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

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Message-ID: <634e887e-4d22-ea90-0ea3-14b9cad9396b@intel.com>
Date:   Fri, 8 Apr 2022 11:34:18 +0800
From:   "Chen, Rong A" <rong.a.chen@...el.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        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 4/7/2022 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

> 
> $ 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.
>