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)

Add parens around *free in *free++ in mbp_count() so that mbp_count()
actually works. mbp_count() turns out only to be used in debugging code
in if_patm_intr.c, so this bug did not affect much in practice.

Found with: Coverity Prevent(tm)
CID: 1943

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

Pass MTX_DEF as the last argument to mtx_init() instead of 0. This
is not a functional change. The code happened to work properly only
because MTX_DEF is defined as 0.

Add a facility for devices, specifically network interfaces, that require
large to huge amounts of small or medium sized receive buffers. The problem
with these situations is that they eat up the available DMA address space
very quickly when using mbufs or even mbuf clusters. Additionally this
facility provides a direct mapping between 32-bit integers and these buffers.
This is needed for devices originally designed for 32-bit systems. Ususally
the virtual address of the buffer is used as a handle to find the buffer as
soon as it is returned by the card. This does not work for 64-bit machines
and hence this mapping is needed.