[QUESTION] powerpc, libseccomp, and spu

PowerPC experts,

Paul Moore and I are working on the v2.4 release of libseccomp,
and as part of this work I need to update the syscall table for
each architecture.

I have incorporated the new ppc syscall.tbl into libseccomp, but
I am not familiar with the value of "spu" in the ABI column.  For
example:

22	32	umount				sys_oldumount
22	64	umount				sys_ni_syscall
22	spu	umount				sys_ni_syscall

In libseccomp, we maintain a 32-bit ppc syscall table and a 64-bit
ppc syscall table.  Do we also need to add a "spu" ppc syscall
table?  Some clarification on the syscalls marked "spu" and "nospu"
would be greatly appreciated.

Thanks.

Tom