linux-kernel - [PATCH 2/3] tracing: Fix synthetic event to allow semicolon at end

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Message-Id: <153986472359.1671.14765934058821057199.stgit@devbox>
Date:   Thu, 18 Oct 2018 21:12:03 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>, Shuah Khan <shuah@...nel.org>
Cc:     Tom Zanussi <zanussi@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Tom Zanussi <tom.zanussi@...ux.intel.com>
Subject: [PATCH 2/3] tracing: Fix synthetic event to allow semicolon at end

Fix synthetic event to allow independent semicolon at end.

The synthetic_events interface accepts a semicolon after the
last word if there is no space.

 # echo "myevent u64 var;" >> synthetic_events

But if there is a space, it returns an error.

 # echo "myevent u64 var ;" > synthetic_events
 sh: write error: Invalid argument

This behavior is difficult for users to understand. Let's
allow the last independent semicolon too.

Fixes: commit 4b147936fa50 ("tracing: Add support for 'synthetic' events")
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Cc: <stable@...r.kernel.org>
Cc: Tom Zanussi <tom.zanussi@...ux.intel.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
---
 kernel/trace/trace_events_hist.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 6ff83941065a..d239004aaf29 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1088,7 +1088,7 @@ static int create_synth_event(int argc, char **argv)
 		i += consumed - 1;
 	}
 
-	if (i < argc) {
+	if (i < argc && strcmp(argv[i], ";") != 0) {
 		ret = -EINVAL;
 		goto err;
 	}