Error of implicit declaration`fixup_exception' in CC

  CC      arch/nios2/kernel/traps.o
/home/student/nios2-linux/linux-2.6/arch/nios2/kernel/traps.c: In function `handle_unaligned_c':
/home/student/nios2-linux/linux-2.6/arch/nios2/kernel/traps.c:144: error: implicit declaration of function `fixup_exception'
make: ***  Error 1
make: ***  Error 2
make: ***  Error 2
make: Leaving directory `/home/student/nios2-linux/linux-2.6'
make: ***  Error 1

cd /home/student/nios2-linux/uClinux-dist

trunk branch

cd /home/student/nios2-linux/linux-2.6

nios2 branch

There is no mmu model of mysystem.dts.

Could anyone help me why does the error occer here?

Kind Regards

Fdsa