the structure.
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|  */
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| 
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| #include <linux/ftrace_event.h>
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| 
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| /*
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|  * DECLARE_EVENT_CLASS can be used to add a generic function
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|  * handlers for events. That is, if all events have the same
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|  * parameters and just have distinct trace points.
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|  * Each tracepoint can be defined with DEFINE_EVENT and that
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|  * will map the DECLARE_EVENT_CLASS to the tracepoint.
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|  *
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|  * TRACE_EVENT is a one to one mapping between tracepoint and template.
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|  */
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| #undef TRACE_EVENT
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| #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
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| 	DECLARE_EVENT_CLASS(name,			       \
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| 			     PARAMS(proto),		       \
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| 			     PARAMS(args),		       \
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| 			     PARAMS(tstruct),		       \
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| 			     PARAMS(assign),		       \
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| 			     PARAMS(print));		       \
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| 	DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
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| 
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| 
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| #undef __field
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| #define __field(type, item)		type	item;
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| 
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| #undef __field_ext
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| #define __field_ext(type, item, filter_type)	type	item;
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| 
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| #undef __array
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| #define __array(type, item, len)	type	item[len];
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| 
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| #undef __dynamic_array
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| #define __dynamic_array(type, item, len) u32 __data_loc_##item;
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| 
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| #undef __string
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| #define __string(item, src) __dynamic_array(char, item, -1)
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| 
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| #undef TP_STRUCT__entry
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| #define TP_STRUCT__entry(args...) args
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| 
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| #undef DECLARE_EVENT_CLASS
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| #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)	\
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| 	struct ftrace_raw_##name {					\
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| 		struct trace_entry	ent;				\
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| 		tstruct							\
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| 		char			__data[0];			\
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| 	};								\
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| 									\
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| 	static struct ftrace_event_class event_class_##name;
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| 
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| #undef DEFINE_EVENT
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| #define DEFINE_EVENT(template, name, proto, args)	\
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| 	static struct ftrace_event_call	__used		\
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| 	__attribute__((__aligned__(4))) event_##name
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| 
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| #undef DEFINE_EVENT_PRINT
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| #define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
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| 	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
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| 
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| /* Callbacks are meaningless to ftrace. */
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| #undef TRACE_EVENT_FN
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| #define TRACE_EVENT_FN(name, proto, args, tstruct,			\
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| 		assign, print, reg, unreg)				\
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| 	TRACE_EVENT(name, PARAMS(proto), PARAMS(args),			\
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| 		PARAMS(tstruct), PARAMS(assign), PARAMS(print))		\
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| 
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| #undef TRACE_EVENT_FLAGS
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| #define TRACE_EVENT_FLAGS(name, value)					\
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| 	__TRACE_EVENT_FLAGS(name, value)
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| 
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| #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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| 
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| 
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| /*
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|  * Stage 2 of the trace events.
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|  *
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|  * Include the following:
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|  *
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|  * struct ftrace_data_offsets_<call> {
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|  *	u32				<item1>;
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|  *	u32				<item2>;
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|  *	[...]
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|  * };
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|  *
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|  * The __dynamic_array() macro will create each u32 <item>, this is
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|  * to keep the offset of each array from the beginning of the event.
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|  * The size of an array is also encoded, in the higher 16 bits of <item>.
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|  */
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| 
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| #undef __field
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| #define __field(type, item)
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| 
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| #undef __field_ext
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| #define __field_ext(type, item, filter_type)
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| 
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| #undef __array
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| #define __array(type, item, len)
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| 
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| #undef __dynamic_array
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| #define __dynamic_array(type, item, len)	u32 item;
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| 
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| #undef __string
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| #define __string(item, src) __dynamic_array(char, item, -1)
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| 
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| #undef DECLARE_EVENT_CLASS
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| #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
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| 	struct ftrace_data_offsets_##call {				\
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| 		tstruct;						\
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| 	};
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| 
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| #undef DEFINE_EVENT
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| #define DEFINE_EVENT(template, name, proto, args)
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| 
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| #undef DEFINE_EVENT_PRINT
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| #define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
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| 	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
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| 
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| #undef TRACE_EVENT_FLAGS
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| #define TRACE_EVENT_FLAGS(event, flag)
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| 
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| #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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| 
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| /*
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|  * Stage 3 of the trace events.
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|  *
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|  * Override the macros in <trace/trace_events.h> to include the following:
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|  *
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|  * enum print_line_t
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|  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
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|  * {
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|  *	struct trace_seq *s = &iter->seq;
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|  *	struct ftrace_raw_<call> *field; <-- defined in stage 1
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|  *	struct trace_entry *entry;
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|  *	struct trace_seq *p = &iter->tmp_seq;
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|  *	int ret;
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|  *
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|  *	entry = iter->ent;
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|  *
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|  *	if (entry->type != event_<call>->event.type) {
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|  *		WARN_ON_ONCE(1);
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|  *		return TRACE_TYPE_UNHANDLED;
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|  *	}
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|  *
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|  *	field = (typeof(field))entry;
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|  *
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|  *	trace_seq_init(p);
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|  *	ret = trace_seq_printf(s, "%s: ", <call>);
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|  *	if (ret)
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|  *		ret = trace_seq_printf(s, <TP_printk> "\n");
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|  *	if (!ret)
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|  *		return TRACE_TYPE_PARTIAL_LINE;
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|  *
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|  *	return TRACE_TYPE_HANDLED;
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|  * }
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|  *
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|  * This is the method used to print the raw event to the trace
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|  * output format. Note, this is not needed if the data is read
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|  * in binary.
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|  */
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| 
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| #undef __entry
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| #define __entry field
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| 
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| #undef TP_printk
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| #define TP_printk(fmt, args...) fmt "\n", args
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| 
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| #undef __get_dynamic_array
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| #define __get_dynamic_array(field)	\
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| 		((void *)__entry + (__entry->__data_loc_##field & 0xffff))
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| 
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| #undef __get_str
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| #define __get_str(field) (char *)__get_dynamic_array(field)
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| 
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| #undef __print_flags
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| #define __print_flags(flag, delim, flag_array...)			\
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| 	({								\
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| 		static const struct trace_print_flags __flags[] =	\
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| 			{ flag_array, { -1, NULL }};			\
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| 		ftrace_print_flags_seq(p, delim, flag, __flags);	\
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| 	})
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| 
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| #undef __print_symbolic
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| #define __print_symbolic(value, symbol_array...)			\
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| 	({								\
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| 		static const struct trace_print_flags symbols[] =	\
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| 			{ symbol_array, { -1, NULL }};			\
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| 		ftrace_print_symbols_seq(p, value, symbols);		\
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| 	})
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| 
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| #undef __print_symbolic_u64
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| #if BITS_PER_LONG == 32
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| #define __print_symbolic_u64(value, symbol_array...)			\
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| 	({								\
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| 		static const struct trace_print_flags_u64 symbols[] =	\
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| 			{ symbol_array, { -1, NULL } };			\
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| 		ftrace_print_symbols_seq_u64(p, value, symbols);	\
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| 	})
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| #else
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| #define __print_symbolic_u64(value, symbol_array...)			\
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| 			__print_symbolic(value, symbol_array)
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| #endif
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| 
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| #undef __print_hex
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| #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
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| 
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| #undef DECLARE_EVENT_CLASS
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| #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
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| static notrace enum print_line_t					\
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| ftrace_raw_output_##call(struct trace_iterator *iter, int flags,	\
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| 			 struct trace_event *trace_event)		\
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| {									\
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| 	struct ftrace_event_call *event;				\
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| 	struct trace_seq *s = &iter->seq;				\
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| 	struct ftrace_raw_##call *field;				\
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| 	struct trace_entry *entry;					\
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| 	struct trace_seq *p = &iter->tmp_seq;				\
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| 	int ret;							\
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| 									\
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| 	event = container_of(trace_event, struct ftrace_event_call,	\
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| 			     event);					\
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| 									\
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| 	entry = iter->ent;						\
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| 									\
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| 	if (entry->type != event->event.type) {				\
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| 		WARN_ON_ONCE(1);					\
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| 		return TRACE_TYPE_UNHANDLED;				\
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| 	}								\
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| 									\
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| 	field = (typeof(field))entry;					\
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| 									\
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| 	trace_seq_init(p);						\
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| 	ret = trace_seq_printf(s, "%s: ", event->name);			\
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| 	if (ret)							\
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| 		ret = trace_seq_printf(s, print);			\
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| 	if (!ret)							\
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| 		return TRACE_TYPE_PARTIAL_LINE;				\
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| 									\
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| 	return TRACE_TYPE_HANDLED;					\
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| }									\
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| static struct trace_event_functions ftrace_event_type_funcs_##call = {	\
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| 	.trace			= ftrace_raw_output_##call,		\
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| };
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| 
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| #undef DEFINE_EVENT_PRINT
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| #define DEFINE_EVENT_PRINT(template, call, proto, args, print)		\
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| static notrace enum print_line_t					\
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| ftrace_raw_output_##call(struct trace_iterator *iter, int flags,	\
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| 			 struct trace_event *event)			\
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| {									\
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| 	struct trace_seq *s = &iter->seq;				\
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| 	struct ftrace_raw_##template *field;				\
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| 	struct trace_entry *entry;					\
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| 	struct trace_seq *p = &iter->tmp_seq;				\
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| 	int ret;							\
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| 									\
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| 	entry = iter->ent;						\
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| 									\
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| 	if (entry->type != event_##call.event.type) {			\
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| 		WARN_ON_ONCE(1);					\
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| 		return TRACE_TYPE_UNHANDLED;				\
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| 	}								\
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| 									\
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| 	field = (typeof(field))entry;					\
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| 									\
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| 	trace_seq_init(p);						\
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| 	ret = trace_seq_printf(s, "%s: ", #call);			\
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| 	if (ret)							\
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| 		ret = trace_seq_printf(s, print);			\
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| 	if (!ret)							\
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| 		return TRACE_TYPE_PARTIAL_LINE;				\
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| 									\
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| 	return TRACE_TYPE_HANDLED;					\
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| }									\
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| static struct trace_event_functions ftrace_event_type_funcs_##call = {	\
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| 	.trace			= ftrace_raw_output_##call,		\
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| };
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| 
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| #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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| 
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| #undef __field_ext
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| #define __field_ext(type, item, filter_type)				\
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| 	ret = trace_define_field(event_call, #type, #item,		\
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| 				 offsetof(typeof(field), item),		\
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| 				 sizeof(field.item),			\
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| 				 is_signed_type(type), filter_type);	\
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| 	if (ret)							\
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| 		return ret;
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| 
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| #undef __field
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| #define __field(type, item)	__field_ext(type, item, FILTER_OTHER)
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| 
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| #undef __array
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| #define __array(type, item, len)					\
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| 	do {								\
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| 		mutex_lock(&event_storage_mutex);			\
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| 		BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);			\
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| 		snprintf(event_storage, sizeof(event_storage),		\
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| 			 "%s[%d]", #type, len);				\
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| 		ret = trace_define_field(event_call, event_storage, #item, \
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| 				 offsetof(typeof(field), item),		\
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| 				 sizeof(field.item),			\
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| 				 is_signed_type(type), FILTER_OTHER);	\
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| 		mutex_unlock(&event_storage_mutex);			\
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| 		if (ret)						\
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| 			return ret;					\
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| 	} while (0);
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| 
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| #undef __dynamic_array
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| #define __dynamic_array(type, item, len)				       \
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| 	ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
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| 				 offsetof(typeof(field), __data_loc_##item),   \
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| 				 sizeof(field.__data_loc_##item),	       \
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| 				 is_signed_type(type), FILTER_OTHER);
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| 
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| #undef __string
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| #define __string(item, src) __dynamic_array(char, item, -1)
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| 
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| #undef DECLARE_EVENT_CLASS
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| #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)	\
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| static int notrace							\
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| ftrace_define_fields_##call(struct ftrace_event_call *event_call)	\
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| {									\
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| 	struct ftrace_raw_##call field;					\
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| 	int ret;							\
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| 									\
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| 	tstruct;							\
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| 									\
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| 	return ret;							\
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| }
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| 
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| #undef DEFINE_EVENT
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| #define DEFINE_EVENT(template, name, proto, args)
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| 
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| #undef DEFINE_EVENT_PRINT
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| #define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
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| 	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
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| 
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| #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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| 
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| /*
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|  * remember the offset of each array from the beginning of the event.
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|  */
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| 
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| #undef __entry
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| #define __entry entry
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| 
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| #undef __field
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| #define __field(type, item)
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| 
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| #undef __field_ext
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| #define __field_ext(type, item, filter_type)
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| 
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| #undef __array
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| #define __array(type, item, len)
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| 
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| #undef __dynamic_array
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| #define __dynamic_array(type, item, len)				\
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| 	__data_offsets->item = __data_size +				\
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| 			       offsetof(typeof(*entry), __data);	\
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| 	__data_offsets->item |= (len * sizeof(type)) << 16;		\
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| 	__data_size += (len) * sizeof(type);
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| 
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| #undef __string
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| #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
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| 
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| #undef DECLARE_EVENT_CLASS
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| #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
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| static inline notrace int ftrace_get_offsets_##call(			\
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| 	struct ftrace_data_offsets_##call *__data_offsets, proto)       \
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| {									\
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| 	int __data_size = 0;						\
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| 	struct ftrace_raw_##call __maybe_unused *entry;			\
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| 									\
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| 	tstruct;							\
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| 									\
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| 	return __data_size;						\
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| }
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| 
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| #undef DEFINE_EVENT
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| #define DEFINE_EVENT(template, name, proto, args)
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| 
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| #undef DEFINE_EVENT_PRINT
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| #define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
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| 	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
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| 
 | |
| #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 | |
| 
 | |
| /*
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|  * Stage 4 of the trace events.
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|  *
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|  * Override the macros in <trace/trace_events.h> to include the following:
 | |
|  *
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|  * For those macros defined with TRACE_EVENT:
 | |
|  *
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|  * static struct ftrace_event_call event_<call>;
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|  *
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|  * static void ftrace_raw_event_<call>(void *__data, proto)
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|  * {
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|  *	struct ftrace_event_call *event_call = __data;
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|  *	struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
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|  *	struct ring_buffer_event *event;
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|  *	struct ftrace_raw_<call> *entry; <-- defined in stage 1
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|  *	struct ring_buffer *buffer;
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|  *	unsigned long irq_flags;
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|  *	int __data_size;
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|  *	int pc;
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|  *
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|  *	local_save_flags(irq_flags);
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|  *	pc = preempt_count();
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|  *
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|  *	__data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
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|  *
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|  *	event = trace_current_buffer_lock_reserve(&buffer,
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|  *				  event_<call>->event.type,
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|  *				  sizeof(*entry) + __data_size,
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|  *				  irq_flags, pc);
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|  *	if (!event)
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|  *		return;
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|  *	entry	= ring_buffer_event_data(event);
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|  *
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|  *	{ <assign>; }  <-- Here we assign the entries by the __field and
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|  *			   __array macros.
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|  *
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|  *	if (!filter_current_check_discard(buffer, event_call, entry, event))
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|  *		trace_current_buffer_unlock_commit(buffer,
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|  *						   event, irq_flags, pc);
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|  * }
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|  *
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|  * static struct trace_event ftrace_event_type_<call> = {
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|  *	.trace			= ftrace_raw_output_<call>, <-- stage 2
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|  * };
 | |
|  *
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|  * static const char print_fmt_<call>[] = <TP_printk>;
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|  *
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|  * static struct ftrace_event_class __used event_class_<template> = {
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|  *	.system			= "<system>",
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|  *	.define_fields		= ftrace_define_fields_<call>,
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|  *	.fields			= LIST_HEAD_INIT(event_class_##call.fields),
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|  *	.raw_init		= trace_event_raw_init,
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|  *	.probe			= ftrace_raw_event_##call,
 | |
|  *	.reg			= ftrace_event_reg,
 | |
|  * };
 | |
|  *
 | |
|  * static struct ftrace_event_call event_<call> = {
 | |
|  *	.name			= "<call>",
 | |
|  *	.class			= event_class_<template>,
 | |
|  *	.event			= &ftrace_event_type_<call>,
 | |
|  *	.print_fmt		= print_fmt_<call>,
 | |
|  * };
 | |
|  * // its only safe to use pointers when doing linker tricks to
 | |
|  * // create an array.
 | |
|  * static struct ftrace_event_call __used
 | |
|  * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
 | |
|  *
 | |
|  */
 | |
| 
 | |
| #ifdef CONFIG_PERF_EVENTS
 | |
| 
 | |
| #define _TRACE_PERF_PROTO(call, proto)					\
 | |
| 	static notrace void						\
 | |
| 	perf_trace_##call(void *__data, proto);
 | |
| 
 | |
| #define _TRACE_PERF_INIT(call)						\
 | |
| 	.perf_probe		= perf_trace_##call,
 | |
| 
 | |
| #else
 | |
| #define _TRACE_PERF_PROTO(call, proto)
 | |
| #define _TRACE_PERF_INIT(call)
 | |
| #endif /* CONFIG_PERF_EVENTS */
 | |
| 
 | |
| #undef __entry
 | |
| #define __entry entry
 | |
| 
 | |
| #undef __field
 | |
| #define __field(type, item)
 | |
| 
 | |
| #undef __array
 | |
| #define __array(type, item, len)
 | |
| 
 | |
| #undef __dynamic_array
 | |
| #define __dynamic_array(type, item, len)				\
 | |
| 	__entry->__data_loc_##item = __data_offsets.item;
 | |
| 
 | |
| #undef __string
 | |
| #define __string(item, src) __dynamic_array(char, item, -1)       	\
 | |
| 
 | |
| #undef __assign_str
 | |
| #define __assign_str(dst, src)						\
 | |
| 	strcpy(__get_str(dst), src);
 | |
| 
 | |
| #undef TP_fast_assign
 | |
| #define TP_fast_assign(args...) args
 | |
| 
 | |
| #undef TP_perf_assign
 | |
| #define TP_perf_assign(args...)
 | |
| 
 | |
| #undef DECLARE_EVENT_CLASS
 | |
| #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
 | |
| 									\
 | |
| static notrace void							\
 | |
| ftrace_raw_event_##call(void *__data, proto)				\
 | |
| {									\
 | |
| 	struct ftrace_event_call *event_call = __data;			\
 | |
| 	struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 | |
| 	struct ring_buffer_event *event;				\
 | |
| 	struct ftrace_raw_##call *entry;				\
 | |
| 	struct ring_buffer *buffer;					\
 | |
| 	unsigned long irq_flags;					\
 | |
| 	int __data_size;						\
 | |
| 	int pc;								\
 | |
| 									\
 | |
| 	local_save_flags(irq_flags);					\
 | |
| 	pc = preempt_count();						\
 | |
| 									\
 | |
| 	__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 | |
| 									\
 | |
| 	event = trace_current_buffer_lock_reserve(&buffer,		\
 | |
| 				 event_call->event.type,		\
 | |
| 				 sizeof(*entry) + __data_size,		\
 | |
| 				 irq_flags, pc);			\
 | |
| 	if (!event)							\
 | |
| 		return;							\
 | |
| 	entry	= ring_buffer_event_data(event);			\
 | |
| 									\
 | |
| 	tstruct								\
 | |
| 									\
 | |
| 	{ assign; }							\
 | |
| 									\
 | |
| 	if (!filter_current_check_discard(buffer, event_call, entry, event)) \
 | |
| 		trace_nowake_buffer_unlock_commit(buffer,		\
 | |
| 						  event, irq_flags, pc); \
 | |
| }
 | |
| /*
 | |
|  * The ftrace_test_probe is compiled out, it is only here as a build time check
 | |
|  * to make sure that if the tracepoint handling changes, the ftrace probe will
 | |
|  * fail to compile unless it too is updated.
 | |
|  */
 | |
| 
 | |
| #undef DEFINE_EVENT
 | |
| #define DEFINE_EVENT(template, call, proto, args)			\
 | |
| static inline void ftrace_test_probe_##call(void)			\
 | |
| {									\
 | |
| 	check_trace_callback_type_##call(ftrace_raw_event_##template);	\
 | |
| }
 | |
| 
 | |
| #undef DEFINE_EVENT_PRINT
 | |
| #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 | |
| 
 | |
| #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 | |
| 
 | |
| #undef __entry
 | |
| #define __entry REC
 | |
| 
 | |
| #undef __print_flags
 | |
| #undef __print_symbolic
 | |
| #undef __get_dynamic_array
 | |
| #undef __get_str
 | |
| 
 | |
| #undef TP_printk
 | |
| #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 | |
| 
 | |
| #undef DECLARE_EVENT_CLASS
 | |
| #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
 | |
| _TRACE_PERF_PROTO(call, PARAMS(proto));					\
 | |
| static const char print_fmt_##call[] = print;				\
 | |
| static struct ftrace_event_class __used event_class_##call = {		\
 | |
| 	.system			= __stringify(TRACE_SYSTEM),		\
 | |
| 	.define_fields		= ftrace_define_fields_##call,		\
 | |
| 	.fields			= LIST_HEAD_INIT(event_class_##call.fields),\
 | |
| 	.raw_init		= trace_event_raw_init,			\
 | |
| 	.probe			= ftrace_raw_event_##call,		\
 | |
| 	.reg			= ftrace_event_reg,			\
 | |
| 	_TRACE_PERF_INIT(call)						\
 | |
| };
 | |
| 
 | |
| #undef DEFINE_EVENT
 | |
| #define DEFINE_EVENT(template, call, proto, args)			\
 | |
| 									\
 | |
| static struct ftrace_event_call __used event_##call = {			\
 | |
| 	.name			= #call,				\
 | |
| 	.class			= &event_class_##template,		\
 | |
| 	.event.funcs		= &ftrace_event_type_funcs_##template,	\
 | |
| 	.print_fmt		= print_fmt_##template,			\
 | |
| };									\
 | |
| static struct ftrace_event_call __used					\
 | |
| __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 | |
| 
 | |
| #undef DEFINE_EVENT_PRINT
 | |
| #define DEFINE_EVENT_PRINT(template, call, proto, args, print)		\
 | |
| 									\
 | |
| static const char print_fmt_##call[] = print;				\
 | |
| 									\
 | |
| static struct ftrace_event_call __used event_##call = {			\
 | |
| 	.name			= #call,				\
 | |
| 	.class			= &event_class_##template,		\
 | |
| 	.event.funcs		= &ftrace_event_type_funcs_##call,	\
 | |
| 	.print_fmt		= print_fmt_##call,			\
 | |
| };									\
 | |
| static struct ftrace_event_call __used					\
 | |
| __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 | |
| 
 | |
| #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 | |
| 
 | |
| /*
 | |
|  * Define the insertion callback to perf events
 | |
|  *
 | |
|  * The job is very similar to ftrace_raw_event_<call> except that we don't
 | |
|  * insert in the ring buffer but in a perf counter.
 | |
|  *
 | |
|  * static void ftrace_perf_<call>(proto)
 | |
|  * {
 | |
|  *	struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 | |
|  *	struct ftrace_event_call *event_call = &event_<call>;
 | |
|  *	extern void perf_tp_event(int, u64, u64, void *, int);
 | |
|  *	struct ftrace_raw_##call *entry;
 | |
|  *	struct perf_trace_buf *trace_buf;
 | |
|  *	u64 __addr = 0, __count = 1;
 | |
|  *	unsigned long irq_flags;
 | |
|  *	struct trace_entry *ent;
 | |
|  *	int __entry_size;
 | |
|  *	int __data_size;
 | |
|  *	int __cpu
 | |
|  *	int pc;
 | |
|  *
 | |
|  *	pc = preempt_count();
 | |
|  *
 | |
|  *	__data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 | |
|  *
 | |
|  *	// Below we want to get the aligned size by taking into account
 | |
|  *	// the u32 field that will later store the buffer size
 | |
|  *	__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
 | |
|  *			     sizeof(u64));
 | |
|  *	__entry_size -= sizeof(u32);
 | |
|  *
 | |
|  *	// Protect the non nmi buffer
 | |
|  *	// This also protects the rcu read side
 | |
|  *	local_irq_save(irq_flags);
 | |
|  *	__cpu = smp_processor_id();
 | |
|  *
 | |
|  *	if (in_nmi())
 | |
|  *		trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
 | |
|  *	else
 | |
|  *		trace_buf = rcu_dereference_sched(perf_trace_buf);
 | |
|  *
 | |
|  *	if (!trace_buf)
 | |
|  *		goto end;
 | |
|  *
 | |
|  *	trace_buf = per_cpu_ptr(trace_buf, __cpu);
 | |
|  *
 | |
|  * 	// Avoid recursion from perf that could mess up the buffer
 | |
|  * 	if (trace_buf->recursion++)
 | |
|  *		goto end_recursion;
 | |
|  *
 | |
|  * 	raw_data = trace_buf->buf;
 | |
|  *
 | |
|  *	// Make recursion update visible before entering perf_tp_event
 | |
|  *	// so that we protect from perf recursions.
 | |
|  *
 | |
|  *	barrier();
 | |
|  *
 | |
|  *	//zero dead bytes from alignment to avoid stack leak to userspace:
 | |
|  *	*(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
 | |
|  *	entry = (struct ftrace_raw_<call> *)raw_data;
 | |
|  *	ent = &entry->ent;
 | |
|  *	tracing_generic_entry_update(ent, irq_flags, pc);
 | |
|  *	ent->type = event_call->id;
 | |
|  *
 | |
|  *	<tstruct> <- do some jobs with dynamic arrays
 | |
|  *
 | |
|  *	<assign>  <- affect our values
 | |
|  *
 | |
|  *	perf_tp_event(event_call->id, __addr, __count, entry,
 | |
|  *		     __entry_size);  <- submit them to perf counter
 | |
|  *
 | |
|  * }
 | |
|  */
 | |
| 
 | |
| #ifdef CONFIG_PERF_EVENTS
 | |
| 
 | |
| #undef __entry
 | |
| #define __entry entry
 | |
| 
 | |
| #undef __get_dynamic_array
 | |
| #define __get_dynamic_array(field)	\
 | |
| 		((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 | |
| 
 | |
| #undef __get_str
 | |
| #define __get_str(field) (char *)__get_dynamic_array(field)
 | |
| 
 | |
| #undef __perf_addr
 | |
| #define __perf_addr(a) __addr = (a)
 | |
| 
 | |
| #undef __perf_count
 | |
| #define __perf_count(c) __count = (c)
 | |
| 
 | |
| #undef TP_perf_assign
 | |
| #define TP_perf_assign(args...) args
 | |
| 
 | |
| #undef DECLARE_EVENT_CLASS
 | |
| #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
 | |
| static notrace void							\
 | |
| perf_trace_##call(void *__data, proto)					\
 | |
| {									\
 | |
| 	struct ftrace_event_call *event_call = __data;			\
 | |
| 	struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 | |
| 	struct ftrace_raw_##call *entry;				\
 | |
| 	struct pt_regs __regs;						\
 | |
| 	u64 __addr = 0, __count = 1;					\
 | |
| 	struct hlist_head *head;					\
 | |
| 	int __entry_size;						\
 | |
| 	int __data_size;						\
 | |
| 	int rctx;							\
 | |
| 									\
 | |
| 	perf_fetch_caller_regs(&__regs);				\
 | |
| 									\
 | |
| 	__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 | |
| 	__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
 | |
| 			     sizeof(u64));				\
 | |
| 	__entry_size -= sizeof(u32);					\
 | |
| 									\
 | |
| 	if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE,		\
 | |
| 		      "profile buffer not large enough"))		\
 | |
| 		return;							\
 | |
| 									\
 | |
| 	entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare(	\
 | |
| 		__entry_size, event_call->event.type, &__regs, &rctx);	\
 | |
| 	if (!entry)							\
 | |
| 		return;							\
 | |
| 									\
 | |
| 	tstruct								\
 | |
| 									\
 | |
| 	{ assign; }							\
 | |
| 									\
 | |
| 	head = this_cpu_ptr(event_call->perf_events);			\
 | |
| 	perf_trace_buf_submit(entry, __entry_size, rctx, __addr,	\
 | |
| 		__count, &__regs, head);				\
 | |
| }
 | |
| 
 | |
| /*
 | |
|  * This part is compiled out, it is only here as a build time check
 | |
|  * to make sure that if the tracepoint handling changes, the
 | |
|  * perf probe will fail to compile unless it too is updated.
 | |
|  */
 | |
| #undef DEFINE_EVENT
 | |
| #define DEFINE_EVENT(template, call, proto, args)			\
 | |
| static inline void perf_test_probe_##call(void)				\
 | |
| {									\
 | |
| 	check_trace_callback_type_##call(perf_trace_##template);	\
 | |
| }
 | |
| 
 | |
| 
 | |
| #undef DEFINE_EVENT_PRINT
 | |
| #define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
 | |
| 	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 | |
| 
 | |
| #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 | |
| #endif /* CONFIG_PERF_EVENTS */
 | |
| 
 | |
| #undef _TRACE_PROFILE_INIT
 | |
| 
 |