TAKE - allow pagebuf to build as a module again

[Steve Lord <lord@xxxxxxx>]

Modid:  2.3.99pre2-xfs:slinx:60088a
Date:  Fri Apr 28 11:49:01 PDT 2000
Workarea:  clink.americas.sgi.com:/data/clink/io/lord/xfs-linux

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

linux/fs/page_buf.c - 1.82
http://oss.sgi.com/cgi-bin/cvsweb.cgi/linux-2.4-xfs/linux/fs/page_buf.c.diff?r1=text&tr1=1.82&r2=text&tr2=1.81&f=h
        - Move symbols used by rest of kernel out to rest of kernel, a couple of
          minor tweaks to pagebufs.

linux/include/linux/mm.h - 1.30
http://oss.sgi.com/cgi-bin/cvsweb.cgi/linux-2.4-xfs/linux/include/linux/mm.h.diff?r1=text&tr1=1.30&r2=text&tr2=1.29&f=h
        - Declarations for pb_delalloc_pages and pcd_waitq

linux/kernel/ksyms.c - 1.41
http://oss.sgi.com/cgi-bin/cvsweb.cgi/linux-2.4-xfs/linux/kernel/ksyms.c.diff?r1=text&tr1=1.41&r2=text&tr2=1.40&f=h
        - export pb_delalloc_pages and pcd_waitq to modules

linux/mm/filemap.c - 1.36
http://oss.sgi.com/cgi-bin/cvsweb.cgi/linux-2.4-xfs/linux/mm/filemap.c.diff?r1=text&tr1=1.36&r2=text&tr2=1.35&f=h
        - Declare pb_delalloc_pages and pcd_waitq here