linux-kernel - Re: [Devel] [PATCH] pidns: Place under CONFIG

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Message-ID: <4725B256.3020807@fr.ibm.com>
Date:	Mon, 29 Oct 2007 11:13:42 +0100
From:	Cedric Le Goater <clg@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Adrian Bunk <bunk@...nel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Kir Kolyshkin <kir@...oft.com>, containers@...ts.osdl.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, kir@...nvz.org
Subject: Re: [Devel] [PATCH] pidns: Place under CONFIG_EXPERIMENTAL (take
 2)

Eric W. Biederman wrote:
> Adrian Bunk <bunk@...nel.org> writes:
> 
>> On Sun, Oct 28, 2007 at 09:12:34AM -0700, Jeremy Fitzhardinge wrote:
>>> Eric W. Biederman wrote:
>>>> Roughly that sounds like CONFIG_EXPERIMENTAL to me.  But I would
>>>> be happy to hear if someone has a better idea.
>>> Rather than overload an existing config option, why not add one with the
>>> specific semantics you want: CONFIG_UNSTABLE_UABI.  The problem seems
>>> like one which which may occur again, though one hopes not too often.  I
>>> guess the risk is that people will leave their subsystems depending on
>>> it permanently (sysfs?), so it ends up being set all the time and
>>> becomes as useless as EXPERIMENTAL...
>> Then let SYSFS depend on UNSTABLE_UABI for the next 10 years and we have 
>> an excuse for breaking the ABI with each new kernel...
>>
>> Either the ABI is stable or it should not be exposed to users at all.
> 
> If we need a new config for it.  CONFIG_IMMATURE is the closest I
> can think of.

Pavel also has a CONFIG_NAMESPACES patch that he should be resending to 
andrew when 2.6.24-rc1-mm1 is released. pidns will go under this option, 
like all the other namespaces, and should protect the distros from shipping 
any immature namespace.


C.
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