/* SPDX-License-Identifier: GPL-2.0 */ /* * If TRACE_SYSTEM is defined, that will be the directory created * in the ftrace directory under /sys/kernel/tracing/events/<system> * * The define_trace.h below will also look for a file name of * TRACE_SYSTEM.h where TRACE_SYSTEM is what is defined here. * In this case, it would look for sample-trace.h * * If the header name will be different than the system name * (as in this case), then you can override the header name that * define_trace.h will look up by defining TRACE_INCLUDE_FILE * * This file is called sample-trace-array.h but we want the system * to be called "sample-subsystem". Therefore we must define the name of this * file: * * #define TRACE_INCLUDE_FILE sample-trace-array * * As we do in the bottom of this file. * * Notice that TRACE_SYSTEM should be defined outside of #if * protection, just like TRACE_INCLUDE_FILE. */#undef TRACE_SYSTEM#define TRACE_SYSTEM sample-subsystem /* * TRACE_SYSTEM is expected to be a C valid variable (alpha-numeric * and underscore), although it may start with numbers. If for some * reason it is not, you need to add the following lines: */#undef TRACE_SYSTEM_VAR#define TRACE_SYSTEM_VAR sample_subsystem /* * But the above is only needed if TRACE_SYSTEM is not alpha-numeric * and underscored. By default, TRACE_SYSTEM_VAR will be equal to * TRACE_SYSTEM. As TRACE_SYSTEM_VAR must be alpha-numeric, if * TRACE_SYSTEM is not, then TRACE_SYSTEM_VAR must be defined with * only alpha-numeric and underscores. * * The TRACE_SYSTEM_VAR is only used internally and not visible to * user space. */ /* * Notice that this file is not protected like a normal header. * We also must allow for rereading of this file. The * *  || defined(TRACE_HEADER_MULTI_READ) * * serves this purpose. */#if !defined(_SAMPLE_TRACE_ARRAY_H) || defined(TRACE_HEADER_MULTI_READ)#define _SAMPLE_TRACE_ARRAY_H #include <linux/tracepoint.h>TRACE_EVENT(sample_event, 	TP_PROTO(int count, unsigned long time), 	TP_ARGS(count, time), 	TP_STRUCT__entry(		__field(int, count)		__field(unsigned long, time)	), 	TP_fast_assign(		__entry->count = count;		__entry->time = time;	), 	TP_printk("count value=%d at jiffies=%lu", __entry->count,		__entry->time)	);#endif #undef TRACE_INCLUDE_PATH#define TRACE_INCLUDE_PATH .#define TRACE_INCLUDE_FILE sample-trace-array#include <trace/define_trace.h>