linux-kernel - 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:   Fri, 2 Sep 2022 22:23:47 +0800
From:   kernel test robot <lkp@...el.com>
To:     Qi Zheng <zhengqi.arch@...edance.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        0day robot <lkp@...el.com>
Subject: mm/khugepaged.c:2046:56: warning: 'struct khugepaged_mm_slot'
 declared inside parameter list will not be visible outside of this
 definition or declaration

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 *
   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	

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