Linux for Nios: flush_dcache_page undefined error

I am running make after using gconfig to enable MTD and JFFS2 support in the kernel, and MTD utilities in the user space. Followed the directions in section 4.4.3 of the Opensource_NiosII_Linux_User_Guide.

When make is run I get the following error

ERROR: "flush_dcache_page" [fs/jffs2/jffs2.ko] undefined!

make[3]: *** [__modpost] Error 1

make[2]: *** [modules] Error 2

make[2]: *** Waiting for unfinished jobs....

UIMAGE arch/nios2/boot/vmImage

Image Name: Linux-2.6.30-00494-g84a224b

Created: Wed Nov 11 16:56:17 2009

Image Type: NIOS II Linux Kernel Image (gzip compressed)

Thought would be appreciated.

Thanks