powerpc64le-linux-ld: arch/powerpc/platforms/pseries/lpar.o:undefined reference to `mmu_pid_bits'

[kernel test robot]

Hi Stephen,

It's probably a bug fix that unveils the link errors.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   64677779e8962c20b580b471790fe42367750599
commit: 18217da36103c25d87870624dfa569e6b9906a90 powerpc/64s/radix: Fix build failure with RADIX_MMU=n
date:   9 months ago
config: powerpc-randconfig-c004-20200621 (attached as .config)
compiler: powerpc64le-linux-gcc (GCC) 9.3.0

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

All errors (new ones prefixed by >>):

   powerpc64le-linux-ld: warning: orphan section `.gnu.hash' from `linker stubs' being placed in section `.gnu.hash'
>> powerpc64le-linux-ld: arch/powerpc/platforms/pseries/lpar.o:(.toc+0x0): undefined reference to `mmu_pid_bits'

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Attachment: .config.gz
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