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tracing: Report wrong dynamic event command

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Report wrong dynamic event type in the command via error_log.
-----
 # echo "z hoge" > /sys/kernel/tracing/dynamic_events
 sh: write error: Invalid argument
 # cat /sys/kernel/tracing/error_log
 [   22.977022] dynevent: error: No matching dynamic event type
   Command: z hoge
            ^
-----

Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://patch.msgid.link/176278970056.343441.10528135217342926645.stgit@devnote2
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu (Google) 2025-11-11 00:48:20 +09:00 committed by Steven Rostedt (Google)
parent 3a0d5bc76f
commit 7157062bb4
1 changed files with 9 additions and 2 deletions
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11
kernel/trace/trace_dynevent.c
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@ -144,9 +144,16 @@ static int create_dyn_event(const char *raw_command)
if (!ret || ret != -ECANCELED)
break;
}
mutex_unlock(&dyn_event_ops_mutex);
if (ret == -ECANCELED)
if (ret == -ECANCELED) {
static const char *err_msg[] = {"No matching dynamic event type"};
/* Wrong dynamic event. Leave an error message. */
tracing_log_err(NULL, "dynevent", raw_command, err_msg,
0, 0);
ret = -EINVAL;
}
mutex_unlock(&dyn_event_ops_mutex);
return ret;
}