[aa:master 18/20] include/linux/mm.h:2885:10: error: implicit declaration of function 'page_trans_huge_anon_shared'

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/andrea/aa.git master
head:   61cbd7f8bc18730f4aa33c28db2c70b4d9b25768
commit: e81975bed240b9922b1c6cc36c95155b3621fc32 [18/20] gup: FOLL_DESHARE: copy-on-read fault
config: arm-randconfig-r002-20210115 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project d7bc3b7ce23b664d6620cdc32370a8614523ca2f)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://git.kernel.org/pub/scm/linux/kernel/git/andrea/aa.git/commit/?id=e81975bed240b9922b1c6cc36c95155b3621fc32
        git remote add aa https://git.kernel.org/pub/scm/linux/kernel/git/andrea/aa.git
        git fetch --no-tags aa master
        git checkout e81975bed240b9922b1c6cc36c95155b3621fc32
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 

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

All errors (new ones prefixed by >>):

   In file included from arch/arm/kernel/asm-offsets.c:12:
>> include/linux/mm.h:2885:10: error: implicit declaration of function 'page_trans_huge_anon_shared' [-Werror,-Wimplicit-function-declaration]
                   return page_trans_huge_anon_shared(page);
                          ^
   1 error generated.
--
   In file included from arch/arm/kernel/asm-offsets.c:12:
>> include/linux/mm.h:2885:10: error: implicit declaration of function 'page_trans_huge_anon_shared' [-Werror,-Wimplicit-function-declaration]
                   return page_trans_huge_anon_shared(page);
                          ^
   1 error generated.
   make[2]: *** [scripts/Makefile.build:117: arch/arm/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [Makefile:1206: prepare0] Error 2
   make[1]: Target 'modules_prepare' not remade because of errors.
   make: *** [Makefile:185: __sub-make] Error 2
   make: Target 'modules_prepare' not remade because of errors.
--
   In file included from arch/arm/kernel/asm-offsets.c:12:
>> include/linux/mm.h:2885:10: error: implicit declaration of function 'page_trans_huge_anon_shared' [-Werror,-Wimplicit-function-declaration]
                   return page_trans_huge_anon_shared(page);
                          ^
   1 error generated.
   make[2]: *** [scripts/Makefile.build:117: arch/arm/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [Makefile:1206: prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:185: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +/page_trans_huge_anon_shared +2885 include/linux/mm.h

  2874	
  2875	static inline bool gup_page_deshare(unsigned int flags,
  2876					    struct page *page)
  2877	{
  2878		if (flags & FOLL_WRITE)
  2879			return false;
  2880		if (!PageAnon(page))
  2881			return false;
  2882		if (PageHuge(page))
  2883			return false;
  2884		if (PageTransHuge(page))
> 2885			return page_trans_huge_anon_shared(page);
  2886		/* page_mapcount > 1 */
  2887		return atomic_read(&page->_mapcount) > 0;
  2888	}
  2889	

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

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