Compile problems with latest GIT kernel version

[Giuseppe Sacco <giuseppe@eppesuigoccas.homedns.org>]

Hi *,
I am investigating a new problem (already reported in this list by
Martin Michlmayr) about the serial device on the SGI O2. While
recompiling the latest kernel I get this error:

make[1]: Entering directory `/usr/local/src/kernel/linux-2.6.23'
  CHK     include/linux/version.h
  CHK     include/linux/utsrelease.h
  Checking missing-syscalls for N32
  CALL    scripts/checksyscalls.sh
  Checking missing-syscalls for O32
  CALL    scripts/checksyscalls.sh
  CALL    scripts/checksyscalls.sh
  CHK     include/linux/compile.h
  CC      arch/mips/kernel/time.o
arch/mips/kernel/time.c: In function ‘mips_clockevent_init’:
arch/mips/kernel/time.c:399: error: ‘MIPS_CPU_IRQ_BASE’ undeclared (first use 
in this function)
arch/mips/kernel/time.c:399: error: (Each undeclared identifier is reported 
only once
arch/mips/kernel/time.c:399: error: for each function it appears in.)
make[2]: *** [arch/mips/kernel/time.o] Error 1
make[1]: *** [arch/mips/kernel] Error 2
make[1]: Leaving directory `/usr/local/src/kernel/linux-2.6.23'
make: *** [debian/stamp-build-kernel] Error 2

But I don't know what to do. Is this a #define missing for ip32?

Bye,
Giuseppe