Copy stable/11@r303970 to releng/11.0 as part of the 11.0-RELEASE
cycle.

Prune svn:mergeinfo from the new branch, and rename it to RC1.

Update __FreeBSD_version.

Use the quarterly branch for the default FreeBSD.conf pkg(8) repo and
the dvd1.iso packages population.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Since r202933, kthread_suspend_check() takes no arguments. Update the
example to match.

MFC after: 3 days

Remove trailing whitespace per mdoc lint warning

Disussed with: gavin
No objection from: doc
Approved by: joel
MFC after: 3 days

- Fix the kthread_{suspend, resume, suspend_check}() locking.
In the current code, the locking is completely broken and may lead
easilly to deadlocks. Fix it by using the proc_mtx, linked to the
suspending thread, as lock for the operation. Keep using the
thread_lock for setting and reading the flag even if it is not entirely
necessary (atomic ops may do it as well, but this way the code is more
readable).
- Fix a deadlock within kthread_suspend().
The suspender should not sleep on a different channel wrt the suspended
thread, or, otherwise, the awaker should wakeup both. Uniform the
interface to what the kproc_* counterparts do (sleeping on the same
channel).
- Change the kthread_suspend_check() prototype.
kthread_suspend_check() always assumes curthread and must only refer to
it, so skip the thread pointer as it may be easilly mistaken.
If curthread is not a kthread, the system will panic.

In collabouration with: jhb
Tested by: Giovanni Trematerra
<giovanni dot trematerra at gmail dot com>
MFC: 2 weeks

Add claraifications to the kproc and kthread manpages and link
the kthread_create(9) man page to the kproc(9) page as it had migrated and
people looking for it may need a hand to find its new name.

MFC after: 1 week

Add ENOMEM to the return values.
Remove invalid return values.
Remove reference to non-existent manual pages.
Remove reference to rfork (it does not discuss RFSTOPPED).
Add sys/unistd.h to the list of includes (required for RFSTOPPED).

PR: 126227
Submitted by: Mateusz Guzik <mjguzik@gmail.com> (based on, original version)
Reviewed by: jhb, Christoph Mallon <christoph.mallon@gmx.de>

Document the kproc_kthread_add() call
and fix a small detail of its implementation.
MFC after: 1 week

Doc police fixes

thanks to: ru@

catch up with the code.

Note the temporary removal of these functions.

Assorted markup fixes and minor wordsmithing.

Approved by: re

Document that kthread_exit()ing will cause a wakeup(9) on the thread
handle.

MFC after: 1 week

Update the documentation for kthread_create to include the pages argument.

Reviewed by: sheldonh
Forgotten by: scottl

de-__P()

ispell sweep of share/man/man9/*.

mdoc(7) police: Use the new .In macro for #include statements.

mdoc(7) police: remove extraneous .Pp before and/or after .Sh.

mdoc(7) police: sort SEE ALSO xrefs (sort -b -f +2 -3 +1 -2).

- Add 2001 to copyright.
- Kthread functions return an error status, they don't set errno to an
error status.
- Remove the BUGS section as all the bugs listed have been fixed now.

Prepare for mdoc(7)NG.

Catch up to the changes to the kthread API.

Beef up the description of the kernel thread API.

Reviewed by: sheldonh, jasone

Typo fix.

Add some very crude man pages to try to induce folk to work on them.

Agreed to work on them: jasone