linux-kernel - [for-linus][PATCH 4/5] tracing: Dont return -EINVAL when tracing soft disabled synth events

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Date:   Tue, 11 Feb 2020 08:49:45 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tom Zanussi <zanussi@...nel.org>
Subject: [for-linus][PATCH 4/5] tracing: Dont return -EINVAL when tracing soft disabled synth events

From: Tom Zanussi <zanussi@...nel.org>

There's no reason to return -EINVAL when tracing a synthetic event if
it's soft disabled - treat it the same as if it were hard disabled and
return normally.

Have synth_event_trace() and synth_event_trace_array() just return
normally, and have synth_event_trace_start set the trace state to
disabled and return.

Link: http://lkml.kernel.org/r/df5d02a1625aff97c9866506c5bada6a069982ba.1581374549.git.zanussi@kernel.org

Fixes: 8dcc53ad956d2 ("tracing: Add synth_event_trace() and related functions")
Signed-off-by: Tom Zanussi <zanussi@...nel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 kernel/trace/trace_events_hist.c | 20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index a546ffa14785..99a02168599b 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1828,7 +1828,8 @@ int synth_event_trace(struct trace_event_file *file, unsigned int n_vals, ...)
 	 * called directly by the user, we don't have that but we
 	 * still need to honor not logging when disabled.
 	 */
-	if (!(file->flags & EVENT_FILE_FL_ENABLED))
+	if (!(file->flags & EVENT_FILE_FL_ENABLED) ||
+	    trace_trigger_soft_disabled(file))
 		return 0;
 
 	event = file->event_call->data;
@@ -1836,9 +1837,6 @@ int synth_event_trace(struct trace_event_file *file, unsigned int n_vals, ...)
 	if (n_vals != event->n_fields)
 		return -EINVAL;
 
-	if (trace_trigger_soft_disabled(file))
-		return -EINVAL;
-
 	fields_size = event->n_u64 * sizeof(u64);
 
 	/*
@@ -1918,7 +1916,8 @@ int synth_event_trace_array(struct trace_event_file *file, u64 *vals,
 	 * called directly by the user, we don't have that but we
 	 * still need to honor not logging when disabled.
 	 */
-	if (!(file->flags & EVENT_FILE_FL_ENABLED))
+	if (!(file->flags & EVENT_FILE_FL_ENABLED) ||
+	    trace_trigger_soft_disabled(file))
 		return 0;
 
 	event = file->event_call->data;
@@ -1926,9 +1925,6 @@ int synth_event_trace_array(struct trace_event_file *file, u64 *vals,
 	if (n_vals != event->n_fields)
 		return -EINVAL;
 
-	if (trace_trigger_soft_disabled(file))
-		return -EINVAL;
-
 	fields_size = event->n_u64 * sizeof(u64);
 
 	/*
@@ -2017,7 +2013,8 @@ int synth_event_trace_start(struct trace_event_file *file,
 	 * trace case, we save the enabed state upon start and just
 	 * ignore the following data calls.
 	 */
-	if (!(file->flags & EVENT_FILE_FL_ENABLED)) {
+	if (!(file->flags & EVENT_FILE_FL_ENABLED) ||
+	    trace_trigger_soft_disabled(file)) {
 		trace_state->enabled = false;
 		goto out;
 	}
@@ -2026,11 +2023,6 @@ int synth_event_trace_start(struct trace_event_file *file,
 
 	trace_state->event = file->event_call->data;
 
-	if (trace_trigger_soft_disabled(file)) {
-		ret = -EINVAL;
-		goto out;
-	}
-
 	fields_size = trace_state->event->n_u64 * sizeof(u64);
 
 	/*
-- 
2.24.1