subr_unit.c: another attempt to fix the build

Reported by: cy
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

kern/subr_unit.c: fix non-debug build

Sponsored by: The FreeBSD Foundation
MFC after: 1 week

sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

unr(9) iterator: add naive test

To use, compile userspace code e.g. into the subr_unit binary, then do
$ while ./subr_unit -iv >|/tmp/subr_unit.log ; do :; done
The loop should be left run for as l

unr(9) iterator: add naive test

To use, compile userspace code e.g. into the subr_unit binary, then do
$ while ./subr_unit -iv >|/tmp/subr_unit.log ; do :; done
The loop should be left run for as long as possible.

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D40089

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unr(9): add 'show unrhdr_iter' command

Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D40089

unr(9): add iterator interface

Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D40089

unr(9): add 'show unrhdr' ddb command

Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D40089

subr_unit.c: explain first/last special ranges

Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D40089

kern/subr_unit.c: more uses for is_bitmap()

To facilitate it, move the is_bitmap() definition earlier.

Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Diffe

kern/subr_unit.c: more uses for is_bitmap()

To facilitate it, move the is_bitmap() definition earlier.

Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D40089

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kern/subr_unit.c: some style

Use NBBY instead of spelling '8' literally.
Put space into the type specifier.

Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

kern/subr_unit.c: some style

Use NBBY instead of spelling '8' literally.
Put space into the type specifier.

Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D40089

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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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unr: remove UNR64_LOCKED

All platforms support 64-bit atomics now.

subr_unit.c: make userspace tests buildable

by defining a placeholder for UNR_NO_MTX

Sponsored by: The FreeBSD Foundation
MFC after: 1 week

unr(9): allow to avoid internal locking

Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D35014

init_unrhdr(): make it usable by initializing everything

Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D

init_unrhdr(): make it usable by initializing everything

Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D35014

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kern: clean up empty lines in .c and .h files

Merge ^/head r357270 through r357349.

Remove duplicated empty lines from kern/*.c

No functional changes.

kern/subr_unit: Rip srandomdev, random(3) out of dead code

The simulation cannot be reproduced, so the value of using a deterministic PRNG
like random(3) is dubious. The number of repitions used in

kern/subr_unit: Rip srandomdev, random(3) out of dead code

The simulation cannot be reproduced, so the value of using a deterministic PRNG
like random(3) is dubious. The number of repitions used in the sample isn't a
problem for the Chacha implementation of arc4random we have today. (Also, no
one actually runs this code; it was provided as an example of the work the
author did validating the implementation. It's not even test code.)

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Merge ^/head r340427 through r340868.

Implement unr64

Important users of unr like tmpfs or pipes can get away with just
ever-increasing counters, making the overhead of managing the state
for 32 bit counters a pessimization.

Change it

Implement unr64

Important users of unr like tmpfs or pipes can get away with just
ever-increasing counters, making the overhead of managing the state
for 32 bit counters a pessimization.

Change it to an atomic variable. This can be further sped up by making
the counts variable "allocate" ranges and store them per-cpu.

Reviewed by: kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D18054

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sys/kern: adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone

sys/kern: adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

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Merge ^/head r323559 through r325504.

MFhead@r324837

While here, diff reduce some of the changes in sys/boot by moving
MK_COVERAGE=no to sys/boot/Makefile.inc .

Properly reset the fields in clean_unrhdr.

In r324542 I neglected to reset the first and last fields of struct
unrhdr. This causes a tmpfs to fail the unr(9) consistency checks with
DIAGNOSTIC on. F

Properly reset the fields in clean_unrhdr.

In r324542 I neglected to reset the first and last fields of struct
unrhdr. This causes a tmpfs to fail the unr(9) consistency checks with
DIAGNOSTIC on. Fix this by resetting the fields by calling init_unrhdr.
While here, change a loop to use TAILQ_FOREACH_SAFE since it is more
readable and equally fast.

Reported by: David Wolfskill <david@catwhisker.org>
Approved by: rstone (mentor)
Sponsored by: Dell EMC Isilon

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