Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Document crcopysafe() and crsetgroups().

Reminded by: julian

Remove the suser(9) interface from the kernel. It has been replaced from
years by the priv_check(9) interface and just very few places are left.
Note that compatibility stub with older FreeBSD version
(all above the 8 limit though) are left in order to reduce diffs against
old versions. It is responsibility of the maintainers for any module, if
they think it is the case, to axe out such cases.

This patch breaks KPI so __FreeBSD_version will be bumped into a later
commit.

This patch needs to be credited 50-50 with rwatson@ as he found time to
explain me how the priv_check() works in detail and to review patches.

Tested by: Giovanni Trematerra <giovanni dot trematerra at gmail dot com>
Reviewed by: rwatson

Use 'manual page' instead of 'man page' for consistency.

Approved by: re (hrs)

mdoc(7) police: typos.

Update ucred.9 to talk a bit more about correct use of credentials,
including documenting that ucreds must not be pulled out of thin air,
when to use td_cred vs. p_ucred, how to avoid race conditions in
credential updates, and why to use p_ucred when targetting a thread
or process in an access control operation involving two processes.

Reviewed by: julian, jhb (earlier revision)

Slight changes to reflect some of the changes in -current.
mi_switch(9) is still wildly innacurate. I suggest that every kernel
developer takes 20 minutes a day for the next few days and updates one or
two of his favourite chapter 9 man pages as they are now WAY out of date
in general. I will add a couple of KSE related pages soon.

Document the cred_update_thread() function, and fix the RETURN VALUES.

Document cru2x().

Update function definitions and required include files to reflect
the current state of the system.

Approved by: alfred

Bring the ucred(9) manpage in sync with the source.

Specifically, document the crshared() function and
fix the prototype and description of the crcopy()
function.

PR: docs/32275
Submitted by: Chad David <davidc@acns.ab.ca>
Reviewed by: jhb

Add a few more manpages from Chad.
Fold major.9, minor.9, umajor.9, and uminor.9 into a single device_ids.9.