[Unionfs] How to enable debugging

[Klaus Fuerstberger]

Hi,

I want to enable debugging in unionfs-2.2.4_for_2.6.24.2, but it does 
not work.

CONFIG_UNION_FS=m
CONFIG_UNION_FS_XATTR=y
CONFIG_UNION_FS_DEBUG=y

This is, how I want to enable debug:
mount -t unionfs -o dirs=/tmp/aaa=rw:/tmp/bbb=ro,debug=1 unionfs /tmp/ccc

But I get:
unionfs: unrecognized option 'debug'

~# modinfo unionfs
filename:       /lib/modules/2.6.24.2-alix-i586/kernel/fs/unionfs/unionfs.ko
license:        GPL
description:    Unionfs 2.2.4 (for 2.6.24.2) 
(http://unionfs.filesystems.org)
author:         Erez Zadok, Filesystems and Storage Lab, Stony Brook 
University (http://www.fsl.cs.sunysb.edu)
depends:
vermagic:       2.6.24.2-alix-i586 mod_unload 586

I got a warning when compiling the kernel with enabled debugging. Mabe 
its important:
  CC [M]  fs/unionfs/debug.o
fs/unionfs/debug.c: In function '__unionfs_check_dentry':
fs/unionfs/debug.c:172: warning: passing argument 1 of 'd_deleted' 
discards qualifiers from pointer target type

Thanks!
Klaus