[Devel] Re: [RFC][v7][PATCH 8/9]: Define clone2() syscall

[Linus Torvalds]

On Wed, 30 Sep 2009, Arnd Bergmann wrote:
> 
> One more argument for this is that the new code is architecture independent
> using user_stack_pointer(), while the original sys_clone is highly
> architecture specific, which is a source for bugs when trying to
> extend it.

Umm. I don't think that is possible.

You need architecture-specific code to even get access to all registers to 
copy and get a signal-handler-compatible stack frame. See for example 
arch/alpha/kernel/entry.S with the switch-stack thing etc.  I don't think 
there is any way to make that even remotely architecture-neutral.

			Linus
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