tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   e55a38145ac0946f090895afc5c8ba0717790908
commit: add8ee4dd125729fb48d5cc73b194f28f1a6eccb [120/255] mm/thp: split out pmd collapse/flush into separate functions
config: m68k-multi_defconfig (attached as .config)
reproduce:
  wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
  chmod +x ~/bin/make.cross
  git checkout add8ee4dd125729fb48d5cc73b194f28f1a6eccb
  # save the attached .config to linux build tree
  make.cross ARCH=m68k 

All warnings:

   In file included from arch/m68k/include/asm/pgtable_mm.h:172:0,
                    from arch/m68k/include/asm/pgtable.h:4,
                    from include/linux/mm.h:53,
                    from include/linux/scatterlist.h:6,
                    from include/linux/dmaengine.h:24,
                    from include/linux/netdevice.h:38,
                    from net/batman-adv/main.h:168,
                    from net/batman-adv/bat_iv_ogm.c:18:
   include/asm-generic/pgtable.h: In function 'pmdp_collapse_flush':
   include/asm-generic/pgtable.h:206:2: warning: missing braces around initializer [-Wmissing-braces]
     return __pmd(0);
     ^
>> include/asm-generic/pgtable.h:206:2: warning: (near initialization for '(anonymous).pmd') [-Wmissing-braces]

vim +206 include/asm-generic/pgtable.h

   190	#endif
   191	
   192	#ifndef pmdp_collapse_flush
   193	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
   194	static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
   195						unsigned long address,
   196						pmd_t *pmdp)
   197	{
   198		return pmdp_clear_flush(vma, address, pmdp);
   199	}
   200	#else
   201	static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
   202						unsigned long address,
   203						pmd_t *pmdp)
   204	{
   205		BUILD_BUG();
 > 206		return __pmd(0);
   207	}
   208	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
   209	#endif
   210	
   211	#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
   212	extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
   213					       pgtable_t pgtable);
   214	#endif

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