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From: Masami Hiramatsu <mhiramat@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>, Shuah Khan <shuah@kernel.org>
Cc: Tom Zanussi <zanussi@kernel.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	linux-kernel@vger.kernel.org, stable@vger.kernel.org,
	Tom Zanussi <tom.zanussi@linux.intel.com>
Subject: [PATCH v2 2/3] tracing: Fix synthetic event to allow semicolon at end
Date: Thu, 18 Oct 2018 22:12:34 +0900
Message-ID: <153986835420.18251.2191216690677025744.stgit@devbox> (raw)
In-Reply-To: <153986829702.18251.1286066460999338772.stgit@devbox>

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@kernel.org>
Cc: stable@vger.kernel.org
Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
Cc: Steven Rostedt <rostedt@goodmis.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;
 	}


  parent reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-18 13:11 [PATCH v2 0/3] tracing: Fix synthetic event parser Masami Hiramatsu
2018-10-18 13:12 ` [PATCH v2 1/3] tracing: Fix synthetic event to accept unsigned modifier Masami Hiramatsu
2018-10-18 13:12 ` Masami Hiramatsu [this message]
2018-10-18 13:13 ` [PATCH v2 3/3] selftests: ftrace: Add synthetic event syntax testcase Masami Hiramatsu
2018-10-18 20:34   ` Steven Rostedt
2018-10-18 20:38     ` Shuah Khan
2018-10-18 20:45       ` Steven Rostedt
2018-10-19  0:38     ` Masami Hiramatsu
2018-10-19  0:46       ` Steven Rostedt
2018-10-22 20:10 ` [PATCH v2 0/3] tracing: Fix synthetic event parser Tom Zanussi

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