ERROR: "__cmpxchg_u64" [drivers/net/ethernet/intel/i40e/i40e.ko] undefined!

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   4dfc2788033d30dfccfd4268e06dd73ce2c654ed
commit: 841c950d67c6facde32a8644ced20c04aebb7dd8 i40e/i40evf: use cmpxchg64 when updating private flags in ethtool
date:   2 weeks ago
config: parisc-allmodconfig (attached as .config)
compiler: hppa-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 841c950d67c6facde32a8644ced20c04aebb7dd8
        # save the attached .config to linux build tree
        make.cross ARCH=parisc 

All errors (new ones prefixed by >>):

>> ERROR: "__cmpxchg_u64" [drivers/net/ethernet/intel/i40e/i40e.ko] undefined!

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