From: Masami Hiramatsu mhiramat@kernel.org

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.

Link: http://lkml.kernel.org/r/153986835420.18251.2191216690677025744.stgit@devbox

Cc: Shuah Khan shuah@kernel.org Cc: Tom Zanussi tom.zanussi@linux.intel.com Cc: stable@vger.kernel.org Fixes: commit 4b147936fa50 ("tracing: Add support for 'synthetic' events") Signed-off-by: Masami Hiramatsu mhiramat@kernel.org Signed-off-by: Steven Rostedt (VMware) 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; }