[Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config options and disable unsupported config options.

[Dan Hecht <dhecht@xxxxxxxxxx>]

On 02/13/2007 03:29 PM, Jeremy Fitzhardinge wrote:
> Dan Hecht wrote:
> > I assume you plan to eventually get all this stuff working but just
> > want to prevent configurations that the Xen paravirt-ops isn't ready
> > for at the moment?
> >
> > Instead can you do it this way:
> >
> > config XEN
> >     depends on PARAVIRT && !PREEMPT && HZ_100 && !DOUBLEFAULT && !KEXEC
> That's a bit simpler code-wise, but it does make it pretty complex to
> get everything just-so to even see the CONFIG_XEN option.
Not only is it simpler code-wise, but it is more to the point... it is 
CONFIG_XEN that needs to be fixed to handle PREEMPT, KEXEC, different HZ 
values, etc.  Not the other way around.
Enabling the compile of any paravirt-ops backend shouldn't cripple the 
kernel in any way... instead, the burden should be on the xen 
paravirt-ops backend to be completed.  CONFIG_PREEMPT shouldn't care 
about which paravirt-ops are compiled in.  Instead, CONFIG_XEN is the 
one that needs !PREEMPT.
Dan

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