linux-kernel - Re: [PATCH 3/3] add the clone64() and unshare64() syscalls

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Message-ID: <20080410021523.GB28477@us.ibm.com>
Date:	Wed, 9 Apr 2008 19:15:23 -0700
From:	sukadev@...ibm.com
To:	Jakub Jelinek <jakub@...hat.com>
Cc:	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 3/3] add the clone64() and unshare64() syscalls

Jakub Jelinek [jakub@...hat.com] wrote:
| On Wed, Apr 09, 2008 at 03:34:59PM -0700, sukadev@...ibm.com wrote:
| > From: Cedric Le Goater <clg@...ibm.com>
| > Subject: [PATCH 3/3] add the clone64() and unshare64() syscalls
| > 
| > This patch 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);
| 
| Can you explain why are you adding it for 64-bit arches too?  unsigned long
| is there already 64-bit, and both sys_clone and sys_unshare have unsigned
| long flags, rather than unsigned int.

Hmm,

By simply resuing clone() on 64 bit and adding a new call for 32-bit won't
the semantics of clone() differ between the two ?

i.e clone() on 64 bit supports say CLONE_NEWPTS clone() on 32bit does not ?

Wouldn't it be simpler/cleaner if clone() and clone64() behaved the same
on both 32 and 64 bit systems ?

Sukadev
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