Hi Martijn,

I love your patch! Yet something to improve:

[auto build test ERROR on staging/staging-testing]
[also build test ERROR on v4.17-rc3 next-20180504]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Martijn-Coenen/ANDROID-binder-remove-32-bit-binder-interface/20180505-130632
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=m68k 

All errors (new ones prefixed by >>):

   drivers/android/binder.o: In function `binder_thread_write':
>> binder.c:(.text+0x6a16): undefined reference to `__get_user_bad'
   binder.c:(.text+0x6c9a): undefined reference to `__get_user_bad'
   binder.c:(.text+0x701e): undefined reference to `__get_user_bad'
   binder.c:(.text+0x7414): undefined reference to `__get_user_bad'

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