linux-kernel - Re: [RFC][v7][PATCH 8/9]: Define clone2() syscall

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Message-ID: <alpine.LFD.2.01.0909300925170.6996@localhost.localdomain>
Date:	Wed, 30 Sep 2009 09:27:56 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Arnd Bergmann <arnd@...db.de>
cc:	"H. Peter Anvin" <hpa@...or.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Roland McGrath <roland@...hat.com>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Containers <containers@...ts.linux-foundation.org>,
	Nathan Lynch <nathanl@...tin.ibm.com>,
	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>, mingo@...e.hu,
	Alexey Dobriyan <adobriyan@...il.com>,
	Pavel Emelyanov <xemul@...nvz.org>, linux-api@...r.kernel.org,
	kosaki.motohiro@...fujitsu.com
Subject: Re: [RFC][v7][PATCH 8/9]: Define clone2() syscall



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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