ERROR: "ia64_delay_loop" [drivers/spi/spi-thunderx.ko] undefined!

[kbuild test robot]

Hi Robin,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   97ace515f01439d4cf6e898b4094040dc12d36e7
commit: e1a50de37860b3a93a9d643b09638db5aff47650 arm64: cputype: Silence Sparse warnings
date:   12 days ago
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 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
        git checkout e1a50de37860b3a93a9d643b09638db5aff47650
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

All errors (new ones prefixed by >>):

>> ERROR: "ia64_delay_loop" [drivers/spi/spi-thunderx.ko] undefined!
   ERROR: "ia64_delay_loop" [drivers/net/phy/mdio-cavium.ko] undefined!

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