[Devel] Re: [PATCH 1/5] The config option itself

[sukadev at us.ibm.com]

Serge E. Hallyn [serue at us.ibm.com] wrote:
| Quoting Serge E. Hallyn (serue at us.ibm.com):
| > Quoting Pavel Emelyanov (xemul at openvz.org):
| > > The option is called NAMESPACES. It can be selectable only
| > > if EMBEDDED is chosen (this was Eric's requisition). When
| > > the EMBEDDED is off namespaces will be on automatically.
| > > 
| > > One more option (NAMESPACES_EXPERIMENTAL) was added by 
| > > Serge's request to move there all the namespaces that are 
| > > not finished yet. Currently only the user and the network
| > > namespaces are such.
| > > 
| > > Signed-off-by: Pavel Emelyanov <xemul at openvz.org>
| > > 
| > > ---
| > > 
| > > diff --git a/init/Kconfig b/init/Kconfig
| > > index 684ccfb..05a71d7 100644
| > > --- a/init/Kconfig
| > > +++ b/init/Kconfig
| > > @@ -369,6 +360,23 @@ config RELAY
| > > 
| > >  	  If unsure, say N.
| > > 
| > > +config NAMESPACES
| > > +	bool "The namespaces support" if EMBEDDED
| > > +	default !EMBEDDED
| > > +	help
| > > +	  Provides the way to make tasks work with different objects using
| > > +	  the same id. For example same IPC id may refer to different objects
| > > +	  or same user id or pid may refer to different tasks when used in
| > > +	  different namespaces.
| > > +
| > > +config NAMESPACES_EXPERIMENTAL
| > > +	bool "Add the experimantal namespaces support" if EMBEDDED
| > 
| > Hi Pavel,
| > 
| > Overall this patchset looks good.
| > 
| > However the NAMESPACES_EXPERIMENTAL option should not have the
| > 'if EMBEDDED', right?  This is about EXPERIMENTAL, not about
| > EMBEDDED, unlike the plain NAMESPACES option.
| > 
| > -serge
| 
| Actually that doesn't seem to work either.  Even though
| SECURITY_NAMESPACES=y, the config system seems to infer that
| since NAMESPACES is not user-selectable, NAMESPACES_EXPERIMENTAL
| shouldn't be either.  So we end up with NAMESPACES_EXPERIMENTAL
| being on and not un-selectable if !EMBEDDED.

Yes. Given that NAMESPACES depends on EMBEDDED, NAMESPACES_EXPERIMENTAL
can simply depend on NAMESPACES and EXPERIMENTAL with a default of N.

BTW, does the position of 'config NAMESPACES' in init/Kconfig file
matter ?  If it is dependent on EMBEDDED, should it not come later
in the file, after 'config EMBEDDED' ?

| 
| > > +	depends on NAMESPACES && EXPERIMENTAL
| > > +	default !EMBEDDED
| > > +	help
| > > +	  Also include the support for the namespaces that are not fnished
| > > +	  or well developed yet
| > > +
| > >  config BLK_DEV_INITRD
| > >  	bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
| > >  	depends on BROKEN || !FRV
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