printk.h

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#undef TRACE_SYSTEM
#define TRACE_SYSTEM printk

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

#include <linux/tracepoint.h>

TRACE_EVENT_CONDITION(console,
    TP_PROTO(const char *log_buf, unsigned start, unsigned end,
         unsigned log_buf_len),

    TP_ARGS(log_buf, start, end, log_buf_len),

    TP_CONDITION(start != end),

    TP_STRUCT__entry(
        __dynamic_array(char, msg, end - start + 1)
    ),

    TP_fast_assign(
        if ((start & (log_buf_len - 1)) > (end & (log_buf_len - 1))) {
            memcpy(__get_dynamic_array(msg),
                   log_buf + (start & (log_buf_len - 1)),
                   log_buf_len - (start & (log_buf_len - 1)));
            memcpy((char *)__get_dynamic_array(msg) +
                   log_buf_len - (start & (log_buf_len - 1)),
                   log_buf, end & (log_buf_len - 1));
        } else
            memcpy(__get_dynamic_array(msg),
                   log_buf + (start & (log_buf_len - 1)),
                   end - start);
        ((char *)__get_dynamic_array(msg))[end - start] = 0;
    ),

    TP_printk("%s", __get_str(msg))
);
#endif /* _TRACE_PRINTK_H */

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