TAKE 901693 - ktrace fixes

[Nathan Scott <nathans@xxxxxxxxxxxxxxxxxxxxxxx>]

Fix ktrace code - dont build unilaterally, and do earlier
initialisation for pagebuf use (later).

Date:  Thu Oct 16 20:29:52 PDT 2003
Workarea:  bruce.melbourne.sgi.com:/build2/clean24

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/slinx/2.4.x-xfs


Modid:  xfs-linux:slinx:160172a
linux/fs/xfs/xfs_vfsops.c - 1.435
linux/fs/xfs/support/Makefile - 1.16
linux/fs/xfs/support/ktrace.c - 1.17
linux/fs/xfs/support/ktrace.h - 1.10
linux/fs/xfs/linux/xfs_super.c - 1.273