[2.5.55] unresolved symbols

Hello!

I am wondering how soundcore.ko can contain errno. Is it possible that sound_core.c includes it with linux/errno.h ?
But why does only soundcore.ko has the unknown symbol ?

Greetings,

Nico

p.s.: output of depmod from modules_install:

if [ -r System.map ]; then /sbin/depmod -ae -F System.map 2.5.55; fi
WARNING: /lib/modules/2.5.55/kernel/sound/soundcore.ko needs unknown symbol errno
WARNING: /lib/modules/2.5.55/kernel/drivers/message/i2o/i2o_pci.ko needs unknown symbol i2o_sys_init
WARNING: /lib/modules/2.5.55/kernel/security/root_plug.ko needs unknown symbol usb_bus_list_lock
WARNING: /lib/modules/2.5.55/kernel/security/root_plug.ko needs unknown symbol usb_bus_list
WARNING: /lib/modules/2.5.55/kernel/fs/nfsd/nfsd.ko needs unknown symbol hash_mem
WARNING: /lib/modules/2.5.55/kernel/arch/i386/kernel/microcode.ko needs unknown symbol devfs_set_file_size

Please send your messages pgp-signed and/or pgp-encrypted (don't encrypt mails
to mailing list!). If you don't know what pgp is visit www.gnupg.org.
(public pgp key: ftp.schottelius.org/pub/familiy/nico/pgp-key)