- Create kern.ipc.sendfile namespace, and put the new "readhead" OID
  there as "kern.ipc.sendfile.readahead".
- Push all nsfbuf related tunables into MD code. Don't move them
  to new namespace in favor of POLA.

Reviewed by:	scottl
Approved by:	re (gjb)
Consistently use the same value to indicate exclusively-held and
shared-held locks for all the primitives in lc_lock/lc_unlock routines.
This fixes the problems introduced in r255747, which indeed introduced an
inversion in the logic.

Reported by:	many
Tested by:	bdrewery, pho, lme, Adam McDougall, O. Hartmann
Approved by:	re (glebius)
Update comment from draft to RFC number.

Submitted by:	Loganaden Velvindron (logan elandsys.com)
Approved by:	re (gjb)
MFC after:	6 days
Both the vm_map and vmspace zones are defined as "no free".  So, there is no
point in defining a fini function for these zones.

Reviewed by:	kib
Approved by:	re (glebius)
Sponsored by:	EMC / Isilon Storage Division
Fix indentation.

Approved by:	re (blanket)
Due to a missing command-line argument, yacc regenerated the parser but
not its header file, resulting in a mismatch between the lexer and parser
and strange errors when reading the configuration file.

Approved by:	re (blanket)
Launch the shell, passing it the path to the mk-osreldate script, rather
than launching the script directly and relying on #! to launch the shell.
This avoids problems when the source is mounted with the noexec flag.

MFC this together with r255775.

Approved by:	re (kib)
MFC after:	2 weeks
Increase the chance of the buffer write from the bufdaemon helper
context to succeed.  If the locked vnode which owns the buffer to be
written is shared locked, try the non-blocking upgrade of the lock to
exclusive.

PR:	kern/178997
Reported and tested by:	Klaus Weber <fbsd-bugs-2013-1@unix-admin.de>
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Approved by:	re (marius)
Pre-acquire the filedesc sx when a possibility exists that the later
code could need to remove a kqueue from the filedesc list.  Global
lock is already locked, which causes sleepable after non-sleepable
lock acquisition.

Reported and tested by:	pho
Reviewed by:	jmg
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
Approved by:	re (gjb)
Revert r255797.  The LK_UPGRADE | LK_NOWAIT drops the lock.

Approved by:	re (marius, implicit)
Build and install drill(1).

Approved by:	re (blanket)
Remove drill(1) if MK_LDNS_UTILS is false.
Remove host(1) if both MK_BIND and MK_LDNS_UTILS are false.

Approved by:	re (blanket)
Pull in r191165 from upstream llvm trunk:

  ISelDAG: spot chain cycles involving MachineNodes

  Previously, the DAGISel function WalkChainUsers was spotting that it
  had entered already-selected territory by whether a node was a
  MachineNode (amongst other things). Since it's fairly common practice
  to insert MachineNodes during ISelLowering, this was not the correct
  check.

  Looking around, it seems that other nodes get their NodeId set to -1
  upon selection, so this makes sure the same thing happens to all
  MachineNodes and uses that characteristic to determine whether we
  should stop looking for a loop during selection.

  This should fix PR15840.

Specifically, this fixes the long-standing assertion failure when
compiling the multimedia/gstreamer port on i386.  Thanks to Tijl
Coosemans for his help in getting upstream to fix it.

Approved by:	re (marius)
Always request zeroed memory, in case we're dumb enough to leak it later.

Approved by:	re (gjb)
Export two new DCMD enums.  These allow set/get of the mfi_ctrl_properties
structure in the driver.

Having these in 10.0 means that mfiutil can be modified to take adavantage
of new updates without a kernel recompile.

Approved by:	re (gjb)
MFC after:	2 weeks
Launch the bourne shell using "sh" rather than "${SHELL}", as the latter
may come in from the environment and reflect the user's interactive shell.
Using bare "sh" is the dominant pattern in existing makefiles.

MFC this together with r255775.

Approved by:	re ()
MFC after:	2 weeks
Add a setup script for unbound(8) called local-unbound-setup.  It
generates a configuration suitable for running unbound as a caching
forwarding resolver, and configures resolvconf(8) to update unbound's
list of forwarders in addition to /etc/resolv.conf.  The initial list
is taken from the existing resolv.conf, which is rewritten to point to
localhost.  Alternatively, a list of forwarders can be provided on the
command line.

To assist this script, add an rc.subr command called "enabled" which
does nothing except return 0 if the service is enabled and 1 if it is
not, without going through the usual checks.  We should consider doing
the same for "status", which is currently pointless.

Add an rc script for unbound, called local_unbound.  If there is no
configuration file, the rc script runs local-unbound-setup to generate
one.

Note that these scripts place the unbound configuration files in
/var/unbound rather than /etc/unbound.  This is necessary so that
unbound can reload its configuration while chrooted.  We should
probably provide symlinks in /etc.

Approved by:	re (blanket)
Prevent "lock (iscsi) sx does not match earlier (sleep mutex) lock" panic
triggered by "kldload iscsi_initiator; kldunload iscsi_initiator; kldload
iscsi".

Approved by:	re (marius)
Import a new libcxxrt.  This fixes some potential crashing in the demangler.

Approved by:	re (gjb)
MFC after:	1 week
Fix DELAY() on RPi, the wrong math was making it take twice it should.

Reported by:	Alexander <sht@ropnet.ru>
Approved by:	adrian (mentor)
Approved by:	re (gjb)