From 7157062bb46c8bcfba3a7d77f91fc4795bff1316 Mon Sep 17 00:00:00 2001 From: "Masami Hiramatsu (Google)" Date: Tue, 11 Nov 2025 00:48:20 +0900 Subject: [PATCH] tracing: Report wrong dynamic event command 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 Link: https://patch.msgid.link/176278970056.343441.10528135217342926645.stgit@devnote2 Signed-off-by: Masami Hiramatsu (Google) Signed-off-by: Steven Rostedt (Google) --- kernel/trace/trace_dynevent.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c index d06854bd32b35..c4dfbc293baee 100644 --- a/kernel/trace/trace_dynevent.c +++ b/kernel/trace/trace_dynevent.c @@ -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; } -- 2.47.3