linux-kernel - Re: [PATCH v3 7/7] ia64: wire up system calls

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Message-ID: <CAK8P3a3OS-aKFrb5g1i00-+G1+uZqEkH0C1FX08tTx=-89-hfQ@mail.gmail.com>
Date:   Thu, 11 Oct 2018 09:24:43 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Firoz Khan <firoz.khan@...aro.org>
Cc:     linux-ia64@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        gregkh <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        y2038 Mailman List <y2038@...ts.linaro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Marcin Juszkiewicz <marcin.juszkiewicz@...aro.org>
Subject: Re: [PATCH v3 7/7] ia64: wire up system calls

On Thu, Oct 11, 2018 at 6:26 AM Firoz Khan <firoz.khan@...aro.org> wrote:
>
> wire up perf_event_open, seccomp, pkey_mprotect, pkey_alloc,
> pkey_free, statx, io_pgetevents and rseq system calls
>
> This require an architecture specific implementation as it not
> present now.
>
> Signed-off-by: Firoz Khan <firoz.khan@...aro.org>
> ---
>  arch/ia64/kernel/syscalls/syscall.tbl | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
>
> diff --git a/arch/ia64/kernel/syscalls/syscall.tbl b/arch/ia64/kernel/syscalls/syscall.tbl
> index 6b64f60..1f42b60 100644
> --- a/arch/ia64/kernel/syscalls/syscall.tbl
> +++ b/arch/ia64/kernel/syscalls/syscall.tbl
> @@ -335,3 +335,19 @@
>  323     common  copy_file_range                 sys_copy_file_range
>  324     common  preadv2                         sys_preadv2
>  325     common  pwritev2                        sys_pwritev2
> +# perf_event_open requires an architecture specific implementation
> +326    common  perf_event_open                 sys_perf_event_open
> +# seccomp requires an architecture specific implementation
> +327    common  seccomp                         sys_seccomp

I don't think that's correct for these two. perf_event_open() of
course requires 'perf' support that ia64 does not have, but
at least seccomp should just work.

> +# pkey_mprotect requires an architecture specific implementation
> +328    common  pkey_mprotect                   sys_pkey_mprotect
> +# pkey_alloc requires an architecture specific implementation
> +329    common  pkey_alloc                      sys_pkey_alloc
> +# pkey_free requires an architecture specific implementation
> +330    common  pkey_free                       sys_pkey_free

One comment for all pkey calls would be sufficient. More importantly
it requires hardware support that ia64 does not have AFAICT.

> +# statx requires an architecture specific implementation
> +331    common  statx                           sys_statx
> +# io_pgetevents requires an architecture specific implementation
> +332    common  io_pgetevents                   sys_io_pgetevents

It certainly does not require any support from the architecture for these.

> +# rseq requires an architecture specific implementation
> +333    common  rseq                            sys_rseq

Maybe leave rseq and pkey_* commented out so we reserve
the number but don't add it for real? Maybe the ia64 maintainers
have a preference.

As asm-generic maintainer, I'd like to have the various asm/unistd.h
headers be as similar as possible and at least reserve all the
numbers even if we don't need the calls on a given architecture.

       Arnd