Toralf Förster <toralf.foerster@gmx.de> :
[...]
> WARNING: "hdlc_close" [drivers/net/wan/dscc4.ko] undefined!
> WARNING: "hdlc_open" [drivers/net/wan/dscc4.ko] undefined!
> WARNING: "alloc_hdlcdev" [drivers/net/wan/dscc4.ko] undefined!
> WARNING: "unregister_hdlc_device" [drivers/net/wan/dscc4.ko] undefined!
> make[1]: *** [__modpost] Error 1
> make: *** [modules] Error 2

Jeff has already applied a fix for it. See:

http://www.kernel.org/git/?p=linux/kernel/git/jgarzik/netdev-2.6.git;a=commit;h=5d11e6d1657b5170d8c31d71b21995c99388dbd0

-- 
Ueimor