linux-kernel - Re: [PATCH 10/10] trace: Replace printk and WARN

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Date:   Fri, 27 Mar 2020 18:51:38 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Jules Irenge <jbi.octave@...il.com>
Cc:     julia.lawall@...6.fr, boqun.feng@...il.com,
        Ingo Molnar <mingo@...hat.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: Re: [PATCH 10/10] trace: Replace printk and WARN_ON with WARN

On Fri, 27 Mar 2020 21:23:57 +0000
Jules Irenge <jbi.octave@...il.com> wrote:

> Coccinelle suggests replacing printk and WARN_ON with WARN
> 
> SUGGESTION: printk + WARN_ON can be just WARN.
> Signed-off-by: Jules Irenge <jbi.octave@...il.com>
> ---
>  kernel/trace/trace.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index 6b11e4e2150c..1fe31272ea73 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -1799,9 +1799,7 @@ static int run_tracer_selftest(struct tracer *type)
>  	/* the test is responsible for resetting too */
>  	tr->current_trace = saved_tracer;
>  	if (ret) {
> -		printk(KERN_CONT "FAILED!\n");
> -		/* Add the warning after printing 'FAILED' */

NACK! Did you not read the above comment. The FAILED goes with another
print and should NOT be part of the WARN_ON.

-- Steve

> -		WARN_ON(1);
> +		WARN(1, "FAILED!\n");
>  		return -1;
>  	}
>  	/* Only reset on passing, to avoid touching corrupted buffers */