linux-kernel - Re: [PATCH] tracing/histograms: Simplify create_hist

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Date:   Thu, 30 Jun 2022 08:33:24 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Zheng Yejian <zhengyejian1@...wei.com>
Cc:     rostedt@...dmis.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org, tom.zanussi@...ux.intel.com,
        trix@...hat.com, stable@...r.kernel.org, zhangjinhao2@...wei.com
Subject: Re: [PATCH] tracing/histograms: Simplify create_hist_fields()

On Thu, Jun 30, 2022 at 09:31:52AM +0800, Zheng Yejian wrote:
> When I look into implements of create_hist_fields(), I think there can be
> following two simplifications:
>   1. If something wrong happened in parse_var_defs(), free_var_defs() would
>      have been called in it, so no need goto free again after calling it;
>   2. After calling create_key_fields(), regardless of the value of 'ret', it
>      then always runs into 'out: ', so the judge of 'ret' is redundant.
> 
> No functional changes.
> 
> Signed-off-by: Zheng Yejian <zhengyejian1@...wei.com>
> ---
>  kernel/trace/trace_events_hist.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
> index 2784951e0fc8..832c4ccf41ab 100644
> --- a/kernel/trace/trace_events_hist.c
> +++ b/kernel/trace/trace_events_hist.c
> @@ -4454,7 +4454,7 @@ static int create_hist_fields(struct hist_trigger_data *hist_data,
>  
>  	ret = parse_var_defs(hist_data);
>  	if (ret)
> -		goto out;
> +		return ret;
>  
>  	ret = create_val_fields(hist_data, file);
>  	if (ret)
> @@ -4465,8 +4465,7 @@ static int create_hist_fields(struct hist_trigger_data *hist_data,
>  		goto out;
>  
>  	ret = create_key_fields(hist_data, file);
> -	if (ret)
> -		goto out;
> +
>   out:
>  	free_var_defs(hist_data);
>  
> -- 
> 2.32.0
> 

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>