[linux-next:master 8414/12330] drivers/net/dsa/ocelot/seville_vsc9953.c:1107:34: warning: unused variable 'seville_of_match'

[linux-next:master 8414/12330] drivers/net/dsa/ocelot/seville_vsc9953.c:1107:34: warning: unused variable 'seville_of_match'

[kernel test robot]

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Hi Vladimir,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   de69ee6df1cfbf3c67787d8504fd21b59da39572
commit: d60bc62de4ae068ed4b215c24cdfdd5035aa986e [8414/12330] net: dsa: seville: build as separate module
config: x86_64-randconfig-r002-20200930 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project bcd05599d0e53977a963799d6ee4f6e0bc21331b)
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
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=d60bc62de4ae068ed4b215c24cdfdd5035aa986e
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout d60bc62de4ae068ed4b215c24cdfdd5035aa986e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/net/dsa/ocelot/seville_vsc9953.c:1107:34: warning: unused variable 'seville_of_match' [-Wunused-const-variable]
   static const struct of_device_id seville_of_match[] = {
                                    ^
   1 warning generated.

vim +/seville_of_match +1107 drivers/net/dsa/ocelot/seville_vsc9953.c

84705fc165526e8 Maxim Kochetkov 2020-07-13  1106  
84705fc165526e8 Maxim Kochetkov 2020-07-13 @1107  static const struct of_device_id seville_of_match[] = {
84705fc165526e8 Maxim Kochetkov 2020-07-13  1108  	{ .compatible = "mscc,vsc9953-switch" },
84705fc165526e8 Maxim Kochetkov 2020-07-13  1109  	{ },
84705fc165526e8 Maxim Kochetkov 2020-07-13  1110  };
84705fc165526e8 Maxim Kochetkov 2020-07-13  1111  MODULE_DEVICE_TABLE(of, seville_of_match);
84705fc165526e8 Maxim Kochetkov 2020-07-13  1112  

:::::: The code at line 1107 was first introduced by commit
:::::: 84705fc165526e8e55d208b2b10a48cc720a106a net: dsa: felix: introduce support for Seville VSC9953 switch

:::::: TO: Maxim Kochetkov <fido_max@inbox.ru>
:::::: CC: David S. Miller <davem@davemloft.net>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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Re: [linux-next:master 8414/12330] drivers/net/dsa/ocelot/seville_vsc9953.c:1107:34: warning: unused variable 'seville_of_match'

[Vladimir Oltean]

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On Thu, Oct 01, 2020 at 02:51:06AM +0800, kernel test robot wrote:
> Hi Vladimir,
> 
> First bad commit (maybe != root cause):
> 
> tree:   (URL mangled by my smart and secure company)
> head:   de69ee6df1cfbf3c67787d8504fd21b59da39572
> commit: d60bc62de4ae068ed4b215c24cdfdd5035aa986e [8414/12330] net: dsa: seville: build as separate module
> config: x86_64-randconfig-r002-20200930 (attached as .config)
> compiler: clang version 12.0.0 (URL mangled by my smart and secure company)
> reproduce (this is a W=1 build):
>         wget (URL mangled by my smart and secure company) -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install x86_64 cross compiling tool for clang build
>         # apt-get install binutils-x86-64-linux-gnu
>         # (URL mangled by my smart and secure company)
>         git remote add linux-next (URL mangled by my smart and secure company)
>         git fetch --no-tags linux-next master
>         git checkout d60bc62de4ae068ed4b215c24cdfdd5035aa986e
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
> 
> All warnings (new ones prefixed by >>):
> 
> >> drivers/net/dsa/ocelot/seville_vsc9953.c:1107:34: warning: unused variable 'seville_of_match' [-Wunused-const-variable]
>    static const struct of_device_id seville_of_match[] = {
>                                     ^
>    1 warning generated.
> 
> vim +/seville_of_match +1107 drivers/net/dsa/ocelot/seville_vsc9953.c
> 
> 84705fc165526e8 Maxim Kochetkov 2020-07-13  1106  
> 84705fc165526e8 Maxim Kochetkov 2020-07-13 @1107  static const struct of_device_id seville_of_match[] = {
> 84705fc165526e8 Maxim Kochetkov 2020-07-13  1108  	{ .compatible = "mscc,vsc9953-switch" },
> 84705fc165526e8 Maxim Kochetkov 2020-07-13  1109  	{ },
> 84705fc165526e8 Maxim Kochetkov 2020-07-13  1110  };
> 84705fc165526e8 Maxim Kochetkov 2020-07-13  1111  MODULE_DEVICE_TABLE(of, seville_of_match);
> 84705fc165526e8 Maxim Kochetkov 2020-07-13  1112  
> 
> :::::: The code at line 1107 was first introduced by commit
> :::::: 84705fc165526e8e55d208b2b10a48cc720a106a net: dsa: felix: introduce support for Seville VSC9953 switch
> 
> :::::: TO: Maxim Kochetkov <fido_max@inbox.ru>
> :::::: CC: David S. Miller <davem@davemloft.net>
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> (URL mangled by my smart and secure company)

Can a human explain to me what's the problem here? Is it because struct
of_device_id is not used on non-device tree platforms? And if so, what
is the "fix"?