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

[Michael Ellerman]

Christian Brauner <christ...@brauner.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! :)

cheers