Jeremy Fitzhardinge wrote:

quoted

  It also has one
negative side-effect, which is promoting external module code that links
with the kernel.  IOW, there's much less incentive to get code merged
if it's just a matter of linking.
    

It wouldn't be something we'd promote by making it easy to bind
out-of-tree code to the interface.  And it would still be a
kernel-version-specific ABI; no guarantees of stability.

BTW, my intention is definitely that all the pv-ops implementations are
linked into the kernel at build time; its just the binding references
get updated at boot time, and the unused code pages can be recycled. 
But they're all part of the same kernel image.

    J