linux-kernel - Re: [kbuild-all] Re: mm/khugepaged.c:2046:56: warning: 'struct khugepaged_mm_slot' declared inside parameter list will not be visible outside of this definition or declaration

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Date:   Mon, 5 Sep 2022 10:02:05 +0800
From:   "Chen, Rong A" <rong.a.chen@...el.com>
To:     Qi Zheng <zhengqi.arch@...edance.com>,
        kernel test robot <lkp@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [kbuild-all] Re: mm/khugepaged.c:2046:56: warning: 'struct
 khugepaged_mm_slot' declared inside parameter list will not be visible
 outside of this definition or declaration



On 9/2/2022 11:37 PM, Qi Zheng wrote:
> 
> 
> On 2022/9/2 22:23, kernel test robot wrote:
>> tree:   
>> https://github.com/intel-lab-lkp/linux/commits/UPDATE-20220901-154717/Qi-Zheng/add-common-struct-mm_slot-and-use-it-in-THP-and-KSM/20220831-112149 
>>
>> head:   32b787e37af17f7fe75f9b9c9bb22bf044722229
>> commit: 7ad02cf1645071c2bf1ed6ae0e48907aa0a3119e mm: thp: fix build 
>> error with CONFIG_SHMEM disabled
>> date:   30 hours ago
>> config: sparc-randconfig-r023-20220901 
>> (https://download.01.org/0day-ci/archive/20220902/202209022248.TEjW4Cld-lkp@intel.com/config) 
>>
>> compiler: sparc64-linux-gcc (GCC) 12.1.0
>> 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://github.com/intel-lab-lkp/linux/commit/7ad02cf1645071c2bf1ed6ae0e48907aa0a3119e 
>>
>>          git remote add linux-review 
>> https://github.com/intel-lab-lkp/linux
>>          git fetch --no-tags linux-review 
>> UPDATE-20220901-154717/Qi-Zheng/add-common-struct-mm_slot-and-use-it-in-THP-and-KSM/20220831-112149 
>>
>>          git checkout 7ad02cf1645071c2bf1ed6ae0e48907aa0a3119e
>>          # save the config file
>>          mkdir build_dir && cp config build_dir/.config
>>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 
>> make.cross W=1 O=build_dir ARCH=sparc SHELL=/bin/bash
>>
>> If you fix the issue, kindly add following tag where applicable
>> Reported-by: kernel test robot <lkp@...el.com>
>>
>> All warnings (new ones prefixed by >>):
>>
>>>> mm/khugepaged.c:2046:56: warning: 'struct khugepaged_mm_slot' 
>>>> declared inside parameter list will not be visible outside of this 
>>>> definition or declaration
>>      2046 | static void khugepaged_collapse_pte_mapped_thps(struct 
>> khugepaged_mm_slot *mm_slot)
>>           |                                                        
>> ^~~~~~~~~~~~~~~~~~
>>     mm/khugepaged.c: In function 'khugepaged_scan_mm_slot':
>>     mm/khugepaged.c:2076:45: error: passing argument 1 of 
>> 'khugepaged_collapse_pte_mapped_thps' from incompatible pointer type 
>> [-Werror=incompatible-pointer-types]
>>      2076 |         khugepaged_collapse_pte_mapped_thps(mm_slot);
>>           |                                             ^~~~~~~
>>           |                                             |
>>           |                                             struct mm_slot *
> 
> It looks like the robot tested "mm: thp: fix build error with
> CONFIG_SHMEM disabled" alone without "[PATCH v2 2/7] mm: thp: convert to
> use common struct mm_slot". So this is a false positive.

Hi Qi,

Thanks for the explanation, you are right, the robot was considered this
patch as a replacement of "[PATCH v2 2/7] mm: thp: convert to use common
struct mm_slot".

Best Regards,
Rong Chen

> 
>>     mm/khugepaged.c:2046:76: note: expected 'struct khugepaged_mm_slot 
>> *' but argument is of type 'struct mm_slot *'
>>      2046 | static void khugepaged_collapse_pte_mapped_thps(struct 
>> khugepaged_mm_slot *mm_slot)
>>           |                                                 
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
>>     cc1: some warnings being treated as errors
>>
>>
>> vim +2046 mm/khugepaged.c
>>
>>    2045
>>> 2046    static void khugepaged_collapse_pte_mapped_thps(struct 
>>> khugepaged_mm_slot *mm_slot)
>>    2047    {
>>    2048    }
>>    2049    #endif
>>    2050
>>
>