How can I know what is tainting my kernel

[danielhilst@gmail.com (Daniel Hilst Selli)]

Two questions about taint system..

1. I have a installation of archlinux with kernel 3.0, just after boot I 
cat /proc/sys/kenrel/tainted and receives 1024, but cat 
/var/log/messages | grep -i taint gives me no output. How can I know 
what is tainting my kernel?

2. I was studying char devices, and have writed some code. I have put 
the MODULE_LICENSE("GPL"); on the module, build it, put it on a initrd 
image and boot with qemu using -kernel and -initrd options. When I 
loadit with modprobe I receives a message on console saying that kernel 
was tainted and /proc/sys/kernel/tainted gives me 4024. There is any 
other thing on module, besides license that can taint the kernel?

Here is the code -> http://sprunge.us/RHNa?c

[]'s