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: mips-allyesconfig (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
        # save the attached .config to linux build tree
        make.cross ARCH=mips 

All errors (new ones prefixed by >>):

   arch/mips/kernel/vdso.c: In function 'arch_setup_additional_pages':
>> arch/mips/kernel/vdso.c:107:6: 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 +107 arch/mips/kernel/vdso.c

   101		struct mm_struct *mm = current->mm;
   102		unsigned long gic_size, vvar_size, size, base, data_addr, vdso_addr;
   103		struct vm_area_struct *vma;
   104		struct resource gic_res;
   105		int ret;
   106	
 > 107		if (down_write_killable(&mm->mmap_sem))
   108			return -EINTR;
   109	
   110		/*

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