> > > > > It is, because pkgsrc softwares are expected to build and run on older
> > > > > systems.
> > > > 
> > > > do you mean, we need to keep xentools in pkgsrc to use old version of
> > > > IOCTL_PRIVCMD_INITDOMAIN_EVTCHN?
> > 
> > can you please answer this question?
> > i want to change pkgsrc to use new version of the ioctl eventually.
> > isn't it acceptable for you?
> 
> This is acceptable, but the kernel needs to be able to handle both for some
> time.  Otherwise we'll have a problem for the upgrade (we need to upgrade both
> the kenrel and tools at once, and this is something we want to avoid if 
> possible)

a question is, how long is "some time".  forever?

> > > Which means that you have to revert the pkgsrc source. not easy if you
> > > don't have CVS access.
> > 
> > well, so what?
> > all userland tools are the same in these respects.
> 
> Not really. Old tools with new kernel usually work.

some system tools don't usually work.
eg. kmem grovellers, ipf/pf utilities, etc.
IMO xentools belong to this kind of tools.

YAMAMOTO Takashi