It has occured to me that whilst the kernel may change, in subtle ways, it
may change in such a way that an LKM stops working but it will still link
and load into the new kernel.

To me, this seems to be a serious problem.

Any suggestions for people writing LKMs for NetBSD on how to handle this
situation except for a "don't use NetBSD-current with it" type approach ?

Darren

(it's possible that other OS's like Solaris2 could also suffer from the same
 problem of version skew and they too have no solution that I'm aware of).