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Whats so difficult about ISSU

In article <xs4all.m2lie9nhko.wl%randy at psg.com> you write:
>linux has become a fad in the vendor community.  it seems to lend
>legitimacy to their products in some way, witness this discussion.
>but linux has the gpl poison.  so, any code that they wish to keep
>proprietary is in userland.

Which isn't really a problem, none of the control plane stuff needs
to run in the kernel. The only thing that needs to run in the
kernel is the device driver(s) to talk to the forwarding plane
hardware, but if you use ethernet or infiniband for that
communication you don't need any proprietary drivers.