linux-kernel - Re: [PATCH V7 8/9] trace/osnoise: Remove STACKTRACE ifdefs from inside functions

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Date:   Fri, 29 Oct 2021 14:31:27 +0200
From:   Daniel Bristot de Oliveira <bristot@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Ingo Molnar <mingo@...hat.com>, Tom Zanussi <zanussi@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Clark Williams <williams@...hat.com>,
        John Kacur <jkacur@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        linux-rt-users@...r.kernel.org, linux-trace-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V7 8/9] trace/osnoise: Remove STACKTRACE ifdefs from
 inside functions

On 10/28/21 23:29, Daniel Bristot de Oliveira wrote:
> Remove CONFIG_STACKTRACE from inside functions, avoiding
> compilation problems in the future.
> 
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Tom Zanussi <zanussi@...nel.org>
> Cc: Masami Hiramatsu <mhiramat@...nel.org>
> Cc: Juri Lelli <juri.lelli@...hat.com>
> Cc: Clark Williams <williams@...hat.com>
> Cc: John Kacur <jkacur@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Cc: Daniel Bristot de Oliveira <bristot@...nel.org>
> Cc: linux-rt-users@...r.kernel.org
> Cc: linux-trace-devel@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Suggested-by: Steven Rostedt <rostedt@...dmis.org>
> Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
> ---
>  kernel/trace/trace_osnoise.c | 44 ++++++++++++++++++++++++------------
>  1 file changed, 29 insertions(+), 15 deletions(-)
> 
> diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
> index 0c3a93f51b08..eaa6396e3262 100644
> --- a/kernel/trace/trace_osnoise.c
> +++ b/kernel/trace/trace_osnoise.c
> @@ -635,13 +635,19 @@ __timerlat_dump_stack(struct trace_buffer *buffer, struct trace_stack *fstack, u
>  /*
>   * timerlat_dump_stack - dump a stack trace previously saved
>   */
> -static void timerlat_dump_stack(void)
> +static void timerlat_dump_stack(u64 latency)
>  {
>  	struct osnoise_instance *inst;
>  	struct trace_buffer *buffer;
>  	struct trace_stack *fstack;
>  	unsigned int size;
>  
> +	/*
> +	 * 0 is disabled, so it will never be > than latency.
> +	 */
> +	if (osnoise_data.print_stack > latency)
> +		return;

Oops, I placed the comment, but forgot to place the check. This if should be:

if (!osnoise_data.print_stack || osnoise_data.print_stack > latency)
	return;

-- Daniel