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

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Message-ID: <35d17995-8707-4ddc-879b-9ed89d292c91@linux.ibm.com>
Date: Tue, 6 Feb 2024 08:05:02 +0100
From: Mete Durlu <meted@...ux.ibm.com>
To: Sven Schnelle <svens@...ux.ibm.com>, 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
Subject: Re: [PATCH] tracing: use ring_buffer_record_is_set_on() in
 tracer_tracing_is_on()

On 2/5/24 07:53, Sven Schnelle wrote:
> 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

Tested-By: Mete Durlu <meted@...ux.ibm.com>