[PATCH] Enhance checkpoint/restart Kconfig options

[Oren Laadan]

Dave Hansen wrote:
> On Thu, 2009-06-04 at 15:01 -0500, Nathan Lynch wrote:
>> Dave Hansen <dave at linux.vnet.ibm.com> writes:
>>> diff -puN checkpoint/Kconfig~cr-kconfig-fixup checkpoint/Kconfig
>>> --- linux-2.6.git/checkpoint/Kconfig~cr-kconfig-fixup	2009-06-04 11:38:57.000000000 -0700
>>> +++ linux-2.6.git-dave/checkpoint/Kconfig	2009-06-04 11:38:57.000000000 -0700
>>> @@ -7,9 +7,14 @@ config DEFERQUEUE
>>>  	default n
>>>  
>>>  config CHECKPOINT
>>> -	bool "Enable checkpoint/restart (EXPERIMENTAL)"
>>> +	bool "Checkpoint/restart (EXPERIMENTAL)"
>>>  	depends on CHECKPOINT_SUPPORT && EXPERIMENTAL
>>>  	select DEFERQUEUE
>>> +	select UTS_NS
>>> +	select IPC_NS
>>> +	select NET_NS
>>> +	select PID_NS
>>> +	select USER_NS
>> *_NS all depend on NAMESPACES at the very least; some have additional
>> dependencies.  Selecting a symbol without ensuring its dependencies are
>> enabled is one way to break a build.
> 
> Ahh, but there *isn't* a strict build dependency on them.  We just want
> to make sure that if they're available that we enable them.  If we have
> CONFIG_NET=n, then we certainly don't want to make CHECKPOINT depends on
> it.  
> 
>> Also - checkpoint is useful without *_NS, no?  Forcing these things on
>> seems a little user-hostile..

I concur.

> 
> I think the hostile thing is trying to completely unshare all the
> namespaces without checking to see which ones are enabled, first. ;)

I concur again :o

Will fix that.

Oren.