linux-kernel - Re: [kbuild-all] Re: drivers/cxl/pci.c:439:7: warning: Local variable 'rc' shadows outer variable [shadowVariable]

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Date:   Thu, 7 Apr 2022 21:37:16 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     "Chen, Rong A" <rong.a.chen@...el.com>,
        kernel test robot <lkp@...el.com>,
        Ben Widawsky <ben.widawsky@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Dan Williams <dan.j.williams@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [kbuild-all] Re: drivers/cxl/pci.c:439:7: warning: Local variable
 'rc' shadows outer variable [shadowVariable]



On 4/7/22 20:34, Chen, Rong A wrote:
> 
> 
> On 4/7/2022 8:11 AM, Randy Dunlap wrote:
>>
>>
>> On 4/6/22 04:17, Chen, Rong A wrote:
>>>
>>>
>>> On 4/4/2022 3:29 AM, Randy Dunlap wrote:
>>>> Hi lkp/ktr,
>>>>
>>>> On 4/2/22 04:26, kernel test robot wrote:
>>>>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>>>>> head:   88e6c0207623874922712e162e25d9dafd39661e
>>>>> commit: 523e594d9cc03db962c741ce02c8a58aab58a123 cxl/pci: Implement wait for media active
>>>>> date:   7 weeks ago
>>>>> compiler: alpha-linux-gcc (GCC) 11.2.0
>>>>>
>>>>> If you fix the issue, kindly add following tag as appropriate
>>>>> Reported-by: kernel test robot <lkp@...el.com>
>>>>>
>>>>>
>>>>> cppcheck warnings: (new ones prefixed by >>)
>>>>>>> drivers/cxl/pci.c:439:7: warning: Local variable 'rc' shadows outer variable [shadowVariable]
>>>>>        int rc;
>>>>>            ^
>>>>>      drivers/cxl/pci.c:431:6: note: Shadowed declaration
>>>>>       int rc, i;
>>>>>           ^
>>>>>      drivers/cxl/pci.c:439:7: note: Shadow variable
>>>>>        int rc;
>>>>>            ^
>>>>>
>>>>> cppcheck possible warnings: (new ones prefixed by >>, may not real problems)
>>>>>
>>>>>>> drivers/cxl/port.c:63:1: warning: There is an unknown macro here somewhere. Configuration is required. If __stringify is a macro then please configure it. [unknownMacro]
>>>>>      MODULE_ALIAS_CXL(CXL_DEVICE_PORT);
>>>>>      ^
>>>>> -- 
>>>>
>>>> Can you provide a cppcheck config file and command line
>>>> for this, please?
>>>
>>> Hi Randy,
>>>
>>> The below command can show the warning:
>>> $ cppcheck --quiet --enable=style,performance,portability --template=gcc drivers/cxl/port.c
>>> drivers/cxl/port.c:63:1: warning: There is an unknown macro here somewhere. Configuration is required. If __stringify is a macro then please configure it. [unknownMacro]
>>> MODULE_ALIAS_CXL(CXL_DEVICE_PORT);
>>> ^
>>
>> Hm, that still shows me nothing. There must be something else.
>> Maybe it's version-related?  I have:
> 
> Hi Randy,
> 
> I'm using version 2.3:
> 
> $ cppcheck --version
> Cppcheck 2.3
> 
> and I can't see the warning too if using Cppcheck 1.86.
> 
> Best Regards,
> Rong Chen

Hi Rong,

I downloaded version  2.7 and I can see the warnings now.

Thanks!

>>
>> $ cppcheck --version
>> Cppcheck 1.82
>>
>>>
>>> Best Regards,
>>> Rong Chen
>>>
>>>>
>>>> My naive testing does not see any of these warnings --
>>>> although I can easily spot the problems in the source file.
>>>>
>>>> thanks.
>>
>> thanks.
>>

-- 
~Randy