linux-kernel - Re: [kbuild-all] Re: drivers/platform/x86/thinkpad_acpi.c:4475:35: error: unused variable 'fwbug_cards

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Date:   Tue, 16 Nov 2021 13:40:50 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Philip Li <philip.li@...el.com>
Cc:     kernel test robot <lkp@...el.com>,
        Nathan Chancellor <nathan@...nel.org>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [kbuild-all] Re: drivers/platform/x86/thinkpad_acpi.c:4475:35:
 error: unused variable 'fwbug_cards_ids'

Hi,

On 11/16/21 13:34, Philip Li wrote:
> On Tue, Nov 16, 2021 at 11:26:48AM +0100, Hans de Goede wrote:
>> Hi,
>>
>> On 11/14/21 04:10, kernel test robot wrote:
>>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>>> head:   c8c109546a19613d323a319d0c921cb1f317e629
>>> commit: fd96e35ea7b95f1e216277805be89d66e4ae962d platform/x86: thinkpad_acpi: Fix bitwise vs. logical warning
>>> date:   4 weeks ago
>>> config: i386-buildonly-randconfig-r005-20211114 (attached as .config)
>>> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c3dddeeafb529e769cde87bd29ef6271ac6bfa5c)
>>> reproduce (this is a W=1 build):
>>>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>>         chmod +x ~/bin/make.cross
>>>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fd96e35ea7b95f1e216277805be89d66e4ae962d
>>>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>>         git fetch --no-tags linus master
>>>         git checkout fd96e35ea7b95f1e216277805be89d66e4ae962d
>>>         # save the attached .config to linux build tree
>>>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=i386 
>>>
>>> If you fix the issue, kindly add following tag as appropriate
>>> Reported-by: kernel test robot <lkp@...el.com>
>>>
>>> All errors (new ones prefixed by >>):
>>>
>>>>> drivers/platform/x86/thinkpad_acpi.c:4475:35: error: unused variable 'fwbug_cards_ids' [-Werror,-Wunused-const-variable]
>>>    static const struct pci_device_id fwbug_cards_ids[] __initconst = {
>>>                                      ^
>>>    1 error generated.
>>
>> So this *again* has absolutely nothing to do with the:
>>
>> "platform/x86: thinkpad_acpi: Fix bitwise vs. logical warning"
>>
>> commit, the problem is that:
>>
>> 1. the .config does not have CONFIG_PCI set; combined with:
>> 2. include/pci.h using a #define instead of a
>>    static inline for pci_dev_present() when this is the case
>> 3. This is a clang WERROR build
>>
>> I'll submit a fix for 2. upstream which should also fix
>> similar errors in a lot of other drivers.
>>
>> Again I must say that as a maintainer I'm unhappy about the amount
>> of noise being generated by clang WERROR builds here though,
>> is it really necessary for the kernel test robot to do builds
>> of this type ?
> Sorry Hans for the noise, we will look into this to consider the
> solution. And want to consult, do you specially have concern about
> -Wunused-const-variable or all W=1 related build issues?

Thank you.

W=1 is know to cause many many warnings, so to me it seems that
combining W=1 with CONFIG_WERROR=1 is a bad idea.

If it would be possible to avoid that combination then that would
be great.

Regards,

Hans






>>> vim +/fwbug_cards_ids +4475 drivers/platform/x86/thinkpad_acpi.c
>>>
>>> f7db839fccf087 Jiaxun Yang 2019-03-07  4474  
>>> f7db839fccf087 Jiaxun Yang 2019-03-07 @4475  static const struct pci_device_id fwbug_cards_ids[] __initconst = {
>>> f7db839fccf087 Jiaxun Yang 2019-03-07  4476  	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x24F3) },
>>> f7db839fccf087 Jiaxun Yang 2019-03-07  4477  	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x24FD) },
>>> f7db839fccf087 Jiaxun Yang 2019-03-07  4478  	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2526) },
>>> f7db839fccf087 Jiaxun Yang 2019-03-07  4479  	{}
>>> f7db839fccf087 Jiaxun Yang 2019-03-07  4480  };
>>> f7db839fccf087 Jiaxun Yang 2019-03-07  4481  
>>> f7db839fccf087 Jiaxun Yang 2019-03-07  4482  
>>>
>>> :::::: The code at line 4475 was first introduced by commit
>>> :::::: f7db839fccf087664e5587966220821289b6a9cb platform/x86: thinkpad_acpi: Disable Bluetooth for some machines
>>>
>>> :::::: TO: Jiaxun Yang <jiaxun.yang@...goat.com>
>>> :::::: CC: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>>>
>>> ---
>>> 0-DAY CI Kernel Test Service, Intel Corporation
>>> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
>>>
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