linux-kernel - [PATCH] tracing: use ring_buffer_record_is_set_on() in tracer_tracing_is

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Message-Id: <20240205065340.2848065-1-svens@linux.ibm.com>
Date: Mon,  5 Feb 2024 07:53:40 +0100
From: Sven Schnelle <svens@...ux.ibm.com>
To: Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        Mete Durlu <meted@...ux.ibm.com>
Subject: [PATCH] tracing: use ring_buffer_record_is_set_on() in tracer_tracing_is_on()

tracer_tracing_is_on() checks whether record_disabled is not zero. This
checks both the record_disabled counter and the RB_BUFFER_OFF flag.
Reading the source it looks like this function should only check for
the RB_BUFFER_OFF flag. Therefore use ring_buffer_record_is_set_on().
This fixes spurious fails in the 'test for function traceon/off triggers'
test from the ftrace testsuite when the system is under load.

Signed-off-by: Sven Schnelle <svens@...ux.ibm.com>
---
 kernel/trace/trace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 2a7c6fd934e9..47e221e1e720 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1532,7 +1532,7 @@ void disable_trace_on_warning(void)
 bool tracer_tracing_is_on(struct trace_array *tr)
 {
 	if (tr->array_buffer.buffer)
-		return ring_buffer_record_is_on(tr->array_buffer.buffer);
+		return ring_buffer_record_is_set_on(tr->array_buffer.buffer);
 	return !tr->buffer_disabled;
 }
 
-- 
2.40.1