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authorTom Zanussi <zanussi@kernel.org>2020-04-03 22:31:19 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2020-06-01 15:21:08 +0300
commit1b94b3aed367ff2cdc84d325e0aa9d7cc9e3cf2a (patch)
tree3603eadfe1e1bcde0e38ec7adffd7ee3e90c0e64 /kernel/trace/trace_events_hist.c
parentfc9d276f22330e9322a9c592c71e0571810205f7 (diff)
downloadlinux-1b94b3aed367ff2cdc84d325e0aa9d7cc9e3cf2a.tar.xz
tracing: Check state.disabled in synth event trace functions
Since trace_state.disabled is set in __synth_event_trace_start() at the same time -ENOENT is returned, don't bother returning -ENOENT - just have callers check trace_state.disabled instead, and avoid the extra return val munging. Link: http://lkml.kernel.org/r/87315c3889af870e8370e82b76cf48b426d70130.1585941485.git.zanussi@kernel.org Suggested-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Tom Zanussi <zanussi@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@godmis.org>
Diffstat (limited to 'kernel/trace/trace_events_hist.c')
-rw-r--r--kernel/trace/trace_events_hist.c19
1 files changed, 3 insertions, 16 deletions
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index fcab11cc6833..5cfe8f998b3e 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1845,7 +1845,6 @@ __synth_event_trace_start(struct trace_event_file *file,
if (!(file->flags & EVENT_FILE_FL_ENABLED) ||
trace_trigger_soft_disabled(file)) {
trace_state->disabled = true;
- ret = -ENOENT;
goto out;
}
@@ -1907,11 +1906,8 @@ int synth_event_trace(struct trace_event_file *file, unsigned int n_vals, ...)
int ret;
ret = __synth_event_trace_start(file, &state);
- if (ret) {
- if (ret == -ENOENT)
- ret = 0; /* just disabled, not really an error */
+ if (ret || state.disabled)
return ret;
- }
if (n_vals != state.event->n_fields) {
ret = -EINVAL;
@@ -1987,11 +1983,8 @@ int synth_event_trace_array(struct trace_event_file *file, u64 *vals,
int ret;
ret = __synth_event_trace_start(file, &state);
- if (ret) {
- if (ret == -ENOENT)
- ret = 0; /* just disabled, not really an error */
+ if (ret || state.disabled)
return ret;
- }
if (n_vals != state.event->n_fields) {
ret = -EINVAL;
@@ -2067,16 +2060,10 @@ EXPORT_SYMBOL_GPL(synth_event_trace_array);
int synth_event_trace_start(struct trace_event_file *file,
struct synth_event_trace_state *trace_state)
{
- int ret;
-
if (!trace_state)
return -EINVAL;
- ret = __synth_event_trace_start(file, trace_state);
- if (ret == -ENOENT)
- ret = 0; /* just disabled, not really an error */
-
- return ret;
+ return __synth_event_trace_start(file, trace_state);
}
EXPORT_SYMBOL_GPL(synth_event_trace_start);