linux-kernel - Re: [krzk-mem-ctrl:for-v5.17/renesas-rpc 5/5] drivers/memory/renesas-rpc-if.c:253:14: warning: cast to smaller integer type 'enum rpcif

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Date:   Sun, 21 Nov 2021 13:30:50 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     kernel test robot <lkp@...el.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Biju Das <biju.das.jz@...renesas.com>,
        Wolfram Sang <wsa-dev@...g-engineering.com>
Subject: Re: [krzk-mem-ctrl:for-v5.17/renesas-rpc 5/5]
 drivers/memory/renesas-rpc-if.c:253:14: warning: cast to smaller integer type
 'enum rpcif_type' from 'const void *'

On 17/11/2021 09:27, Krzysztof Kozlowski wrote:
> On 17/11/2021 04:56, kernel test robot wrote:
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux-mem-ctrl.git for-v5.17/renesas-rpc
>> head:   b04cc0d912eb80d3c438b11d96ca847c3e77e8ab
>> commit: b04cc0d912eb80d3c438b11d96ca847c3e77e8ab [5/5] memory: renesas-rpc-if: Add support for RZ/G2L
>> config: x86_64-buildonly-randconfig-r002-20211116 (attached as .config)
>> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 4c2cf3a314d9131b1b288e7c8ab0c75ac1b2be1d)
>> 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/krzk/linux-mem-ctrl.git/commit/?id=b04cc0d912eb80d3c438b11d96ca847c3e77e8ab
>>         git remote add krzk-mem-ctrl https://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux-mem-ctrl.git
>>         git fetch --no-tags krzk-mem-ctrl for-v5.17/renesas-rpc
>>         git checkout b04cc0d912eb80d3c438b11d96ca847c3e77e8ab
>>         # save the attached .config to linux build tree
>>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@...el.com>
>>
>> All warnings (new ones prefixed by >>):
>>
>>>> drivers/memory/renesas-rpc-if.c:253:14: warning: cast to smaller integer type 'enum rpcif_type' from 'const void *' [-Wvoid-pointer-to-enum-cast]
>>            rpc->type = (enum rpcif_type)of_device_get_match_data(dev);
>>                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>    1 warning generated.
>>
> 
> I am afraid several drivers repeat this pattern and will be affected as
> well on clang. GCC does not complain (apparently cast is enough for
> GCC), but still this has to be fixed. Maybe cast via  uintptr_t would
> quite it?
> 
> Let me know when I can expect the fix.
> 

Any progress on fixing this one? It blocks entire set (and further
Wolfram's patches) from being included in pull-request and might be
postponed till next release.


Best regards,
Krzysztof