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Reduce chance of RCU deadlock in the LinuxKPI by implementing the section

Description

Reduce chance of RCU deadlock in the LinuxKPI by implementing the section
feature of the concurrency kit, CK.

Differential Revision: https://reviews.freebsd.org/D29467
Reviewed by: kib@ and markj@
Sponsored by: Mellanox Technologies // NVIDIA Networking

(cherry picked from commit 177772088060ab0f41bcdbdd81c4712e7f1c7621)