[PATCH] powerpc: Enable demuxed sysv IPC syscalls

[Arnd Bergmann]

On Wednesday 16 December 2015 09:42:53 Andreas Schwab wrote:
> Michael Ellerman <mpe@ellerman.id.au> writes:
> 
> > Having said that it doesn't seem like it buys us that much. Just that userspace
> > no longer has to worry about passing IPC_64, or is there more to it that I'm
> > missing? I guess that's a worthwhile cleanup though.
> 
> By removing the requirement to add IPC_64 you remove the need for a
> special wrapper, and the syscalls can be implemented by just adding it
> to syscalls.list.  That should be the goal for every new syscall.  Also,
> it doesn't make sense to offer obsolete interfaces (the non-IPC_64
> variants) through such syscalls.

Right, the other point is that we can do it consistently for all
architectures that currently don't have separate ipc syscalls but
may want to add them.

I made a table when this first came up:
https://docs.google.com/spreadsheets/d/18GxXEHE2ywnSr-SPoGFd1ABz6wEM1ex-JMu5lEraaH8

So the affected architectures are cris, frv, m32r, m68k, mips-o32, mn10300,
s390, sh, sparc and x86.

	Arnd