Commit 71e1c8ac authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt

tracing: update sample with TRACE_INCLUDE_FILE

When creating trace events for ftrace, the header file with the TRACE_EVENT
macros must also have a macro called TRACE_SYSTEM. This macro describes
the name of the system the TRACE_EVENTS are defined for. It also doubles
as a way for the define_trace.h file to include the file that included

For example:

in irq.h

 #define TRACE_SYSTEM irq


 #include <trace/define_trace.h>

The define_trace will use TRACE_SYSTEM to include irq.h. But if the name
of the trace system does not match the name of the trace header file,
one can override it with:

Which will change define_trace.h to inclued foo_trace.h instead of foo.h

The sample comments this, but people that use the sample code will more
likely use the code and not read the comments. This patch changes the
sample code to use the TRACE_INCLUDE_FILE to better show developers how to
use it.

[ Impact: make sample less confusing to developers ]
Reported-by: default avatarChristoph Hellwig <>
Signed-off-by: default avatarSteven Rostedt <>
parent 3e07a4f6
......@@ -31,7 +31,7 @@
#define TRACE_SYSTEM trace-events-sample
#define TRACE_SYSTEM sample
* The TRACE_EVENT macro is broken up into 5 parts.
......@@ -120,5 +120,10 @@ TRACE_EVENT(foo_bar,
* result.
* TRACE_INCLUDE_FILE is not needed if the filename and TRACE_SYSTEM are equal
#define TRACE_INCLUDE_FILE trace-events-sample
#include <trace/define_trace.h>
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