Comment 2 for bug 1711835

In file included from /var/lib/dkms/openafs/1.6.20/build/src/afs/LINUX/osi_machdep.h:129:0,
                 from /var/lib/dkms/openafs/1.6.20/build/src/afs/afs_osi.h:440,
                 from /var/lib/dkms/openafs/1.6.20/build/src/libafs/MODLOAD-4.12.0-11-generic-SP/afs_dir.c:70:
./arch/s390/include/asm/uaccess.h: In function ‘set_fs’:
./arch/s390/include/asm/uaccess.h:41:6: error: implicit declaration of function ‘uaccess_kernel’; did you mean ‘getname_kernel’? [-Werror=implicit-function-declaration]
  if (uaccess_kernel()) {
      ^~~~~~~~~~~~~~
      getname_kernel

It looks like this would be fixed by including uaccess.h instead of asm/uaccess.h, need to determine whether there's some kernel version limitation on this change though.