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

Michael Ellerman mpe at ellerman.id.au
Fri Jul 19 20:18:02 AEST 2019

Christian Brauner <christian at 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();
		*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! :)


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