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)

Retire the INTR_FAST flag as it was obsoleted by the introduction of the
filter argument to bus_setup_intr().

- Talk about memory allocation in interrupt context
- Add uam to see also

Submitted by: Devon H. O'Dell <devon.odell@coyotepoint.com>

Fix the NAME section making whatis(1) happy in particular.

Mechanically kill hard sentence breaks and double whitespaces.

mdoc(7): Use the new feature of the .In macro.

Language clarification: s/an or/a/

ispell sweep of share/man/man9/*.

Fixed missing include in synopsis.

mdoc(7) police: Use the new .In macro for #include statements.

can not -> cannot

Removed whitespace at end-of-line; no content changes. I simply did
cd src/share; find man[1-9] -type f|xargs perl -pi -e 's/[ \t]+$//'

BTW, what editors are the culprits? I'm using vim and it shows
me whitespace at EOL in troff files with a thick blue block...

Reviewed by: Silence from cvs diff -b
MFC after: 7 days

mdoc(7) police: mark C types with Vt macro.

Document the ithread_* API used to manage interrupt threads and their
list of handlers.