linux-kernel - Re: [patch -mm 2/4] mqueue namespace : add unshare support

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Message-Id: <20071129025246.a0d03eef.akpm@linux-foundation.org>
Date:	Thu, 29 Nov 2007 02:52:46 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Cedric Le Goater <clg@...ibm.com>
Cc:	Pavel Emelyanov <xemul@...nvz.org>,
	Linux Containers <containers@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [patch -mm 2/4] mqueue namespace : add unshare support

On Thu, 29 Nov 2007 11:28:28 +0100 Cedric Le Goater <clg@...ibm.com> wrote:

> >> Index: 2.6.24-rc3-mm2/include/linux/sched.h
> >> ===================================================================
> >> --- 2.6.24-rc3-mm2.orig/include/linux/sched.h
> >> +++ 2.6.24-rc3-mm2/include/linux/sched.h
> >> @@ -27,6 +27,7 @@
> >>  #define CLONE_NEWUSER		0x10000000	/* New user namespace */
> >>  #define CLONE_NEWPID		0x20000000	/* New pid namespace */
> >>  #define CLONE_NEWNET		0x40000000	/* New network namespace */
> >> +#define CLONE_NEWMQ		0x80000000	/* New posix mqueue namespace */
> > 
> > That's it :) We've run out of clone flags on 32-bit platforms :(
> 
> yes. 
> 
> I have been giving some thoughts to a clone2() to extend the flags

There appears to be little alternative.

> but
> andrew is preparing to recycle CLONE_DETACHED and CLONE_STOPPED for
> 2.6.26. Some we might have some more time in front of us.

CLONE_DETACHED proved to be in use.  There are no reports of anyone using
CLONE_STOPPED though.

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