[PATCH v2 2/3] tracing: Fix synthetic event to allow semicolon at end

[Masami Hiramatsu]

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 <mhira...@kernel.org>
Cc: sta...@vger.kernel.org
Cc: Tom Zanussi <tom.zanu...@linux.intel.com>
Cc: Steven Rostedt <rost...@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;
        }