linux-kernel - Re: [PATCH] tracing: Simplify conditional compilation code in tracing_set

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Message-ID: <20220602082559.795189e1@rorschach.local.home>
Date:   Thu, 2 Jun 2022 08:25:59 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     sunliming <sunliming@...inos.cn>
Cc:     mingo@...nel.org, linux-kernel@...r.kernel.org,
        kelulanainsley@...il.com
Subject: Re: [PATCH] tracing: Simplify conditional compilation code in
 tracing_set_tracer()

On Thu,  2 Jun 2022 10:24:04 +0800
sunliming <sunliming@...inos.cn> wrote:

> Two conditional compilation directives "#ifdef CONFIG_TRACER_SNAPSHOT"
> are used consecutively, and no other code in between. Simplify conditional
> the compilation code and only use one "#ifdef CONFIG_TRACER_SNAPSHOT".

I think you mean CONFIG_TRACER_MAX_TRACE here.

-- Steve

> 
> Signed-off-by: sunliming <sunliming@...inos.cn>
> ---
>  kernel/trace/trace.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index f400800bc910..dc959e339512 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -6430,9 +6430,7 @@ int tracing_set_tracer(struct trace_array *tr, const char *buf)
>  		synchronize_rcu();
>  		free_snapshot(tr);
>  	}
> -#endif
>  
> -#ifdef CONFIG_TRACER_MAX_TRACE
>  	if (t->use_max_tr && !had_max_tr) {
>  		ret = tracing_alloc_snapshot_instance(tr);
>  		if (ret < 0)