got this with my current config. Along with other misc gcc 3 warnings.

Compiling with gcc (GCC) 3.3 (Debian)

          ld -m elf_i386  -T arch/i386/vmlinux.lds.s
arch/i386/kernel/head.o arch/i386/kernel/init_task.o   init/built-in.o
--start-group  usr/built-in.o  arch/i386/kernel/built-in.o
arch/i386/mm/built-in.o  arch/i386/mach-default/built-in.o
kernel/built-in.o  mm/built-in.o  fs/built-in.o  ipc/built-in.o
security/built-in.o  crypto/built-in.o  lib/lib.a  arch/i386/lib/lib.a
drivers/built-in.o  sound/built-in.o  arch/i386/pci/built-in.o
net/built-in.o --end-group  -o vmlinux
kernel/built-in.o(.text+0x1708e): In function `free_module':
: undefined reference to `percpu_modfree'
kernel/built-in.o(.text+0x17873): In function `load_module':
: undefined reference to `find_pcpusec'
kernel/built-in.o(.text+0x179a9): In function `load_module':
: undefined reference to `percpu_modalloc'
kernel/built-in.o(.text+0x17c52): In function `load_module':
: undefined reference to `percpu_modcopy'
kernel/built-in.o(.text+0x17d3d): In function `load_module':
: undefined reference to `percpu_modfree'
make: *** [vmlinux] Error 1


i've attached my config