TAKE - rewrite kdb SMP handling

[kaos@xxxxxxxxxxxxxxxxxxxxxxxx (Keith Owens)]

The kdb SMP handling was convoluted and had no clear distinction between
local (per cpu) and global debugging states.  The logic flow through the
main kdb routine was difficult to follow with multiple return points.  This
is a major rewrite of kdb SMP handling.

Modid:  2.3.99pre2-kdb:slinx:63159a
Date:  Wed May 31 23:57:27 PDT 2000
Workarea:  
moomba.melbourne.sgi.com:/tmp_mnt/hosts/sherman/home/kaos/isms/slinx/slinx_2.3.99pre2-kdb
Author:  kaos

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/slinx/2.3.99pre2-kdb

linux/arch/i386/kdb/kdbasupport.c - 1.9
http://oss.sgi.com/cgi-bin/cvsweb.cgi/linux-2.4-xfs/linux/arch/i386/kdb/kdbasupport.c.diff?r1=text&tr1=1.9&r2=text&tr2=1.8&f=h
linux/arch/i386/kernel/smp.c - 1.20
http://oss.sgi.com/cgi-bin/cvsweb.cgi/linux-2.4-xfs/linux/arch/i386/kernel/smp.c.diff?r1=text&tr1=1.20&r2=text&tr2=1.19&f=h
linux/include/linux/kdb.h - 1.9
http://oss.sgi.com/cgi-bin/cvsweb.cgi/linux-2.4-xfs/linux/include/linux/kdb.h.diff?r1=text&tr1=1.9&r2=text&tr2=1.8&f=h
linux/include/linux/kdbprivate.h - 1.8
http://oss.sgi.com/cgi-bin/cvsweb.cgi/linux-2.4-xfs/linux/include/linux/kdbprivate.h.diff?r1=text&tr1=1.8&r2=text&tr2=1.7&f=h
linux/kdb/kdb_bp.c - 1.8
http://oss.sgi.com/cgi-bin/cvsweb.cgi/linux-2.4-xfs/linux/kdb/kdb_bp.c.diff?r1=text&tr1=1.8&r2=text&tr2=1.7&f=h
linux/kdb/kdbmain.c - 1.11
http://oss.sgi.com/cgi-bin/cvsweb.cgi/linux-2.4-xfs/linux/kdb/kdbmain.c.diff?r1=text&tr1=1.11&r2=text&tr2=1.10&f=h
linux/kdb/kdbsupport.c - 1.8
http://oss.sgi.com/cgi-bin/cvsweb.cgi/linux-2.4-xfs/linux/kdb/kdbsupport.c.diff?r1=text&tr1=1.8&r2=text&tr2=1.7&f=h