Vendor import of Bind 9.8.4-P2

Approved by:	delphij (mentor)
Sponsored by:	DK Hostmaster A/S
Vendor import of Bind 9.8.5-P1

Approved by:	delphij (mentor)
Sponsored by:	DK Hostmaster A/S
Vendor import of BIND 9.8.5-P2

Approved by:	delphij (mentor, implicit)
Sponsored by:	DK Hostmaster A/S
Fix implicit declaration of warnx().
Revert mdmemattr consolidation. It is a bit too shady concept and we
are not so much space constrained in the end.
Use however a __pad0 member to show where some available padding
can be stolen to help reusability.

Sponsored by:	EMC / Isilon storage division
Requested by:	alc
Regen for if_rsu.
Fixing a typo.

Approved by:	sbruno (mentor, implicit)
Remove inclusion of <sys/diskmbr.h>. We have no business knowing
anything related to MBR in this file.
The page hold mechanism is fast but it has couple of fallouts:
- It does not let pages respect the LRU policy
- It bloats the active/inactive queues of few pages

Try to avoid it as much as possible with the long-term target to
completely remove it.
Use the soft-busy mechanism to protect page content accesses during
short-term operations (like uiomove_fromphys()).

After this change only vm_fault_quick_hold_pages() is still using the
hold mechanism for page content access.
There is an additional complexity there as the quick path cannot
immediately access the page object to busy the page and the slow path
cannot however busy more than one page a time (to avoid deadlocks).

Fixing such primitive can bring to complete removal of the page hold
mechanism.

Sponsored by:	EMC / Isilon storage division
Discussed with:	alc
Reviewed by:	jeff
Tested by:	pho
Remove unused member.

Sponsored by:	EMC / Isilon storage division
Reviewed by:	alc
Tested by:	pho
MFC
MFC
 - Introduce a specific function, pmap_remove_kernel_pde, for removing
   huge pages in the kernel's address space.  This works around several
   asserts from pmap_demote_pde_locked that did not apply and gave false
   warnings.

Discovered by:	pho
Reviewed by:	alc
Sponsored by:	EMC / Isilon Storage Division
Fix a panic in tmpaddrtimer.
Rename the busy interface into a shared/exclusive mechanism and shorten
the names.
This makes the interface clearer on the purpose it serves.

Sponsored by:	EMC / Isilon storage division
Requested by:	jeff
Revert r253939:
We cannot busy a page before doing pagefaults.
Infact, it can deadlock against vnode lock, as it tries to vget().
Other functions, right now, have an opposite lock ordering, like
vm_object_sync(), which acquires the vnode lock first and then
sleeps on the busy mechanism.

Before this patch is reinserted we need to break this ordering.

Sponsored by:	EMC / Isilon storage division
Reported by:	kib
MFC
MFC
Redirect svnversion stderr to /dev/null if we cannot determine
the tree version, for example if the tree is checked out with an
outdated svn from ports, but the base system svnlite is built.

Approved by:	kib (mentor)
Note NULL encryption method for GELI

PR:		docs/180551
Submitted by:	r4721@tormail.org
Approved by:	gjb (mentor)