[openib-general] backwards compatibility

[Michael S. Tsirkin]

Hi!
I'm reading a thread on lkml about backwards compatibility
http://lkml.org/lkml/2005/12/29/204
and I wander whether we should work harder on supporting
older userspace library ABIs in kernel?
Currently, we only implement backwards compatibility in user-space,
so that you always have to upgrade userspace when upgrading the kernel,
but we could do this in kernel, too.

We would just need the kernel to return a pair of ABI revision numbers:
minimal and maximal ABI supported.

What do you guys think?

-- 
MST