NetKGDB support.

[Andrei Warkentin]

This is tentative patch set I am sending for feedback. It
implements a network I/O backend for KDB/KGDB, the kernel
debugger.

Very similar to netconsole, on which it is based, but with
a crucial difference - netkgdb is designed to accept connections
from any hosts, i.e. it is not necessary to specify these ahead
of time. This makes it that much more useful in a "this host crashed
and a I want a developer to take a look at it" scenario, common to
large scale test/QA farms and automated testing harnesses. This
involves a minor change to the netpoll rx_hook, namely, to provide
source connection information.

[PATCH 1/2] NETPOLL: Extend rx_hook support.
[PATCH 2/2] NETKGDB: Ethernet/UDP/IP KDB transport.

Thanks,
A
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