linux-kernel - Re: [PATCH 1/2] arch: mark syscall number 435 reserved for clone3

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Message-ID: <20190716185554.gwpppirvmxgvnkgb@brauner.io>
Date:   Tue, 16 Jul 2019 20:55:55 +0200
From:   Christian Brauner <christian@...uner.io>
To:     Sven Schnelle <svens@...ckframe.org>
Cc:     Christian Borntraeger <borntraeger@...ibm.com>,
        linux-kernel@...r.kernel.org, arnd@...db.de,
        linux-arch@...r.kernel.org, linux-alpha@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>, mpe@...erman.id.au
Subject: Re: [PATCH 1/2] arch: mark syscall number 435 reserved for clone3

On Tue, Jul 16, 2019 at 08:53:10PM +0200, Sven Schnelle wrote:
> Hi,
> 
> [Adding Helge to CC list]
> 
> On Tue, Jul 16, 2019 at 03:06:33PM +0200, Christian Brauner wrote:
> > On Mon, Jul 15, 2019 at 03:56:04PM +0200, Christian Borntraeger wrote:
> > > I think Vasily already has a clone3 patch for s390x with 435. 
> > 
> > A quick follow-up on this. Helge and Michael have asked whether there
> > are any tests for clone3. Yes, there will be and I try to have them
> > ready by the end of the this or next week for review. In the meantime I
> > hope the following minimalistic test program that just verifies very
> > very basic functionality (It's not pretty.) will help you test:
> > [..]
> 
> On PA-RISC this seems to work fine with Helge's patch to wire up the
> clone3 syscall.

I think I already responded to Helge before and yes, I think that parisc
doesn't do anything special for fork, vfork, clone, and by extension
also probably doesn't need to for clone3.
It should only be a problem for arches that require mucking explicitly
with arguments of clone-like syscalls.
In any case, I saw Helge's patch and I think I might've missed to add an
Acked-by but feel free to add it.

Thanks for testing it and sorry that I couldn't test!
Christian