linux-kernel - Re: [PATCH] tracing: use WARN

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Date:   Mon, 26 Jul 2021 11:02:37 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Jason Wang <wangborong@...rlc.com>
Cc:     mingo@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tracing: use WARN_ONCE

On Mon, 26 Jul 2021 21:56:35 +0800
Jason Wang <wangborong@...rlc.com> wrote:

> printk + WARN_ON_ONCE can be just WARN_ONCE.
> 
> Signed-off-by: Jason Wang <wangborong@...rlc.com>
> ---
>  kernel/trace/trace_output.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
> index a0bf446bb034..c06726b6d8b4 100644
> --- a/kernel/trace/trace_output.c
> +++ b/kernel/trace/trace_output.c
> @@ -1574,9 +1574,8 @@ __init static int init_events(void)
>  
>  		ret = register_trace_event(event);
>  		if (!ret) {
> -			printk(KERN_WARNING "event %d failed to register\n",
> -			       event->type);
> -			WARN_ON_ONCE(1);
> +			WARN_ONCE(1, "event %d failed to register\n",
> +				  event->type);
>  		}
>  	}
>  

If you're going to change this, then nuke the conditional!

	WARN_ONCE(!ret, "event %d failed to register\n", event->type);

-- Steve