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

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Message-ID: <4AC255A4.4030002@zytor.com>
Date:	Tue, 29 Sep 2009 11:44:52 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Roland McGrath <roland@...hat.com>
CC:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Arnd Bergmann <arnd@...db.de>,
	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,
	torvalds@...ux-foundation.org,
	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 09/29/2009 11:40 AM, Roland McGrath wrote:
> Why add a new syscall at all instead of just using a new CLONE_* flag to
> indicate that the argument layout is different?

What an absolutely atrociously bad idea.

We already have a syscall layer which is painful to thunk in places, and
this would make it much worse.

	-hpa

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