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| author |   Masami Hiramatsu <mhiramat@kernel.org> | 2018-10-22 00:08:20 +0900 |
|---|---|---|
| committer |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2018-10-28 04:58:15 -0400 |
| commit | 18858511fd8a877303cc34c06efa461b26a0e070 (patch) | |
| tree | 12f44dd2fc90a9bbdf54c6927245bdf8eb65414a /kernel | |
| parent | selftests: ftrace: Add synthetic event syntax testcase (diff) | |
| download | linux-dev-18858511fd8a877303cc34c06efa461b26a0e070.tar.xz linux-dev-18858511fd8a877303cc34c06efa461b26a0e070.zip | |
tracing: Return -ENOENT if there is no target synthetic event
Return -ENOENT error if there is no target synthetic event.
This notices an operation failure to user as below;
# echo 'wakeup_latency u64 lat; pid_t pid;' > synthetic_events
# echo '!wakeup' >> synthetic_events
sh: write error: No such file or directory
Link: http://lkml.kernel.org/r/154013449986.25576.9487131386597290172.stgit@devbox
Acked-by: Tom Zanussi <zanussi@linux.intel.com>
Tested-by: Tom Zanussi <zanussi@linux.intel.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Rajvi Jingar <rajvi.jingar@intel.com>
Cc: stable@vger.kernel.org
Fixes: 4b147936fa50 ('tracing: Add support for 'synthetic' events')
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace_events_hist.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index d239004aaf29..eb908ef2ecec 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -1063,8 +1063,10 @@ static int create_synth_event(int argc, char **argv) event = NULL; ret = -EEXIST; goto out; - } else if (delete_event) + } else if (delete_event) { + ret = -ENOENT; goto out; + } if (argc < 2) { ret = -EINVAL; |