Hi Daniel,

[auto build test ERROR on v4.5-rc3]
[also build test ERROR on next-20160208]
[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/Daniel-Wagner/Differentiate-between-32-and-64-bit-ELF-header/20160208-234759
config: mips-fuloong2e_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
        # save the attached .config to linux build tree
        make.cross ARCH=mips 

All error/warnings (new ones prefixed by >>):

   arch/mips/kernel/../../../fs/binfmt_elf.c: In function 'load_elf_interp':
>> arch/mips/kernel/binfmt_elfn32.c:38:7: error: implicit declaration of function 'mips_elf_check_machine' [-Werror=implicit-function-declaration]
     if (!mips_elf_check_machine(__h))    \
          ^
>> arch/mips/kernel/../../../fs/binfmt_elf.c:536:7: note: in expansion of macro 'elf_check_arch'
     if (!elf_check_arch(interp_elf_ex))
          ^
   cc1: some warnings being treated as errors
--
   arch/mips/kernel/../../../fs/binfmt_elf.c: In function 'load_elf_interp':
>> arch/mips/kernel/binfmt_elfo32.c:50:7: error: implicit declaration of function 'mips_elf_check_machine' [-Werror=implicit-function-declaration]
     if (!mips_elf_check_machine(__h))    \
          ^
>> arch/mips/kernel/../../../fs/binfmt_elf.c:536:7: note: in expansion of macro 'elf_check_arch'
     if (!elf_check_arch(interp_elf_ex))
          ^
   cc1: some warnings being treated as errors

vim +/mips_elf_check_machine +38 arch/mips/kernel/binfmt_elfn32.c

    32	 */
    33	#define elf_check_arch(hdr)						\
    34	({									\
    35		int __res = 1;							\
    36		struct elfhdr *__h = (hdr);					\
    37										\
  > 38		if (!mips_elf_check_machine(__h))				\
    39			__res = 0;						\
    40		if (__h->e_ident[EI_CLASS] != ELFCLASS32)			\
    41			__res = 0;						\

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