ERROR: "process_buffer_measurement" [security/integrity/ima/ima_asymmetric_keys.ko] undefined!

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git next-integrity
head:   f47825c694851955fa4c492dd56809621529b086
commit: 88e70da170e8945f6b1c1299083d1b942705beb5 IMA: Define an IMA hook to measure keys
date:   3 weeks ago
config: i386-randconfig-c002-20200103 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-3) 7.5.0
reproduce:
        git checkout 88e70da170e8945f6b1c1299083d1b942705beb5
        # save the attached .config to linux build tree
        make ARCH=i386 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <redacted>

All errors (new ones prefixed by >>):

   WARNING: modpost: missing MODULE_LICENSE() in security/integrity/ima/ima_asymmetric_keys.o
   see include/linux/module.h for more information

quoted

ERROR: "process_buffer_measurement" [security/integrity/ima/ima_asymmetric_keys.ko] undefined!

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