malloc(9) -> kmem(9)

Rename of_match_compat_data() to of_compatible_match(). Similarly,
rename of_search_compatible() to of_compatible_lookup().

Standardize on of_compatible_match() for driver matching, and adapt
all call sites.

Use DEVICE_COMPAT_EOL.

Since we're using designated initialisers for compat data, we should
use a completely empty initializer for the sentinel.

Use device_compatible_entry / of_search_compatible() for the child
nodes rather than using of_compatible() to match against different
sets of compatible strings.

branches: 1.15.106;
Split device_t and softc for pckbc(4) and its attachments.

branches: 1.14.2; 1.14.6;
Start detangling lock.h from intr.h. This is likely to cause short term
breakage, but the mess of dependencies has been regularly breaking the
build recently anyhow.

branches: 1.13.2; 1.13.8;
machine/{bus,cpu,intr}.h -> sys/{bus,cpu,intr}.h

branches: 1.12.6; 1.12.8; 1.12.12;
Merge some of the less invasive changes from the vmlocking branch:

- kthread, callout, devsw API changes
- select()/poll() improvements
- miscellaneous MT safety improvements

branches: 1.11.18; 1.11.20;
Use device_private().

branches: 1.10.4; 1.10.6; 1.10.8; 1.10.10; 1.10.12;
merge ktrace-lwp.

branches: 1.9.4;
nuke trailing whitespace

branches: 1.8.8; 1.8.10;
remove license clauses 3 and 4 from my cpoyright notices

branches: 1.7.6;
Add trailing ; to CFATTACH_DECL.

Use CFATTACH_DECL().

Declare all cfattach structures const.

constify and make auto const variables static.

branches: 1.3.8;
Call malloc(9) with M_ZERO flag instead of bzero() after malloc().

add RCSIDs

branches: 1.1.2; 1.1.4; 1.1.6;
Add pckbc attachment so we can get wscons on the dnard.