[mac80211-next:bpf 2/2] kernel/built-in.o:undefined reference to `stack_map_ops'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git 
bpf
head:   fe544432ea248442bc748639d66dbd6ac6a7cc5e
commit: fe544432ea248442bc748639d66dbd6ac6a7cc5e [2/2] bpf: remove struct 
bpf_map_type_list
config: m68k-sun3_defconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 4.9.0
reproduce:
        wget 
https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O 
~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout fe544432ea248442bc748639d66dbd6ac6a7cc5e
        # save the attached .config to linux build tree
        make.cross ARCH=m68k 

All errors (new ones prefixed by >>):

>> kernel/built-in.o:(.rodata+0x12ce): undefined reference to `stack_map_ops'

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.config.gz
Description: application/gzip