linux-kernel - Re: Cleaning up numbering for new x86 syscalls?

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Message-ID: <20181120180741.iu6bcjprjxeqllem@treble>
Date:   Tue, 20 Nov 2018 12:07:41 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Florian Weimer <fweimer@...hat.com>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Tycho Andersen <tycho@...ho.ws>,
        Daniel Colascione <dancol@...gle.com>,
        Carlos O'Donell <carlos@...hat.com>,
        Rich Felker <dalias@...c.org>,
        Adhemerval Zanella <adhemerval.zanella@...aro.org>
Subject: Re: Cleaning up numbering for new x86 syscalls?

On Tue, Nov 20, 2018 at 07:23:09AM -0800, Andy Lutomirski wrote:
> On Tue, Nov 20, 2018 at 1:03 AM Florian Weimer <fweimer@...hat.com> wrote:
> >
> > * Andy Lutomirski:
> >
> > > 5. Adjust the scripts so that we only have to wire up new syscalls
> > > once.  They'll have a nr above 1024, and they'll have the same nr on
> > > all x86 variants.
> >
> > Is there a sufficiently sized gap on all other architectures as well?
> > The restriction to the x86 variants seems arbitrary to me.
> >
> 
> Fair point.  We have this shiny "generic" syscall list.  Maybe we can
> get x86 synced up with it for new syscalls.

I heard this discussed at Plumbers.  There was a proposal to use the
same syscall numbers across architectures.  Also, when adding new
generic syscalls, they want all arches to be wired up at the same time.

  https://linuxplumbersconf.org/event/2/contributions/149/attachments/129/161/Ideas_to_improve_glibc_and_Kernel_interaction.pdf

Adding Adhemerval to CC.

-- 
Josh