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

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Date:   Fri, 19 Jul 2019 12:25:04 +0200
From:   Christian Brauner <christian@...uner.io>
To:     Michael Ellerman <mpe@...erman.id.au>
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>
Subject: Re: [PATCH 1/2] arch: mark syscall number 435 reserved for clone3

On Fri, Jul 19, 2019 at 08:18:02PM +1000, Michael Ellerman wrote:
> Christian Brauner <christian@...uner.io> writes:
> > 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:
> 
> Hi Christian,
> 
> Thanks for the test.
> 
> This actually oopses on powerpc, it hits the BUG_ON in CHECK_FULL_REGS
> in process.c around line 1633:
> 
> 	} else {
> 		/* user thread */
> 		struct pt_regs *regs = current_pt_regs();
> 		CHECK_FULL_REGS(regs);
> 		*childregs = *regs;
> 		if (usp)
> 
> 
> So I'll have to dig into how we fix that before we wire up clone3.
> 
> Turns out testing is good! :)

Indeed. I have a test-suite for clone3 in mind and I hope to have it
ready by the end of next week. It's just always the finding the time
part that is annoying. :)

Thanks for digging into this, Michael!
Christian