linux-kernel - Re: [patch 0/3] clone64() and unshare64() syscalls

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Date:	Tue, 12 Feb 2008 11:28:49 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	clg@...ibm.com
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	xemul@...nvz.org, serue@...ibm.com
Subject: Re: [patch 0/3] clone64() and unshare64() syscalls

Quoting clg@...ibm.com (clg@...ibm.com):
> yet another try to extend the clone flags and probably not the last !
> 
> This patchset adds 2 new syscalls :
> 
>      long sys_clone64(unsigned long flags_high, unsigned long flags_low,
> 		unsigned long newsp);
> 
>      long sys_unshare64(unsigned long flags_high, unsigned long flags_low);
> 
> The current version of clone64() does not support CLONE_PARENT_SETTID and 
> CLONE_CHILD_CLEARTID because we would exceed the 6 registers limit of some 
> arches. It's possible to get around this limitation but we might not
> need it as we already have clone()
> 
> This is work in progress but already includes support for x86, x86_64, 
> x86_64(32), ppc64, ppc64(32), s390x, s390x(31). 
> 
> ia64 already supports 64bits clone flags through the clone2() syscall.
> should we harmonize the name to clone2 ?  
> 
> 
> Please see the changelog below.

Tested unshare64 with a new namespace using the first clone_hi bit, no
problems here (on a kvm-qemu image).

-serge
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