linux/include/trace/define_custom_trace.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Trace files that want to automate creation of all tracepoints defined
 * in their file should include this file. The following are macros that the
 * trace file may define:
 *
 * TRACE_SYSTEM defines the system the tracepoint is for
 *
 * TRACE_INCLUDE_FILE if the file name is something other than TRACE_SYSTEM.h
 *     This macro may be defined to tell define_trace.h what file to include.
 *     Note, leave off the ".h".
 *
 * TRACE_INCLUDE_PATH if the path is something other than core kernel include/trace
 *     then this macro can define the path to use. Note, the path is relative to
 *     define_trace.h, not the file including it. Full path names for out of tree
 *     modules must be used.
 */

#ifdef CREATE_CUSTOM_TRACE_EVENTS

/* Prevent recursion */
#undef CREATE_CUSTOM_TRACE_EVENTS

#include <linux/stringify.h>

#undef TRACE_CUSTOM_EVENT
#define TRACE_CUSTOM_EVENT …

#undef DEFINE_CUSTOM_EVENT
#define DEFINE_CUSTOM_EVENT …

#undef TRACE_INCLUDE
#undef __TRACE_INCLUDE

#ifndef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_FILE …
#define UNDEF_TRACE_INCLUDE_FILE
#endif

#ifndef TRACE_INCLUDE_PATH
#define __TRACE_INCLUDE …
#define UNDEF_TRACE_INCLUDE_PATH
#else
#define __TRACE_INCLUDE(system) …
#endif

#define TRACE_INCLUDE(system) …

/* Let the trace headers be reread */
#define TRACE_CUSTOM_MULTI_READ

#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

#ifdef TRACEPOINTS_ENABLED
#include <trace/trace_custom_events.h>
#endif

#undef TRACE_CUSTOM_EVENT
#undef DECLARE_CUSTOM_EVENT_CLASS
#undef DEFINE_CUSTOM_EVENT
#undef TRACE_CUSTOM_MULTI_READ

/* Only undef what we defined in this file */
#ifdef UNDEF_TRACE_INCLUDE_FILE
# undef TRACE_INCLUDE_FILE
# undef UNDEF_TRACE_INCLUDE_FILE
#endif

#ifdef UNDEF_TRACE_INCLUDE_PATH
# undef TRACE_INCLUDE_PATH
# undef UNDEF_TRACE_INCLUDE_PATH
#endif

/* We may be processing more files */
#define CREATE_CUSTOM_TRACE_POINTS

#endif /* CREATE_CUSTOM_TRACE_POINTS */