linux-kernel - Re: \\ 答复: [PATCH] of: del redundant type conversion

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Date:   Wed, 10 Apr 2019 21:21:59 -0700
From:   Frank Rowand <frowand.list@...il.com>
To:     xiaojiangfeng <xiaojiangfeng@...wei.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "robh@...nel.org" <robh@...nel.org>
Cc:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: \\ 答复: [PATCH] of: del redundant type conversion

On 4/10/19 9:13 PM, Frank Rowand wrote:
> On 4/10/19 6:51 PM, xiaojiangfeng wrote:
>> My pleasure.
>>
>> I am very new to sparse.
>>
>> I guess the warning is caused by the macro min.
> 
> I think the warning is likely because the type of data is 'void *'.
> 
> Removing the (int) cast is a good fix, but does not resolve
> the sparse warning.

Let me correct myself.  When I ran sparse, I see the removing min() does
eliminate the sparse warning.  I'm not sure why, so I'll go dig a little
deeper.

-Frank

> 
> -Frank
> 
> 
>> Then I submitted my changes.
>>
>> Thanks for code review.
>>
>>
>> -----邮件原件-----
>> 发件人: Frank Rowand [mailto:frowand.list@...il.com] 
>> 发送时间: 2019年4月11日 2:50
>> 收件人: xiaojiangfeng <xiaojiangfeng@...wei.com>; robh+dt@...nel.org; robh@...nel.org
>> 抄送: devicetree@...r.kernel.org; linux-kernel@...r.kernel.org
>> 主题: Re: [PATCH] of: del redundant type conversion
>>
>> On 4/10/19 1:29 AM, xiaojiangfeng wrote:
>>> The type of variable l in early_init_dt_scan_chosen is int, there is 
>>> no need to convert to int.
>>>
>>> Signed-off-by: xiaojiangfeng <xiaojiangfeng@...wei.com>
>>> ---
>>>  drivers/of/fdt.c | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 
>>> 4734223..de893c9 100644
>>> --- a/drivers/of/fdt.c
>>> +++ b/drivers/of/fdt.c
>>> @@ -1091,7 +1091,7 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
>>>  	/* Retrieve command line */
>>>  	p = of_get_flat_dt_prop(node, "bootargs", &l);
>>>  	if (p != NULL && l > 0)
>>> -		strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
>>> +		strlcpy(data, p, min(l, COMMAND_LINE_SIZE));
>>>  
>>>  	/*
>>>  	 * CONFIG_CMDLINE is meant to be a default in case nothing else
>>>
>>
>> Thanks for catching the redundant cast.
>>
>> There is a second problem detected by sparse on that line:
>>
>>   drivers/of/fdt.c:1094:34: warning: expression using sizeof(void)
>>
>> Can you please fix both issues?
>>
>> Thanks,
>>
>> Frank
>>
> 
>