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

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Date:   Thu, 30 Jun 2022 17:21:14 +0800
From:   "Zhengyejian (Zetta)" <zhengyejian1@...wei.com>
To:     Greg KH <gregkh@...uxfoundation.org>
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 2022/6/30 14:33, Greg KH wrote:
> 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:

This patch is a cleanup, no need to include in stable kernel tree.
I accidentally copied the patch to stable mailbox, sorry for that :(

>      https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
> for how to do this properly.
> 
> </formletter>