[mmotm:master 50/189] include/linux/swapops.h:220:9: error: implicit declaration of function '__pmd'

[kbuild test robot <fengguang.wu@intel.com>]

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tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   7961d18ba492e06ad240d37a5502c418b5f0a928
commit: 25faf0ef110322719330fcadf4fe541528bacd4d [50/189] mm-thp-enable-thp-migration-in-generic-path-fix
config: sparc-defconfig (attached as .config)
compiler: sparc-linux-gcc (GCC) 6.2.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 25faf0ef110322719330fcadf4fe541528bacd4d
        # save the attached .config to linux build tree
        make.cross ARCH=sparc 

All errors (new ones prefixed by >>):

   In file included from fs/proc/task_mmu.c:15:0:
   include/linux/swapops.h: In function 'swp_entry_to_pmd':
>> include/linux/swapops.h:220:9: error: implicit declaration of function '__pmd' [-Werror=implicit-function-declaration]
     return __pmd(0);
            ^~~~~
>> include/linux/swapops.h:220:9: error: incompatible types when returning type 'int' but 'pmd_t {aka struct <anonymous>}' was expected
     return __pmd(0);
            ^~~~~~~~
   cc1: some warnings being treated as errors

vim +/__pmd +220 include/linux/swapops.h

   217	
   218	static inline pmd_t swp_entry_to_pmd(swp_entry_t entry)
   219	{
 > 220		return __pmd(0);
   221	}
   222	

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