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| 2 |
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| 3 | |
| 4 | * If TRACE_SYSTEM is defined, that will be the directory created
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| 5 | * in the ftrace directory under /sys/kernel/tracing/events/<system>
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| 6 | *
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| 7 | * The define_trace.h below will also look for a file name of
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| 8 | * TRACE_SYSTEM.h where TRACE_SYSTEM is what is defined here.
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| 9 | * In this case, it would look for sample-trace.h
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| 10 | *
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| 11 | * If the header name will be different than the system name
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| 12 | * (as in this case), then you can override the header name that
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| 13 | * define_trace.h will look up by defining TRACE_INCLUDE_FILE
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| 14 | *
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| 15 | * This file is called sample-trace-array.h but we want the system
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| 16 | * to be called "sample-subsystem". Therefore we must define the name of this
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| 17 | * file:
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| 18 | *
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| 19 | * #define TRACE_INCLUDE_FILE sample-trace-array
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| 20 | *
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| 21 | * As we do in the bottom of this file.
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| 22 | *
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| 23 | * Notice that TRACE_SYSTEM should be defined outside of #if
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| 24 | * protection, just like TRACE_INCLUDE_FILE.
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| 25 |
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| 26 | #undef TRACE_SYSTEM
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| 27 | #define TRACE_SYSTEM sample-subsystem
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| 28 |
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| 29 | |
| 30 | * TRACE_SYSTEM is expected to be a C valid variable (alpha-numeric
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| 31 | * and underscore), although it may start with numbers. If for some
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| 32 | * reason it is not, you need to add the following lines:
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| 33 |
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| 34 | #undef TRACE_SYSTEM_VAR
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| 35 | #define TRACE_SYSTEM_VAR sample_subsystem
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| 36 |
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| 37 | |
| 38 | * But the above is only needed if TRACE_SYSTEM is not alpha-numeric
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| 39 | * and underscored. By default, TRACE_SYSTEM_VAR will be equal to
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| 40 | * TRACE_SYSTEM. As TRACE_SYSTEM_VAR must be alpha-numeric, if
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| 41 | * TRACE_SYSTEM is not, then TRACE_SYSTEM_VAR must be defined with
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| 42 | * only alpha-numeric and underscores.
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| 43 | *
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| 44 | * The TRACE_SYSTEM_VAR is only used internally and not visible to
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| 45 | * user space.
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| 46 |
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| 47 |
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| 48 | |
| 49 | * Notice that this file is not protected like a normal header.
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| 50 | * We also must allow for rereading of this file. The
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| 51 | *
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| 52 | * || defined(TRACE_HEADER_MULTI_READ)
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| 53 | *
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| 54 | * serves this purpose.
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| 55 |
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| 56 | #if !defined(_SAMPLE_TRACE_ARRAY_H) || defined(TRACE_HEADER_MULTI_READ)
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| 57 | #define _SAMPLE_TRACE_ARRAY_H
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| 58 |
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| 59 | #include <linux/tracepoint.h>
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| 60 | TRACE_EVENT(sample_event,
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| 61 |
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| 62 | TP_PROTO(int count, unsigned long time),
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| 63 |
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| 64 | TP_ARGS(count, time),
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| 65 |
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| 66 | TP_STRUCT__entry(
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| 67 | __field(int, count)
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| 68 | __field(unsigned long, time)
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| 69 | ),
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| 70 |
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| 71 | TP_fast_assign(
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| 72 | __entry->count = count;
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| 73 | __entry->time = time;
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| 74 | ),
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| 75 |
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| 76 | TP_printk("count value=%d at jiffies=%lu", __entry->count,
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| 77 | __entry->time)
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| 78 | );
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| 79 | #endif
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| 80 |
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| 81 | #undef TRACE_INCLUDE_PATH
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| 82 | #define TRACE_INCLUDE_PATH .
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| 83 | #define TRACE_INCLUDE_FILE sample-trace-array
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| 84 | #include <trace/define_trace.h>
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