linux-kernel - Re: [PATCH v2 1/2] pid: add pidfd

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Date:   Mon, 20 May 2019 16:59:16 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Christian Brauner <christian@...uner.io>
Cc:     Jann Horn <jannh@...gle.com>, Oleg Nesterov <oleg@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>, cyphar@...har.com,
        David Howells <dhowells@...hat.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        "Reshetova, Elena" <elena.reshetova@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Andy Lutomirski <luto@...capital.net>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        alpha <linux-alpha@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-ia64@...r.kernel.org,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        linux-mips@...r.kernel.org,
        Parisc List <linux-parisc@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        linux-xtensa@...ux-xtensa.org,
        Linux API <linux-api@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Daniel Colascione <dancol@...gle.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [PATCH v2 1/2] pid: add pidfd_open()

On Mon, May 20, 2019 at 4:48 PM Christian Brauner <christian@...uner.io> wrote:
>
> On Mon, May 20, 2019 at 04:37:03PM +0200, Arnd Bergmann wrote:
> > On Mon, May 20, 2019 at 3:46 PM Christian Brauner <christian@...uner.io> wrote:
> > >
> > > In line with Arnd's recent changes to consolidate syscall numbers across
> > > architectures, I have added the pidfd_open() syscall to all architectures
> > > at the same time.
> >
> > Thanks! I've checked that the ones you have added are all
> > done correctly. However, double-checking that you got all of them,
> > I noticed that you missed mips-o32 and mips-n64. With those added:
> >
> > Acked-by: Arnd Bergmann <arnd@...db.de>
>
> Perfect, will plumb mips-o32 and mips-n64 and resend once more with your
> ack added.
> Sidenote: You plan on merging the common syscall tables or will there be
> a script to do this work per-arch in the future?

David Howells also asked about this. I think having a common table will
be best in the long run, patches welcome.

As you noticed, there are still a few minor differences between the files
on mips, arm, x86, alpha and s390, and we are missing the .tbl files
for arm-compat and asm-generic, as well as an architecture independent
script.

Once that is all taken care of, we can move the entries for syscall
403 and higher into a common file, and change the script to pick
up the contents from there in addition to the architecture specific
file.

      Arnd