Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

It has been observed on the mailing lists that the different categories
of pages don't sum to anywhere near the total number of pages on amd64.
This is for the most part because uma_small_alloc() pages have never been
counted as wired pages, like their kmem_malloc() brethren. They should
be. This changes fixes that.

It is no longer necessary for the page queues lock to be held to free
pages allocated by uma_small_alloc(). I removed the acquisition and
release of the page queues lock from uma_small_free() on amd64 and ia64
weeks ago. This patch updates the other architectures that have
uma_small_alloc() and uma_small_free().

Approved by: re (kensmith)

Eliminate some acquisitions and releases of the page queues lock that are
no longer necessary.

/* -> /*- for copyright notices, minor format tweaks as necessary

Move uma_small_alloc() and uma_small_free() to uma_machdep.c. These
functions reference UMA internals from <vm/uma_int.h>, which makes
them highly unwanted in non-UMA specific files.

While here, prune the includes in pmap.c and use __FBSDID(). Move
the includes above the descriptive comment.

The copyright of uma_machdep.c is assigned to the project and can
be reassigned to the foundation if and when when such is preferrable.