2.5.39-bk2 compile failure with CONFIG_XFS_FS=y

[Steven Cole <elenstev@mesatop.com>]

I got the following compile error building 2.5.39-bk2 with CONFIG_XFS_FS=y:

fs/xfs/pagebuf/page_buf.c: In function `pagebuf_queue_task':
fs/xfs/pagebuf/page_buf.c:1164: warning: implicit declaration of function `queue_task'
fs/xfs/pagebuf/page_buf.c: In function `pagebuf_iodone_daemon':
fs/xfs/pagebuf/page_buf.c:1709: warning: implicit declaration of function `TQ_ACTIVE'
fs/xfs/pagebuf/page_buf.c:1714: warning: implicit declaration of function `run_task_queue'
[snip]
fs/built-in.o: In function `pagebuf_queue_task':
fs/built-in.o(.text+0xcdee5): undefined reference to `queue_task'
fs/built-in.o: In function `pagebuf_iodone':
fs/built-in.o(.text+0xcdfb4): undefined reference to `queue_task'
fs/built-in.o: In function `pagebuf_iodone_daemon':
fs/built-in.o(.text+0xcea90): undefined reference to `TQ_ACTIVE'
fs/built-in.o(.text+0xceab6): undefined reference to `run_task_queue'
make: *** [.tmp_vmlinux] Error 1

Without CONFIG_XFS_FS=y or m, 2.5.39-bk2 compiles fine.
Plain vanilla 2.5.39 builds with CONFIG_XFS_FS=m.

Steven