Existing netlink kernel <--> kernel communication

[Luis R. Rodriguez]

Was curious if there are existing use cases of netlink for kernel <-->
kernel communication rather than the typical kernel <--> userspace.
The original RFC 3549 [1] does specify it could have been used for
"intra-kernel messaging", but am just not aware of existing use cases.
A pointer could help.

[1] http://www.faqs.org/rfcs/rfc3549.html

  Luis
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