Re: [PATCH 15/15] arch: add pkey and rseq syscall numbers everywhere

[Heiko Carstens]

On Fri, Jan 11, 2019 at 06:30:43PM +0100, Arnd Bergmann wrote:
> On Thu, Jan 10, 2019 at 9:36 PM Heiko Carstens
> <heiko.carstens@xxxxxxxxxx> wrote:
> > On Thu, Jan 10, 2019 at 05:24:35PM +0100, Arnd Bergmann wrote:
> 
> > Since you only need/want the system call numbers, could you please
> > change these lines to:
> >
> > > +384  common  pkey_alloc              -                               -
> > > +385  common  pkey_free               -                               -
> > > +386  common  pkey_mprotect           -                               -
> >
> > Otherwise it _looks_ like we would need compat wrappers here as well,
> > even though all of them would just jump to sys_ni_syscall() in this
> > case. Making this explicit seems to better.
> 
> Ok, fair enough. I considered doing this originally and then
> decided against it for consistency with the asm-generic file,
> but I don't care much either way.
> 
> Is this something you may want to add later? I'm not sure exactly
> how pkey compares to s390 storage keys, or if this is something
> completely unrelated.

I don't think pkeys will ever work on s390, since they require a key
per mapping, while the s390 storage keys are per physical page.