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Create devctl freeze/thaw.

Description

Create devctl freeze/thaw.

This adds it to devctl, libdevctl, defines the two IOCTLs and
implements the kernel bits. causes any new drivers that are added via
kldload to be deferred until a 'thaw' comes in. These do not stack: it
is an error to freeze while frozen, or thaw while thawed.

Differential Revision: https://reviews.freebsd.org/D16735

Details

Provenance
impAuthored on Aug 23 2018, 5:05 AM
Parents
rG67b60a1b7d46: dtc(1): Update to 0892ec7; HACKING and implicit header fixes
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