root/include/trace/events/netlink.h
#undef TRACE_SYSTEM
#define TRACE_SYSTEM netlink

#if !defined(_TRACE_NETLINK_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_NETLINK_H

#include <linux/tracepoint.h>

TRACE_EVENT(netlink_extack,

        TP_PROTO(const char *msg),

        TP_ARGS(msg),

        TP_STRUCT__entry(
                __string(       msg,    msg     )
        ),

        TP_fast_assign(
                __assign_str(msg);
        ),

        TP_printk("msg=%s", __get_str(msg))
);

#endif /* _TRACE_NETLINK_H */

/* This part must be outside protection */
#include <trace/define_trace.h>