> Modified Files:
> 	src/sys/net: if_ether.h if_ethersubr.c
> 
> Log Message:
> Add media-handling code for several ethernet drivers with MII buses
> to share.

This breaks the xen kernels, since they have no mii devices but
have ethernet. (It wouldn't surprise me if there were other
arch-specific devices that had the same property.)

I'd think that these routines would be better suited in, say, 
src/sys/dev/mii/mii.c, since they're mii-specific to begin with.