kernfs from Xen code

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

Hello,
I've been told that MODULAR kernels don't builds any more, because
Xen code (which is built by default) registers kernfs nodes.

Xen domU can work without kernfs; the kernfs node (/kern/xen/xenbus) allows
to use xenstore tools from the domU.

I don't see a compile-time option to detect if kernfs is being compiled in.

I see the following options:
- declare that KERNFS is mandatory if you compile Xen in.
- Add a needs-flag to kenrfs, so Xen can omit its kernfs code when
  compiled without kernfs. 
- move Xen's kernfs code to kernfs; this would need some stub functions
  when Xen is not compiled in.

And maybe more I didn't think about.

For me the second option would be best; I can live with the first one too.
The third is ugly.

Any idea/comment ?


-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--