linux-kernel - Re: [PATCH] tracing/synthetic: Print out u64 values properly

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Message-Id: <20230915150101.ef50c4774ab85aa2ff7431ec@kernel.org>
Date:   Fri, 15 Sep 2023 15:01:01 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Tero Kristo <tero.kristo@...ux.intel.com>
Cc:     rostedt@...dmis.org, artem.bityutskiy@...ux.intel.com,
        linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] tracing/synthetic: Print out u64 values properly

Hi Tero,

On Mon, 11 Sep 2023 17:17:04 +0300
Tero Kristo <tero.kristo@...ux.intel.com> wrote:

> The synth traces incorrectly print pointer to the synthetic event values
> instead of the actual value when using u64 type. Fix by addressing the
> contents of the union properly.

Thanks for pointing it out.
But I would like to see a new "case 8:" print code instead of changing
"default". Can you keep the default as it is and add "case 8:" case there?

Thanks,

> 
> Fixes: ddeea494a16f ("tracing/synthetic: Use union instead of casts")
> Cc: stable@...r.kernel.org
> Signed-off-by: Tero Kristo <tero.kristo@...ux.intel.com>
> ---
>  kernel/trace/trace_events_synth.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c
> index 7fff8235075f..070365959c0a 100644
> --- a/kernel/trace/trace_events_synth.c
> +++ b/kernel/trace/trace_events_synth.c
> @@ -337,7 +337,7 @@ static void print_synth_event_num_val(struct trace_seq *s,
>  		break;
>  
>  	default:
> -		trace_seq_printf(s, print_fmt, name, val, space);
> +		trace_seq_printf(s, print_fmt, name, val->as_u64, space);
>  		break;
>  	}
>  }
> -- 
> 2.40.1
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>