I have some problem with cross-compiling alsa on the s3c2440;
the version of embed system kernel  is 2.6.13,and I use alsa
I put the alsa driver into the kernel tree.
When  cross-compiling ,there has error:

"sound/core/pcm.c:25:25: linux/mutex.h: No such file or directory"

and I found the kernel 2.6.13 don't have the head file mutex.h
but kernel 2.6.22 have the file,.

What should I do , I must compile the alsa under the kernel 2.6.22 or older??