[Announce] kdb v1.4 is available

[Keith Owens]

http://oss.sgi.com/projects/kdb/download/ix86/ contains patches for kdb
v1.4 against kernels 2.4.0-test5 (for the SGI XFS beta) and against
2.4.0-test8.  The patch mainly adds one function that the XFS team
wanted.

CONFIG_KDB_OFF.  Default is N, i.e. kdb defaults to on.  The double
negative is messy but necessary for backward compatibility, new config
options default to N.  If you want to ship a kernel with kdb support
but you do not want every oops to drop the kernel into kdb and stop for
debugging then compile with CONFIG_KDB_OFF=y.  Give the users
instructions on how to activate and use kdb when it is needed.

The patch adds the boot time flags, kdb=on, kdb=off, kdb=early.  kdb on
its own still means early but is deprecated.  These flags control the
boot up state of kdb, if not specified then the initial state is taken
from CONFIG_KDB_OFF.

After /proc has been mounted, root can
  echo "1" > /proc/sys/kernel/kdb
to turn kdb on, or
  echo "0" > /proc/sys/kernel/kdb
to turn kdb off.

New environment variable BTAPROMPT.  If not defined or set to non-zero
then bta pauses after each process.  If set to zero then bta does not
pause after each process.  The commands

  set LINES=0
  set BTAPROMPT=0
  bta

list every proc without human intervention.

Assorted man page updates.