Hi Michal,

[auto build test ERROR on next-20160229]
[also build test ERROR on v4.5-rc6]
[cannot apply to drm/drm-next drm-intel/for-linux-next v4.5-rc6 v4.5-rc5 v4.5-rc4]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Michal-Hocko/change-mmap_sem-taken-for-write-killable/20160229-213258
config: i386-randconfig-x004-201609 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   arch/x86/entry/vdso/vma.c: In function 'map_vdso':
>> arch/x86/entry/vdso/vma.c:177:6: error: implicit declaration of function 'down_write_killable' [-Werror=implicit-function-declaration]
     if (down_write_killable(&mm->mmap_sem))
         ^
   cc1: some warnings being treated as errors

vim +/down_write_killable +177 arch/x86/entry/vdso/vma.c

   171			addr = vdso_addr(current->mm->start_stack,
   172					 image->size - image->sym_vvar_start);
   173		} else {
   174			addr = 0;
   175		}
   176	
 > 177		if (down_write_killable(&mm->mmap_sem))
   178			return -EINTR;
   179	
   180		addr = get_unmapped_area(NULL, addr,

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