linux-kernel - Re: [PATCH v1 3/9] perf util: Reconstruct rblist for supporting per-thread shadow stats

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Date:   Wed, 22 Nov 2017 20:03:33 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>, acme@...nel.org,
        jolsa@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, Linux-kernel@...r.kernel.org,
        ak@...ux.intel.com, kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v1 3/9] perf util: Reconstruct rblist for supporting
 per-thread shadow stats



On 11/22/2017 4:32 PM, Jiri Olsa wrote:
> On Wed, Nov 22, 2017 at 02:57:12PM +0800, Jin, Yao wrote:
>>
>>
>> On 11/22/2017 2:31 PM, Ravi Bangoria wrote:
>>>
>>> On 11/20/2017 08:13 PM, Jin Yao wrote:
>>>> @@ -76,6 +97,17 @@ static struct rb_node *saved_value_new(struct
>>>> rblist *rblist __maybe_unused,
>>>>        return &nd->rb_node;
>>>>    }
>>>>
>>>> +static void saved_value_delete(struct rblist *rblist __maybe_unused,
>>>> +                   struct rb_node *rb_node)
>>>> +{
>>>> +    struct saved_value *v = container_of(rb_node,
>>>> +                         struct saved_value,
>>>> +                         rb_node);
>>>> +
>>>> +    if (v)
>>>> +        free(v);
>>>> +}
>>>
>>> Do we really need if(v) ?
>>>
>>> Thanks,
>>> Ravi
>>>
>>
>> Hi Ravi,
>>
>> Looks it doesn't need if(v).
>>
>> I put if(v) here is from my coding habits (checking pointer before free).
>>
>> It's OK for me if you think the code should be removed.
> 
> you could add BUG_ON(!rb_node);
> 
> jirka
> 

Good idea! I will add BUG_ON checking there.

Thanks
Jin Yao