ERROR: "ap_driver_register" undefined!

From: kernel test robot
Date: Tue Aug 04 2020 - 10:38:45 EST

tree: master
head: c0842fbc1b18c7a044e6ff3e8fa78bfa822c7d1a
commit: e93a1695d7fb551376b1c1220a267d032b6ad159 iommu: Enable compile testing for some of drivers
date: 5 months ago
config: s390-randconfig-m031-20200804 (attached as .config)
compiler: s390-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout e93a1695d7fb551376b1c1220a267d032b6ad159
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

>> ERROR: "ap_driver_register" [drivers/s390/crypto/vfio_ap.ko] undefined!
>> ERROR: "ap_driver_unregister" [drivers/s390/crypto/vfio_ap.ko] undefined!

0-DAY CI Kernel Test Service, Intel Corporation

Attachment: .config.gz
Description: application/gzip