Re: [PATCH 2/3] powerpc: Add system call table generation support

[Arnd Bergmann]

On Tue, Sep 25, 2018 at 2:48 AM Michael Ellerman <mpe@xxxxxxxxxxxxxx> wrote:
> Arnd Bergmann <arnd@xxxxxxxx> writes:
> > On Tue, Sep 18, 2018 at 2:15 PM Firoz Khan <firoz.khan@xxxxxxxxxx> wrote:
> >> On 14 September 2018 at 15:31, Arnd Bergmann <arnd@xxxxxxxx> wrote:
> >> > On Fri, Sep 14, 2018 at 10:33 AM Firoz Khan <firoz.khan@xxxxxxxxxx> wrote:
> >
> > But all three existing architectures (x86, s390 and arm) already
> > have the capability to parse the table and generate different output
> > from that.
>
> Yeah, we want that on powerpc too.
>
> If the script needs to be more complex that's fine, if it can't be
> shared across arches that's fine, the main thing for me is that wiring
> up a syscall can be done by adding a single line in a single file.

Yes, that's definitely the idea, we want to make it easier for everyone.
We need at least a special case for mips, which needs three separate
input files (the tables are completely different) to generate four versions
of the output, plus a future extension to use the generic table for their
new one.

For powerpc, I'm hoping that both the table format and script can be
completely generic and not need a special case that is different
from the others, but if we need some extra magic to handle the SPU
syscalls, we can still do that with a private script.

      Arnd