linux-kernel - Re: [PATCH 0/3] clone64() and unshare64() system calls

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Message-ID: <20080410182616.GF28477@us.ibm.com>
Date:	Thu, 10 Apr 2008 11:26:16 -0700
From:	sukadev@...ibm.com
To:	Paul Menage <menage@...gle.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Andrew Morton <akpm@...l.org>,
	clg@...ibm.com, serue@...ibm.com,
	"David C. Hansen" <haveblue@...ibm.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Containers <containers@...ts.osdl.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] clone64() and unshare64() system calls

Paul Menage [menage@...gle.com] wrote:
| On Wed, Apr 9, 2008 at 7:38 PM,  <sukadev@...ibm.com> wrote:
| >
| >  But as Jon Corbet pointed out in the the thread above, it looked like
| >  adding a new system call has been the "traditional" way of solving this
| >  in Linux so far and there has been no consensus on a newer approach.
| >
| 
| I thought that the consensus was that adding a new system call was
| better than trying to force extensibility on to the existing
| non-extensible system call.

There were couple of objections to extensible system calls like
sys_indirect() and to Pavel's approach.

| 
| But if we are adding a new system call, why not make the new one
| extensible to reduce the need for yet another new call in the future?

hypothetically, can we make a variant of clone() extensible to the point
of requiring a copy_from_user() ?

| 
| Paul
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